diff --git a/.circleci/config.yml b/.circleci/config.yml
index c1735f674f..4536865fea 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -42,4 +42,7 @@ jobs:
             - node_modules
 
       - store_artifacts:
-          path: ./node_modules.tgz
\ No newline at end of file
+          path: ./node_modules.tgz
+
+      - store_artifacts:
+          path: ./scripts/error-codes/codes.json
\ No newline at end of file
diff --git a/fixtures/attribute-behavior/package.json b/fixtures/attribute-behavior/package.json
index 69b928e56f..4149300e1b 100644
--- a/fixtures/attribute-behavior/package.json
+++ b/fixtures/attribute-behavior/package.json
@@ -12,7 +12,7 @@
   },
   "scripts": {
     "prestart":
-      "cp ../../build/dist/react.development.js public/ && cp ../../build/dist/react-dom.development.js public/ && cp ../../build/dist/react-dom-server.browser.development.js public/",
+      "cp ../../build/node_modules/react/umd/react.development.js public/ && cp ../../build/node_modules/react-dom/umd/react-dom.development.js public/ && cp ../../build/node_modules/react-dom/umd/react-dom-server.browser.development.js public/",
     "start": "react-scripts start",
     "build": "react-scripts build",
     "test": "react-scripts test --env=jsdom",
diff --git a/fixtures/dom/package.json b/fixtures/dom/package.json
index 90cb22479c..940b66736c 100644
--- a/fixtures/dom/package.json
+++ b/fixtures/dom/package.json
@@ -18,7 +18,7 @@
   },
   "scripts": {
     "start": "react-scripts start",
-    "prestart": "cp ../../build/dist/react.development.js ../../build/dist/react-dom.development.js ../../build/dist/react.production.min.js ../../build/dist/react-dom.production.min.js ../../build/dist/react-dom-server.browser.development.js ../../build/dist/react-dom-server.browser.production.min.js public/",
+    "prestart": "cp ../../build/node_modules/react/umd/react.development.js ../../build/node_modules/react-dom/umd/react-dom.development.js ../../build/node_modules/react/umd/react.production.min.js ../../build/node_modules/react-dom/umd/react-dom.production.min.js ../../build/node_modules/react-dom/umd/react-dom-server.browser.development.js ../../build/node_modules/react-dom/umd/react-dom-server.browser.production.min.js public/",
     "build": "react-scripts build && cp build/index.html build/200.html",
     "test": "react-scripts test --env=jsdom",
     "eject": "react-scripts eject"
diff --git a/fixtures/expiration/package.json b/fixtures/expiration/package.json
index 1ffb0ccbe1..263812a1ee 100644
--- a/fixtures/expiration/package.json
+++ b/fixtures/expiration/package.json
@@ -9,7 +9,7 @@
   },
   "scripts": {
     "prestart":
-      "cp ../../build/dist/react.development.js public/ && cp ../../build/dist/react-dom.development.js public/",
+      "cp ../../build/node_modules/react/umd/react.development.js public/ && cp ../../build/node_modules/react-dom/umd/react-dom.development.js public/",
     "start": "react-scripts start",
     "build": "react-scripts build",
     "test": "react-scripts test --env=jsdom",
diff --git a/fixtures/fiber-triangle/index.html b/fixtures/fiber-triangle/index.html
index 1b5941f09b..c7e22fdd43 100644
--- a/fixtures/fiber-triangle/index.html
+++ b/fixtures/fiber-triangle/index.html
@@ -16,8 +16,8 @@
         If you checked out the source from GitHub make sure to run <code>npm run build</code>.
       </p>
     </div>
-    <script src="../../build/dist/react.development.js"></script>
-    <script src="../../build/dist/react-dom.development.js"></script>
+    <script src="../../build/node_modules/react/umd/react.development.js"></script>
+    <script src="../../build/node_modules/react-dom/umd/react-dom.development.js"></script>
     <script src="https://unpkg.com/babel-standalone@6/babel.js"></script>
     <script type="text/babel">
       var dotStyle = {
diff --git a/fixtures/packaging/babel-standalone/dev.html b/fixtures/packaging/babel-standalone/dev.html
index 9c3a931bad..1e492cf73f 100644
--- a/fixtures/packaging/babel-standalone/dev.html
+++ b/fixtures/packaging/babel-standalone/dev.html
@@ -1,7 +1,7 @@
 <html>
   <body>
-    <script src="../../../build/dist/react.development.js"></script>
-    <script src="../../../build/dist/react-dom.development.js"></script>
+    <script src="../../../build/node_modules/react/umd/react.development.js"></script>
+    <script src="../../../build/node_modules/react-dom/umd/react-dom.development.js"></script>
     <script src="https://unpkg.com/babel-standalone@6/babel.js"></script>
     <div id="container"></div>
     <script type="text/babel">
diff --git a/fixtures/packaging/globals/dev.html b/fixtures/packaging/globals/dev.html
index 27dadd7e7f..8087045bfb 100644
--- a/fixtures/packaging/globals/dev.html
+++ b/fixtures/packaging/globals/dev.html
@@ -1,7 +1,7 @@
 <html>
   <body>
-    <script src="../../../build/dist/react.development.js"></script>
-    <script src="../../../build/dist/react-dom.development.js"></script>
+    <script src="../../../build/node_modules/react/umd/react.development.js"></script>
+    <script src="../../../build/node_modules/react-dom/umd/react-dom.development.js"></script>
     <div id="container"></div>
     <script>
       ReactDOM.render(
diff --git a/fixtures/packaging/globals/prod.html b/fixtures/packaging/globals/prod.html
index 8ce10fa281..f19d5fc306 100644
--- a/fixtures/packaging/globals/prod.html
+++ b/fixtures/packaging/globals/prod.html
@@ -1,7 +1,7 @@
 <html>
   <body>
-    <script src="../../../build/dist/react.production.min.js"></script>
-    <script src="../../../build/dist/react-dom.production.min.js"></script>
+    <script src="../../../build/node_modules/react/umd/react.production.min.js"></script>
+    <script src="../../../build/node_modules/react-dom/umd/react-dom.production.min.js"></script>
     <div id="container"></div>
     <script>
       ReactDOM.render(
diff --git a/fixtures/packaging/requirejs/dev.html b/fixtures/packaging/requirejs/dev.html
index 498afd7824..cdce9ca954 100644
--- a/fixtures/packaging/requirejs/dev.html
+++ b/fixtures/packaging/requirejs/dev.html
@@ -5,8 +5,8 @@
     <script>
       requirejs.config({
         paths: {
-          react: '../../../build/dist/react.development',
-          'react-dom': '../../../build/dist/react-dom.development'
+          react: '../../../build/node_modules/react/umd/react.development',
+          'react-dom': '../../../build/node_modules/react-dom/umd/react-dom.development'
         }
       });
 
diff --git a/fixtures/packaging/requirejs/prod.html b/fixtures/packaging/requirejs/prod.html
index 9b64260fc2..85fcfc21ac 100644
--- a/fixtures/packaging/requirejs/prod.html
+++ b/fixtures/packaging/requirejs/prod.html
@@ -5,8 +5,8 @@
     <script>
       requirejs.config({
         paths: {
-          react: '../../../build/dist/react.production.min',
-          'react-dom': '../../../build/dist/react-dom.production.min'
+          react: '../../../build/node_modules/react/umd/react.production.min',
+          'react-dom': '../../../build/node_modules/react-dom/umd/react-dom.production.min'
         }
       });
 
diff --git a/fixtures/packaging/rjs/dev/config.js b/fixtures/packaging/rjs/dev/config.js
index b5f82be26a..6c505d130f 100644
--- a/fixtures/packaging/rjs/dev/config.js
+++ b/fixtures/packaging/rjs/dev/config.js
@@ -4,8 +4,9 @@ module.exports = {
   out: 'output.js',
   optimize: 'none',
   paths: {
-    react: '../../../../build/dist/react.development',
-    'react-dom': '../../../../build/dist/react-dom.development',
+    react: '../../../../build/node_modules/react/umd/react.development',
+    'react-dom':
+      '../../../../build/node_modules/react-dom/umd/react-dom.development',
     schedule: '../../../../build/dist/schedule.development',
   },
 };
diff --git a/fixtures/packaging/rjs/prod/config.js b/fixtures/packaging/rjs/prod/config.js
index 044a43c785..a2d28d16b3 100644
--- a/fixtures/packaging/rjs/prod/config.js
+++ b/fixtures/packaging/rjs/prod/config.js
@@ -4,8 +4,9 @@ module.exports = {
   out: 'output.js',
   optimize: 'none',
   paths: {
-    react: '../../../../build/dist/react.production.min',
-    'react-dom': '../../../../build/dist/react-dom.production.min',
+    react: '../../../../build/node_modules/react/umd/react.production.min',
+    'react-dom':
+      '../../../../build/node_modules/react-dom/umd/react-dom.production.min',
     schedule: '../../../../build/dist/schedule.development',
   },
 };
diff --git a/fixtures/packaging/systemjs-builder/dev/config.js b/fixtures/packaging/systemjs-builder/dev/config.js
index c1a72905d2..de6bd6f442 100644
--- a/fixtures/packaging/systemjs-builder/dev/config.js
+++ b/fixtures/packaging/systemjs-builder/dev/config.js
@@ -1,7 +1,8 @@
 System.config({
   paths: {
-    react: '../../../../build/dist/react.development.js',
-    'react-dom': '../../../../build/dist/react-dom.development.js',
+    react: '../../../../build/node_modules/react/umd/react.development.js',
+    'react-dom':
+      '../../../../build/node_modules/react-dom/umd/react-dom.development.js',
     schedule: '../../../../build/dist/schedule.development',
   },
 });
diff --git a/fixtures/packaging/systemjs-builder/prod/config.js b/fixtures/packaging/systemjs-builder/prod/config.js
index 4b7127c002..531995f051 100644
--- a/fixtures/packaging/systemjs-builder/prod/config.js
+++ b/fixtures/packaging/systemjs-builder/prod/config.js
@@ -1,7 +1,8 @@
 System.config({
   paths: {
-    react: '../../../../build/dist/react.production.min.js',
-    'react-dom': '../../../../build/dist/react-dom.production.min.js',
+    react: '../../../../build/node_modules/react/umd/react.production.min.js',
+    'react-dom':
+      '../../../../build/node_modules/react-dom/umd/react-dom.production.min.js',
     schedule: '../../../../build/dist/schedule.development',
   },
 });
diff --git a/fixtures/packaging/systemjs/dev.html b/fixtures/packaging/systemjs/dev.html
index 389a201cad..752cf04613 100644
--- a/fixtures/packaging/systemjs/dev.html
+++ b/fixtures/packaging/systemjs/dev.html
@@ -5,8 +5,8 @@
     <script>
       System.config({
         paths: {
-          react: '../../../build/dist/react.development.js',
-          'react-dom': '../../../build/dist/react-dom.development.js'
+          react: '../../../build/node_modules/react/umd/react.development.js',
+          'react-dom': '../../../build/node_modules/react-dom/umd/react-dom.development.js'
         }
       });
 
diff --git a/fixtures/packaging/systemjs/prod.html b/fixtures/packaging/systemjs/prod.html
index 848fb767b1..ed0362ed06 100644
--- a/fixtures/packaging/systemjs/prod.html
+++ b/fixtures/packaging/systemjs/prod.html
@@ -5,8 +5,8 @@
     <script>
       System.config({
         paths: {
-          react: '../../../build/dist/react.production.min.js',
-          'react-dom': '../../../build/dist/react-dom.production.min.js'
+          react: '../../../build/node_modules/react/umd/react.production.min.js',
+          'react-dom': '../../../build/node_modules/react-dom/umd/react-dom.production.min.js'
         }
       });
 
diff --git a/fixtures/scheduler/index.html b/fixtures/scheduler/index.html
index c941f2f246..bdf1ffe009 100644
--- a/fixtures/scheduler/index.html
+++ b/fixtures/scheduler/index.html
@@ -91,7 +91,7 @@
       <div> If the counter advanced while you were away from this tab, it's correct.</div>
     </li>
   </ol>
-  <script src="../../build/dist/react.development.js"></script>
+  <script src="../../build/node_modules/react/umd/react.development.js"></script>
   <script src="../../build/node_modules/scheduler/umd/scheduler.development.js"></script>
   <script src="https://unpkg.com/babel-standalone@6/babel.js"></script>
   <script type="text/babel">
diff --git a/package.json b/package.json
index 9f3d3d0970..f6829548c0 100644
--- a/package.json
+++ b/package.json
@@ -93,7 +93,7 @@
     "testRegex": "/scripts/jest/dont-run-jest-directly\\.js$"
   },
   "scripts": {
-    "build": "npm run version-check && node ./scripts/rollup/build.js",
+    "build": "node ./scripts/rollup/build.js",
     "linc": "node ./scripts/tasks/linc.js",
     "lint": "node ./scripts/tasks/eslint.js",
     "lint-build": "node ./scripts/rollup/validate/index.js",
diff --git a/packages/create-subscription/package.json b/packages/create-subscription/package.json
index b28cd18dd8..31f4c2b7d8 100644
--- a/packages/create-subscription/package.json
+++ b/packages/create-subscription/package.json
@@ -6,6 +6,7 @@
   "files": [
     "LICENSE",
     "README.md",
+    "build-info.json",
     "index.js",
     "cjs/"
   ],
diff --git a/packages/eslint-plugin-react-hooks/package.json b/packages/eslint-plugin-react-hooks/package.json
index 598758798f..efac100e7e 100644
--- a/packages/eslint-plugin-react-hooks/package.json
+++ b/packages/eslint-plugin-react-hooks/package.json
@@ -7,6 +7,7 @@
   "files": [
     "LICENSE",
     "README.md",
+    "build-info.json",
     "index.js",
     "cjs"
   ],
diff --git a/packages/jest-react/package.json b/packages/jest-react/package.json
index dc5cf76d0d..d060436685 100644
--- a/packages/jest-react/package.json
+++ b/packages/jest-react/package.json
@@ -22,6 +22,7 @@
   "files": [
     "LICENSE",
     "README.md",
+    "build-info.json",
     "index.js",
     "cjs/"
   ]
diff --git a/packages/react-art/package.json b/packages/react-art/package.json
index 02a6085463..32db7ca763 100644
--- a/packages/react-art/package.json
+++ b/packages/react-art/package.json
@@ -31,6 +31,7 @@
   "files": [
     "LICENSE",
     "README.md",
+    "build-info.json",
     "index.js",
     "cjs/",
     "umd/",
diff --git a/packages/react-cache/package.json b/packages/react-cache/package.json
index b608fb3128..d31f140c42 100644
--- a/packages/react-cache/package.json
+++ b/packages/react-cache/package.json
@@ -7,6 +7,7 @@
   "files": [
     "LICENSE",
     "README.md",
+    "build-info.json",
     "index.js",
     "cjs/",
     "umd/"
diff --git a/packages/react-debug-tools/package.json b/packages/react-debug-tools/package.json
index ea013d1aba..405705dde5 100644
--- a/packages/react-debug-tools/package.json
+++ b/packages/react-debug-tools/package.json
@@ -12,6 +12,7 @@
   "files": [
     "LICENSE",
     "README.md",
+    "build-info.json",
     "index.js",
     "cjs/"
   ],
diff --git a/packages/react-dom/package.json b/packages/react-dom/package.json
index 0900718323..d92c95f7d3 100644
--- a/packages/react-dom/package.json
+++ b/packages/react-dom/package.json
@@ -24,6 +24,7 @@
   "files": [
     "LICENSE",
     "README.md",
+    "build-info.json",
     "index.js",
     "profiling.js",
     "server.js",
diff --git a/packages/react-is/package.json b/packages/react-is/package.json
index 5ff1d68029..70db5a95ad 100644
--- a/packages/react-is/package.json
+++ b/packages/react-is/package.json
@@ -15,6 +15,7 @@
   "files": [
     "LICENSE",
     "README.md",
+    "build-info.json",
     "index.js",
     "cjs/",
     "umd/"
diff --git a/packages/react-noop-renderer/package.json b/packages/react-noop-renderer/package.json
index 22f5d5d8f9..51b668a366 100644
--- a/packages/react-noop-renderer/package.json
+++ b/packages/react-noop-renderer/package.json
@@ -18,6 +18,7 @@
   "files": [
     "LICENSE",
     "README.md",
+    "build-info.json",
     "index.js",
     "persistent.js",
     "cjs/"
diff --git a/packages/react-reconciler/package.json b/packages/react-reconciler/package.json
index 1d4bbe9416..906a58ed40 100644
--- a/packages/react-reconciler/package.json
+++ b/packages/react-reconciler/package.json
@@ -11,6 +11,7 @@
   "files": [
     "LICENSE",
     "README.md",
+    "build-info.json",
     "index.js",
     "persistent.js",
     "reflection.js",
diff --git a/packages/react-test-renderer/package.json b/packages/react-test-renderer/package.json
index 2525b17a43..6012653435 100644
--- a/packages/react-test-renderer/package.json
+++ b/packages/react-test-renderer/package.json
@@ -26,6 +26,7 @@
   "files": [
     "LICENSE",
     "README.md",
+    "build-info.json",
     "index.js",
     "shallow.js",
     "cjs/",
diff --git a/packages/react/package.json b/packages/react/package.json
index 7c59904062..623b1d1808 100644
--- a/packages/react/package.json
+++ b/packages/react/package.json
@@ -11,6 +11,7 @@
   "files": [
     "LICENSE",
     "README.md",
+    "build-info.json",
     "index.js",
     "cjs/",
     "umd/"
diff --git a/packages/scheduler/package.json b/packages/scheduler/package.json
index 380a3c8e92..cbba2e8879 100644
--- a/packages/scheduler/package.json
+++ b/packages/scheduler/package.json
@@ -19,6 +19,7 @@
   "files": [
     "LICENSE",
     "README.md",
+    "build-info.json",
     "index.js",
     "tracing.js",
     "tracing-profiling.js",
diff --git a/scripts/circleci/add_build_info_json.sh b/scripts/circleci/add_build_info_json.sh
new file mode 100755
index 0000000000..122d859535
--- /dev/null
+++ b/scripts/circleci/add_build_info_json.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+set -e
+
+node ./scripts/release/ci-add-build-info-json.js
diff --git a/scripts/circleci/test_entry_point.sh b/scripts/circleci/test_entry_point.sh
index c452eebc00..5b46ec45d3 100755
--- a/scripts/circleci/test_entry_point.sh
+++ b/scripts/circleci/test_entry_point.sh
@@ -25,6 +25,8 @@ if [ $((1 % CIRCLE_NODE_TOTAL)) -eq "$CIRCLE_NODE_INDEX" ]; then
 fi
 
 if [ $((2 % CIRCLE_NODE_TOTAL)) -eq "$CIRCLE_NODE_INDEX" ]; then
+  COMMANDS_TO_RUN+=('./scripts/circleci/add_build_info_json.sh')
+  COMMANDS_TO_RUN+=('./scripts/circleci/update_package_versions.sh')
   COMMANDS_TO_RUN+=('./scripts/circleci/build.sh')
   COMMANDS_TO_RUN+=('yarn test-build --maxWorkers=2')
   COMMANDS_TO_RUN+=('yarn test-build-prod --maxWorkers=2')
diff --git a/scripts/circleci/update_package_versions.sh b/scripts/circleci/update_package_versions.sh
new file mode 100755
index 0000000000..3661e80cde
--- /dev/null
+++ b/scripts/circleci/update_package_versions.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+set -e
+
+node ./scripts/release/ci-update-package-versions.js
diff --git a/scripts/release/README.md b/scripts/release/README.md
index 0ea523e98b..00b80e7873 100644
--- a/scripts/release/README.md
+++ b/scripts/release/README.md
@@ -1,13 +1,66 @@
 # React Release Scripts
 
-At a high-level, the release process uses two scripts: **build** and **publish**.
-1. The **build** script does the heavy lifting (e.g., checking CI, running automated tests, building Rollup bundles) and then prints instructions for manual verification.
-1. The **publish** script then publishes the built artifacts to npm and pushes to GitHub.
+The release process consists of several phases, each one represented by one of the scripts below.
 
-Run either script without parameters to see its usage, e.g.:
-```
-./scripts/release/build.js
-./scripts/release/publish.js
+A typical release goes like this:
+1. When a commit is pushed to the React repo, [Circle CI](https://circleci.com/gh/facebook/react/) will build all release bundles and run unit tests against both the source code and the built bundles.
+2. Next the release is published as a canary using the [`prepare-canary`](#prepare-canary) and [`publish`](#publish) scripts. (Currently this process is manual but might be automated in the future using [GitHub "actions"](https://github.com/features/actions).)
+3. Finally, a canary releases can be promoted to stable using the [`prepare-stable`](#prepare-stable) and [`publish`](#publish) scripts. (This process is always manual.)
+
+One or more release scripts are used for each of the above phases. Learn more about these scripts below:
+* [`create-canary`](#create-canary)
+* [`prepare-canary`](#prepare-canary)
+* [`prepare-stable`](#prepare-stable)
+* [`publish`](#publish)
+
+## `create-canary`
+Creates a canary build from the current (local) Git revision.
+
+**This script is an escape hatch.** It allows a canary release to be created without pushing a commit to be verified by Circle CI. **It does not run any automated unit tests.** Testing is solely the responsibility of the release engineer.
+
+Note that this script git-archives the React repo (at the current revision) to a temporary directory before building, so **uncommitted changes are not included in the build**.
+
+#### Example usage
+To create a canary from the current branch and revision:
+```sh
+scripts/release/create-canary.js
 ```
 
-Each script will guide the release engineer through any necessary steps (including environment setup and manual testing steps).
+## `prepare-canary`
+Downloads build artifacts from Circle CI in preparation to be published to NPM as a canary release.
+
+All artifacts built by Circle CI have already been unit-tested (both source and bundles) but canaries should **always be manually tested** before being published. Upon completion, this script prints manual testing instructions.
+
+#### Example usage
+To prepare the artifacts created by [Circle CI build 12677](https://circleci.com/gh/facebook/react/12677#artifacts/containers/0) you would run:
+```sh
+scripts/release/prepare-canary.js --build=12677
+```
+
+## `prepare-stable`
+Checks out a canary release from NPM and prepares it to be published as a stable release.
+
+This script prompts for new (stable) release versions for each public package and updates the package contents (both `package.json` and inline version numbers) to match. It also updates inter-package dependencies to account for the new versions.
+
+Canary release have already been tested but it is still a good idea to **manually test and verify a release** before publishing to ensure that e.g. version numbers are correct. Upon completion, this script prints manual testing instructions.
+
+#### Example usage
+To promote the canary release `0.0.0-5bf84d292` (aka commit [5bf84d292](https://github.com/facebook/react/commit/5bf84d292)) to stable:
+```sh
+scripts/release/prepare-stable.js --version=0.0.0-5bf84d292
+```
+
+## `publish`
+Publishes the current contents of `build/node_modules` to NPM.
+
+This script publishes each public package to NPM and updates the specified tag(s) to match. **It does not test or verify the local package contents before publishing**. This should be done by the release engineer prior to running the script.
+
+Upon completion, this script provides instructions for tagging the Git commit that the package was created from and updating the release CHANGELOG.
+
+**Specify a `--dry` flag when running this script if you want to skip the NPM-publish step.** In this event, the script will print the NPM commands but it will not actually run them.
+
+#### Example usage
+To publish a release to NPM as both `next` and `latest`:
+```sh
+scripts/release/publish.js --tags next latest
+```
\ No newline at end of file
diff --git a/scripts/release/build-commands/add-git-tag.js b/scripts/release/build-commands/add-git-tag.js
deleted file mode 100644
index 1606b74c33..0000000000
--- a/scripts/release/build-commands/add-git-tag.js
+++ /dev/null
@@ -1,23 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const chalk = require('chalk');
-const {execUnlessDry, logPromise} = require('../utils');
-
-const run = async ({cwd, dry, version}) => {
-  await execUnlessDry(
-    `git tag -a v${version} -m "Tagging ${version} release"`,
-    {
-      cwd,
-      dry,
-    }
-  );
-};
-
-module.exports = async ({cwd, dry, version}) => {
-  return logPromise(
-    run({cwd, dry, version}),
-    `Creating git tag ${chalk.yellow.bold(`v${version}`)}`
-  );
-};
diff --git a/scripts/release/build-commands/build-artifacts.js b/scripts/release/build-commands/build-artifacts.js
deleted file mode 100644
index 8687c90d40..0000000000
--- a/scripts/release/build-commands/build-artifacts.js
+++ /dev/null
@@ -1,32 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const {exec} = require('child-process-promise');
-const {execRead, execUnlessDry, logPromise} = require('../utils');
-
-const run = async ({cwd, dry, version}) => {
-  await exec('yarn build -- --extract-errors', {cwd});
-
-  const modifiedFiles = await execRead('git ls-files -m', {cwd});
-
-  if (modifiedFiles.includes('scripts/error-codes/codes.json')) {
-    await execUnlessDry('git add scripts/error-codes/codes.json', {cwd, dry});
-    await execUnlessDry(
-      `git commit -m "Update error codes for ${version} release"`,
-      {cwd, dry}
-    );
-  }
-
-  if (modifiedFiles.includes('scripts/rollup/results.json')) {
-    await execUnlessDry('git add scripts/rollup/results.json', {cwd, dry});
-    await execUnlessDry(
-      `git commit -m "Update bundle sizes for ${version} release"`,
-      {cwd, dry}
-    );
-  }
-};
-
-module.exports = async params => {
-  return logPromise(run(params), 'Building artifacts', true);
-};
diff --git a/scripts/release/build-commands/check-circle-ci-status.js b/scripts/release/build-commands/check-circle-ci-status.js
deleted file mode 100644
index 5c5348906a..0000000000
--- a/scripts/release/build-commands/check-circle-ci-status.js
+++ /dev/null
@@ -1,70 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const chalk = require('chalk');
-const http = require('request-promise-json');
-const logUpdate = require('log-update');
-const prompt = require('prompt-promise');
-const {execRead, logPromise} = require('../utils');
-
-// https://circleci.com/docs/api/v1-reference/#projects
-const CIRCLE_CI_BASE_URL =
-  'https://circleci.com/api/v1.1/project/github/facebook/react/tree/master';
-
-const check = async ({cwd}) => {
-  const token = process.env.CIRCLE_CI_API_TOKEN;
-  const uri = `${CIRCLE_CI_BASE_URL}?circle-token=${token}&limit=1`;
-
-  const response = await http.get(uri, true);
-  const {outcome, status, vcs_revision: ciRevision} = response[0];
-
-  const gitRevision = await execRead('git rev-parse HEAD', {cwd});
-
-  if (gitRevision !== ciRevision) {
-    throw Error(
-      chalk`
-      CircleCI is stale
-
-      {white The latest Git revision is {yellow.bold ${gitRevision}}}
-      {white The most recent CircleCI revision is {yellow.bold ${ciRevision}}}
-      {white Please wait for CircleCI to catch up.}
-    `
-    );
-  } else if (outcome !== 'success') {
-    throw Error(
-      chalk`
-      CircleCI failed
-      
-      {white The most recent CircleCI build has a status of {red.bold ${outcome ||
-        status}}}
-      {white Please retry this build in CircleCI if you believe this is an error.}
-    `
-    );
-  }
-};
-
-module.exports = async params => {
-  if (params.local) {
-    return;
-  }
-
-  if (params.skipCI) {
-    logUpdate(
-      chalk.red`Are you sure you want to skip CI? (y for yes, n for no)`
-    );
-    const confirm = await prompt('');
-    logUpdate.done();
-    if (confirm === 'y') {
-      return;
-    } else {
-      throw Error(
-        chalk`
-        Cancelling release.
-      `
-      );
-    }
-  }
-
-  return logPromise(check(params), 'Checking CircleCI status');
-};
diff --git a/scripts/release/build-commands/check-environment-variables.js b/scripts/release/build-commands/check-environment-variables.js
deleted file mode 100644
index a4318a5fa3..0000000000
--- a/scripts/release/build-commands/check-environment-variables.js
+++ /dev/null
@@ -1,27 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const chalk = require('chalk');
-
-module.exports = () => {
-  if (!process.env.CIRCLE_CI_API_TOKEN) {
-    throw Error(
-      chalk`
-      {red Missing CircleCI API token}
-
-      {white The CircleCI API is used to check the status of the latest commit.}
-      {white This API requires a token which must be exposed via a {yellow.bold CIRCLE_CI_API_TOKEN} environment var.}
-      {white In order to run this script you will need to create your own API token.}
-      {white Instructions can be found at:}
-
-      {blue.bold https://circleci.com/docs/api/v1-reference/#getting-started}
-
-      {white To make this token available to the release script, add it to your {yellow.bold .bash_profile} like so:}
-
-      {gray # React release script}
-      {white export CIRCLE_CI_API_TOKEN=<your-token-here>}
-    `
-    );
-  }
-};
diff --git a/scripts/release/build-commands/check-package-dependencies.js b/scripts/release/build-commands/check-package-dependencies.js
deleted file mode 100644
index fe9a532996..0000000000
--- a/scripts/release/build-commands/check-package-dependencies.js
+++ /dev/null
@@ -1,60 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const chalk = require('chalk');
-const {readJson} = require('fs-extra');
-const {join} = require('path');
-const {dependencies} = require('../config');
-const {logPromise} = require('../utils');
-
-const check = async ({cwd, packages}) => {
-  const rootPackage = await readJson(join(cwd, 'package.json'));
-
-  const projectPackages = [];
-  for (let i = 0; i < packages.length; i++) {
-    const project = packages[i];
-    projectPackages.push(
-      await readJson(join(cwd, join('packages', project), 'package.json'))
-    );
-  }
-
-  const invalidDependencies = [];
-
-  const checkModule = module => {
-    const rootVersion = rootPackage.devDependencies[module];
-
-    projectPackages.forEach(projectPackage => {
-      // Not all packages have dependencies (eg react-is)
-      const projectVersion = projectPackage.dependencies
-        ? projectPackage.dependencies[module]
-        : undefined;
-
-      if (rootVersion !== projectVersion && projectVersion !== undefined) {
-        invalidDependencies.push(
-          `${module} is ${chalk.red.bold(rootVersion)} in root but ` +
-            `${chalk.red.bold(projectVersion)} in ${projectPackage.name}`
-        );
-      }
-    });
-  };
-
-  dependencies.forEach(checkModule);
-
-  if (invalidDependencies.length) {
-    throw Error(
-      chalk`
-      Dependency mismatch
-
-      {white The following dependencies do not match between the root package and NPM dependencies:}
-      ${invalidDependencies
-        .map(dependency => chalk.white(dependency))
-        .join('\n')}
-    `
-    );
-  }
-};
-
-module.exports = async params => {
-  return logPromise(check(params), 'Checking runtime dependencies');
-};
diff --git a/scripts/release/build-commands/check-uncommitted-changes.js b/scripts/release/build-commands/check-uncommitted-changes.js
deleted file mode 100644
index 4d18e889b5..0000000000
--- a/scripts/release/build-commands/check-uncommitted-changes.js
+++ /dev/null
@@ -1,20 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const chalk = require('chalk');
-const {execRead} = require('../utils');
-
-module.exports = async ({cwd}) => {
-  const status = await execRead('git diff HEAD', {cwd});
-
-  if (status) {
-    throw Error(
-      chalk`
-      Uncommitted local changes
-
-      {white Please revert or commit all local changes before making a release.}
-    `
-    );
-  }
-};
diff --git a/scripts/release/build-commands/install-yarn-dependencies.js b/scripts/release/build-commands/install-yarn-dependencies.js
deleted file mode 100644
index f0771552cf..0000000000
--- a/scripts/release/build-commands/install-yarn-dependencies.js
+++ /dev/null
@@ -1,15 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const {exec} = require('child-process-promise');
-const {logPromise} = require('../utils');
-
-const install = async ({cwd}) => {
-  await exec('rm -rf node_modules', {cwd});
-  await exec('yarn', {cwd});
-};
-
-module.exports = async ({cwd}) => {
-  return logPromise(install({cwd}), 'Installing NPM dependencies');
-};
diff --git a/scripts/release/build-commands/parse-build-parameters.js b/scripts/release/build-commands/parse-build-parameters.js
deleted file mode 100644
index 4ff12e1487..0000000000
--- a/scripts/release/build-commands/parse-build-parameters.js
+++ /dev/null
@@ -1,57 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const chalk = require('chalk');
-const commandLineArgs = require('command-line-args');
-const commandLineUsage = require('command-line-usage');
-const figlet = require('figlet');
-const {paramDefinitions} = require('../config');
-
-module.exports = () => {
-  const params = commandLineArgs(paramDefinitions);
-
-  if (!params.version) {
-    const usage = commandLineUsage([
-      {
-        content: chalk
-          .hex('#61dafb')
-          .bold(figlet.textSync('react', {font: 'Graffiti'})),
-        raw: true,
-      },
-      {
-        content: 'Automated pre-release build script.',
-      },
-      {
-        header: 'Options',
-        optionList: paramDefinitions,
-      },
-      {
-        header: 'Examples',
-        content: [
-          {
-            desc: '1. A concise example.',
-            example: '$ ./build.js [bold]{-v} [underline]{16.0.0}',
-          },
-          {
-            desc: '2. Dry run build a release candidate (no git commits).',
-            example:
-              '$ ./build.js [bold]{--dry} [bold]{-v} [underline]{16.0.0-rc.0}',
-          },
-          {
-            desc: '3. Release from another checkout.',
-            example:
-              '$ ./build.js [bold]{--version}=[underline]{16.0.0} [bold]{--path}=/path/to/react/repo',
-          },
-        ],
-      },
-    ]);
-    console.log(usage);
-    process.exit(1);
-  }
-
-  return {
-    ...params,
-    cwd: params.path, // For script convenience
-  };
-};
diff --git a/scripts/release/build-commands/print-post-build-summary.js b/scripts/release/build-commands/print-post-build-summary.js
deleted file mode 100644
index a9c660d0c5..0000000000
--- a/scripts/release/build-commands/print-post-build-summary.js
+++ /dev/null
@@ -1,55 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const chalk = require('chalk');
-const {join, relative} = require('path');
-const {getUnexecutedCommands} = require('../utils');
-
-const CHANGELOG_PATH =
-  'https://github.com/facebook/react/edit/master/CHANGELOG.md';
-
-module.exports = ({cwd, dry, path, version}) => {
-  const publishPath = relative(
-    process.env.PWD,
-    join(__dirname, '../publish.js')
-  );
-  const command =
-    `${publishPath} -v ${version}` +
-    (path ? ` -p ${path}` : '') +
-    (dry ? ' --dry' : '');
-
-  const packagingFixturesPath = join(cwd, 'fixtures/packaging');
-  const standaloneFixturePath = join(
-    cwd,
-    'fixtures/packaging/babel-standalone/dev.html'
-  );
-
-  console.log(
-    chalk`
-    {green.bold Build successful!}
-    ${getUnexecutedCommands()}
-    Next there are a couple of manual steps:
-
-    {bold.underline Step 1: Update the CHANGELOG}
-
-    Here are a few things to keep in mind:
-    • The changes should be easy to understand. (Friendly one-liners are better than PR titles.)
-    • Make sure all contributors are credited.
-    • Verify that the markup is valid by previewing it in the editor: {blue.bold ${CHANGELOG_PATH}}
-
-    {bold.underline Step 2: Smoke test the packages}
-
-    1. Open {yellow.bold ${standaloneFixturePath}} in the browser.
-    2. It should say {italic "Hello world!"}
-    3. Next go to {yellow.bold ${packagingFixturesPath}} and run {bold node build-all.js}
-    4. Install the "serve" module ({bold npm install -g serve})
-    5. Go to the repo root and {bold serve -s .}
-    6. Open {blue.bold http://localhost:5000/fixtures/packaging}
-    7. Verify every iframe shows {italic "Hello world!"}
-
-    After completing the above steps, resume the release process by running:
-    {yellow.bold ${command}}
-  `.replace(/\n +/g, '\n')
-  );
-};
diff --git a/scripts/release/build-commands/run-automated-bundle-tests.js b/scripts/release/build-commands/run-automated-bundle-tests.js
deleted file mode 100644
index 3fed6b3002..0000000000
--- a/scripts/release/build-commands/run-automated-bundle-tests.js
+++ /dev/null
@@ -1,30 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const {logPromise, runYarnTask} = require('../utils');
-
-module.exports = async ({cwd}) => {
-  await logPromise(
-    runYarnTask(cwd, 'lint-build', 'Lint bundle failed'),
-    'Running ESLint on bundle'
-  );
-  await logPromise(
-    runYarnTask(
-      cwd,
-      'test-build',
-      'Jest tests on the bundle failed in development'
-    ),
-    'Running Jest tests on the bundle in the development environment',
-    true
-  );
-  await logPromise(
-    runYarnTask(
-      cwd,
-      'test-build-prod',
-      'Jest tests on the bundle failed in production'
-    ),
-    'Running Jest tests on the bundle in the production environment',
-    true
-  );
-};
diff --git a/scripts/release/build-commands/run-automated-tests.js b/scripts/release/build-commands/run-automated-tests.js
deleted file mode 100644
index da1f6ad08b..0000000000
--- a/scripts/release/build-commands/run-automated-tests.js
+++ /dev/null
@@ -1,23 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const {logPromise, runYarnTask} = require('../utils');
-
-module.exports = async ({cwd}) => {
-  await logPromise(runYarnTask(cwd, 'lint', 'Lint failed'), 'Running ESLint');
-  await logPromise(
-    runYarnTask(cwd, 'flow-ci', 'Flow failed'),
-    'Running Flow checks'
-  );
-  await logPromise(
-    runYarnTask(cwd, 'test', 'Jest tests failed in development'),
-    'Running Jest tests in the development environment',
-    true
-  );
-  await logPromise(
-    runYarnTask(cwd, 'test-prod', 'Jest tests failed in production'),
-    'Running Jest tests in the production environment',
-    true
-  );
-};
diff --git a/scripts/release/build-commands/update-git.js b/scripts/release/build-commands/update-git.js
deleted file mode 100644
index 163111f09a..0000000000
--- a/scripts/release/build-commands/update-git.js
+++ /dev/null
@@ -1,26 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const chalk = require('chalk');
-const {exec} = require('child-process-promise');
-const {logPromise} = require('../utils');
-
-const update = async ({cwd, branch, local}) => {
-  if (!local) {
-    await exec('git fetch', {cwd});
-  }
-  await exec(`git checkout ${branch}`, {cwd});
-  if (!local) {
-    await exec('git pull', {cwd});
-  }
-};
-
-module.exports = async params => {
-  return logPromise(
-    update(params),
-    `Updating checkout ${chalk.yellow.bold(
-      params.cwd
-    )} on branch ${chalk.yellow.bold(params.branch)}`
-  );
-};
diff --git a/scripts/release/build-commands/update-noop-renderer-dependencies.js b/scripts/release/build-commands/update-noop-renderer-dependencies.js
deleted file mode 100644
index e0bee71961..0000000000
--- a/scripts/release/build-commands/update-noop-renderer-dependencies.js
+++ /dev/null
@@ -1,47 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const {readJson, writeJson} = require('fs-extra');
-const {join} = require('path');
-const semver = require('semver');
-const {execRead, execUnlessDry, logPromise} = require('../utils');
-
-const getReactReconcilerVersion = async cwd => {
-  const path = join(cwd, 'packages', 'react-reconciler', 'package.json');
-  const json = await readJson(path);
-  return json.version;
-};
-
-const update = async ({cwd, dry}) => {
-  const path = join(cwd, 'packages', 'react-noop-renderer', 'package.json');
-  const json = await readJson(path);
-
-  // IMPORTANT: This script must be run after update-package-versions,
-  // Since it depends up the updated react-reconciler version.
-  const reconcilerVersion = await getReactReconcilerVersion(cwd);
-
-  // There is no wildcard for semver that includes prerelease ranges as well.
-  // This causes problems for our Yarn workspaces setup,
-  // Since the noop-renderer depends on react-reconciler.
-  // So we have a special case check for this that ensures semver compatibility.
-  if (semver.prerelease(reconcilerVersion)) {
-    json.dependencies['react-reconciler'] = `* || ${reconcilerVersion}`;
-  } else {
-    json.dependencies['react-reconciler'] = '*';
-  }
-
-  await writeJson(path, json, {spaces: 2});
-
-  const status = await execRead('git status -s', {cwd});
-  if (status) {
-    await execUnlessDry(
-      `git commit -am "Updating dependencies for react-noop-renderer"`,
-      {cwd, dry}
-    );
-  }
-};
-
-module.exports = async params => {
-  return logPromise(update(params), 'Updating noop renderer dependencies');
-};
diff --git a/scripts/release/build-commands/update-package-versions.js b/scripts/release/build-commands/update-package-versions.js
deleted file mode 100644
index 467c20791b..0000000000
--- a/scripts/release/build-commands/update-package-versions.js
+++ /dev/null
@@ -1,153 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const chalk = require('chalk');
-const {exec} = require('child-process-promise');
-const {readFileSync, writeFileSync} = require('fs');
-const {readJson, writeJson} = require('fs-extra');
-const {join} = require('path');
-const semver = require('semver');
-const {execUnlessDry, logPromise} = require('../utils');
-
-const getNextVersion = (prevVersion, releaseVersion) => {
-  const prerelease = semver.prerelease(releaseVersion);
-
-  // Unstable packages (eg version < 1.0) are treated specially:
-  // Rather than use the release version (eg 16.1.0)-
-  // We just auto-increment the minor version (eg 0.1.0 -> 0.2.0).
-  // If we're doing a prerelease, we also append the suffix (eg 0.2.0-beta).
-  if (semver.lt(prevVersion, '1.0.0')) {
-    let suffix = '';
-    if (prerelease) {
-      suffix = `-${prerelease.join('.')}`;
-    }
-
-    // If this is a new pre-release, increment the minor.
-    // Else just increment (or remove) the pre-release suffix.
-    // This way our minor version isn't incremented unnecessarily with each prerelease.
-    const minor = semver.prerelease(prevVersion)
-      ? semver.minor(prevVersion)
-      : semver.minor(prevVersion) + 1;
-
-    return `0.${minor}.0${suffix}`;
-  } else {
-    return releaseVersion;
-  }
-};
-
-const update = async ({cwd, dry, packages, version}) => {
-  try {
-    // Update root package.json
-    const packagePath = join(cwd, 'package.json');
-    const rootPackage = await readJson(packagePath);
-    rootPackage.version = version;
-    await writeJson(packagePath, rootPackage, {spaces: 2});
-
-    // Update ReactVersion source file
-    const reactVersionPath = join(cwd, 'packages/shared/ReactVersion.js');
-    const reactVersion = readFileSync(reactVersionPath, 'utf8').replace(
-      /module\.exports = '[^']+';/,
-      `module.exports = '${version}';`
-    );
-    writeFileSync(reactVersionPath, reactVersion);
-
-    // Update renderer versions and peer dependencies
-    const updateProjectPackage = async project => {
-      const path = join(cwd, 'packages', project, 'package.json');
-      const json = await readJson(path);
-      const prerelease = semver.prerelease(version);
-
-      // If this is a package we publish directly to NPM, update its version.
-      // Skip ones that we don't directly publish though (e.g. react-native-renderer).
-      if (json.private !== true) {
-        json.version = getNextVersion(json.version, version);
-      }
-
-      if (project === 'react') {
-        // Update inter-package dependencies as well.
-        // e.g. react depends on scheduler
-        if (json.dependencies) {
-          Object.keys(json.dependencies).forEach(dependency => {
-            if (packages.indexOf(dependency) >= 0) {
-              const prevVersion = json.dependencies[dependency];
-              const nextVersion = getNextVersion(
-                prevVersion.replace('^', ''),
-                version
-              );
-              json.dependencies[dependency] = `^${nextVersion}`;
-            }
-          });
-        }
-      } else if (json.peerDependencies) {
-        let peerVersion = json.peerDependencies.react.replace('^', '');
-
-        // If the previous release was a pre-release version,
-        // The peer dependency will contain multiple versions, eg "^16.0.0 || 16.3.0-alpha.0"
-        // In this case, assume the first one will be the major and extract it.
-        if (peerVersion.includes(' || ')) {
-          peerVersion = peerVersion.split(' || ')[0];
-        }
-
-        // Release engineers can manually update minor and bugfix versions,
-        // But we should ensure that major versions always match.
-        if (semver.major(version) !== semver.major(peerVersion)) {
-          json.peerDependencies.react = `^${semver.major(version)}.0.0`;
-        } else {
-          json.peerDependencies.react = `^${peerVersion}`;
-        }
-
-        // If this is a prerelease, update the react dependency as well.
-        // A dependency on a major version won't satisfy a prerelease version.
-        // So rather than eg "^16.0.0" we need "^16.0.0 || 16.3.0-alpha.0"
-        if (prerelease) {
-          json.peerDependencies.react += ` || ${version}`;
-        }
-
-        // Update inter-package dependencies as well.
-        // e.g. react-test-renderer depends on react-is
-        if (json.dependencies) {
-          Object.keys(json.dependencies).forEach(dependency => {
-            if (packages.indexOf(dependency) >= 0) {
-              const prevVersion = json.dependencies[dependency];
-
-              // Special case to handle e.g. react-noop-renderer
-              if (prevVersion === '*') {
-                return;
-              }
-
-              const nextVersion = getNextVersion(
-                prevVersion.replace('^', ''),
-                version
-              );
-              json.dependencies[dependency] = `^${nextVersion}`;
-            }
-          });
-        }
-      }
-
-      await writeJson(path, json, {spaces: 2});
-    };
-    await Promise.all(packages.map(updateProjectPackage));
-
-    // Version sanity check
-    await exec('yarn version-check', {cwd});
-
-    await execUnlessDry(
-      `git commit -am "Updating package versions for release ${version}"`,
-      {cwd, dry}
-    );
-  } catch (error) {
-    throw Error(
-      chalk`
-      Failed while updating package versions
-
-      {white ${error.message}}
-    `
-    );
-  }
-};
-
-module.exports = async params => {
-  return logPromise(update(params), 'Updating package versions');
-};
diff --git a/scripts/release/build-commands/update-yarn-dependencies.js b/scripts/release/build-commands/update-yarn-dependencies.js
deleted file mode 100644
index b8defaf5ea..0000000000
--- a/scripts/release/build-commands/update-yarn-dependencies.js
+++ /dev/null
@@ -1,38 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const chalk = require('chalk');
-const {exec} = require('child-process-promise');
-const {dependencies} = require('../config');
-const {execRead, execUnlessDry, logPromise} = require('../utils');
-
-const update = async ({cwd, dry, version}) => {
-  await exec(`yarn upgrade ${dependencies.join(' ')}`, {cwd});
-
-  const modifiedFiles = await execRead('git ls-files -m', {cwd});
-
-  // If yarn.lock has changed we should commit it.
-  // If anything else has changed, it's an error.
-  if (modifiedFiles) {
-    if (modifiedFiles !== 'yarn.lock') {
-      throw Error(
-        chalk`
-        Unexpected modifications
-
-        {white The following files have been modified unexpectedly:}
-        {gray ${modifiedFiles}}
-        `
-      );
-    }
-
-    await execUnlessDry(
-      `git commit -am "Updating yarn.lock file for ${version} release"`,
-      {cwd, dry}
-    );
-  }
-};
-
-module.exports = async params => {
-  return logPromise(update(params), 'Upgrading NPM dependencies');
-};
diff --git a/scripts/release/build-commands/validate-version.js b/scripts/release/build-commands/validate-version.js
deleted file mode 100644
index 8329d3c38d..0000000000
--- a/scripts/release/build-commands/validate-version.js
+++ /dev/null
@@ -1,20 +0,0 @@
-'use strict';
-
-const chalk = require('chalk');
-const {readJson} = require('fs-extra');
-const {join} = require('path');
-const semver = require('semver');
-
-module.exports = async ({cwd, version}) => {
-  if (!semver.valid(version)) {
-    throw Error('Invalid version specified');
-  }
-
-  const rootPackage = await readJson(join(cwd, 'package.json'));
-
-  if (!semver.gt(version, rootPackage.version)) {
-    throw Error(
-      chalk`Version {white ${rootPackage.version}} has already been published`
-    );
-  }
-};
diff --git a/scripts/release/build.js b/scripts/release/build.js
deleted file mode 100755
index 9288af14bf..0000000000
--- a/scripts/release/build.js
+++ /dev/null
@@ -1,82 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const {exec} = require('child_process');
-
-// Follows the steps outlined in github.com/facebook/react/issues/10620
-const run = async () => {
-  const chalk = require('chalk');
-  const logUpdate = require('log-update');
-  const {getPublicPackages, getPackages} = require('./utils');
-
-  const addGitTag = require('./build-commands/add-git-tag');
-  const buildArtifacts = require('./build-commands/build-artifacts');
-  const checkCircleCiStatus = require('./build-commands/check-circle-ci-status');
-  const checkEnvironmentVariables = require('./build-commands/check-environment-variables');
-  const checkNpmPermissions = require('./build-commands/check-npm-permissions');
-  const checkPackageDependencies = require('./build-commands/check-package-dependencies');
-  const checkUncommittedChanges = require('./build-commands/check-uncommitted-changes');
-  const installYarnDependencies = require('./build-commands/install-yarn-dependencies');
-  const parseBuildParameters = require('./build-commands/parse-build-parameters');
-  const printPostBuildSummary = require('./build-commands/print-post-build-summary');
-  const runAutomatedTests = require('./build-commands/run-automated-tests');
-  const runAutomatedBundleTests = require('./build-commands/run-automated-bundle-tests');
-  const updateGit = require('./build-commands/update-git');
-  const updateNoopRendererDependencies = require('./build-commands/update-noop-renderer-dependencies');
-  const updatePackageVersions = require('./build-commands/update-package-versions');
-  const updateYarnDependencies = require('./build-commands/update-yarn-dependencies');
-  const validateVersion = require('./build-commands/validate-version');
-
-  try {
-    const params = parseBuildParameters();
-    params.packages = getPublicPackages();
-
-    await checkEnvironmentVariables(params);
-    await validateVersion(params);
-    await checkUncommittedChanges(params);
-    await checkNpmPermissions(params);
-    await updateGit(params);
-    await checkCircleCiStatus(params);
-    await installYarnDependencies(params);
-    await checkPackageDependencies(params);
-    await updateYarnDependencies(params);
-    await runAutomatedTests(params);
-    // Also update NPM dependencies for private packages (e.g. react-native-renderer)
-    // Even though we don't publish these to NPM,
-    // mismatching dependencies can cause `yarn install` to install duplicate packages.
-    await updatePackageVersions({
-      ...params,
-      packages: getPackages(),
-    });
-    await updateNoopRendererDependencies(params);
-    await buildArtifacts(params);
-    await runAutomatedBundleTests(params);
-    await addGitTag(params);
-    await printPostBuildSummary(params);
-  } catch (error) {
-    logUpdate.clear();
-
-    const message = error.message.trim().replace(/\n +/g, '\n');
-    const stack = error.stack.replace(error.message, '');
-
-    console.log(
-      `${chalk.bgRed.white(' ERROR ')} ${chalk.red(message)}\n\n${chalk.gray(
-        stack
-      )}`
-    );
-
-    process.exit(1);
-  }
-};
-
-// Install (or update) release script dependencies before proceeding.
-// This needs to be done before we require() the first NPM module.
-exec('yarn install', {cwd: __dirname}, (error, stdout, stderr) => {
-  if (error) {
-    console.error(error);
-    process.exit(1);
-  } else {
-    run();
-  }
-});
diff --git a/scripts/release/ci-add-build-info-json.js b/scripts/release/ci-add-build-info-json.js
new file mode 100755
index 0000000000..4a42038f65
--- /dev/null
+++ b/scripts/release/ci-add-build-info-json.js
@@ -0,0 +1,72 @@
+#!/usr/bin/env node
+
+'use strict';
+
+// This script is run by Circle CI (see ../scripts/circleci).
+// It is not meant to be run as part of the local build or publish process.
+// It exists to share code between the Node release scripts and CI bash scripts.
+
+// IMPORTANT:
+// Changes below should be mirrored in ./create-canary-commands/add-build-info-json.js
+
+const {exec} = require('child_process');
+const {existsSync} = require('fs');
+const {join} = require('path');
+
+const run = async () => {
+  const {writeJson, readJson} = require('fs-extra');
+  const {getBuildInfo, getPublicPackages} = require('./utils');
+
+  const cwd = join(__dirname, '..', '..');
+
+  const {
+    branch,
+    buildNumber,
+    checksum,
+    commit,
+    reactVersion,
+  } = await getBuildInfo();
+
+  const packages = getPublicPackages(join(cwd, 'packages'));
+  const packagesDir = join(cwd, 'packages');
+
+  const buildInfoJSON = {
+    branch,
+    buildNumber,
+    checksum,
+    commit,
+    environment: 'ci',
+    reactVersion,
+  };
+
+  for (let i = 0; i < packages.length; i++) {
+    const packageName = packages[i];
+    const packagePath = join(packagesDir, packageName);
+    const packageJSON = await readJson(join(packagePath, 'package.json'));
+
+    // Verify all public packages include "build-info.json" in the files array.
+    if (!packageJSON.files.includes('build-info.json')) {
+      console.error(
+        `${packageName} must include "build-info.json" in files array.`
+      );
+      process.exit(1);
+    }
+
+    // Add build info JSON to package.
+    if (existsSync(join(packagePath, 'npm'))) {
+      const buildInfoJSONPath = join(packagePath, 'npm', 'build-info.json');
+      await writeJson(buildInfoJSONPath, buildInfoJSON, {spaces: 2});
+    }
+  }
+};
+
+// Install (or update) release script dependencies before proceeding.
+// This needs to be done before we require() the first NPM module.
+exec('yarn install', {cwd: __dirname}, (error, stdout, stderr) => {
+  if (error) {
+    console.error(error);
+    process.exit(1);
+  } else {
+    run();
+  }
+});
diff --git a/scripts/release/ci-update-package-versions.js b/scripts/release/ci-update-package-versions.js
new file mode 100755
index 0000000000..c0042662d0
--- /dev/null
+++ b/scripts/release/ci-update-package-versions.js
@@ -0,0 +1,31 @@
+#!/usr/bin/env node
+
+'use strict';
+
+// This script is run by Circle CI (see ../scripts/circleci).
+// It is not meant to be run as part of the local build or publish process.
+// It exists to share code between the Node release scripts and CI bash scripts.
+
+const {exec} = require('child_process');
+const {join} = require('path');
+
+const run = async () => {
+  const {getBuildInfo, updateVersionsForCanary} = require('./utils');
+
+  const cwd = join(__dirname, '..', '..');
+
+  const {reactVersion, version} = await getBuildInfo();
+
+  await updateVersionsForCanary(cwd, reactVersion, version);
+};
+
+// Install (or update) release script dependencies before proceeding.
+// This needs to be done before we require() the first NPM module.
+exec('yarn install', {cwd: __dirname}, (error, stdout, stderr) => {
+  if (error) {
+    console.error(error);
+    process.exit(1);
+  } else {
+    run();
+  }
+});
diff --git a/scripts/release/config.js b/scripts/release/config.js
deleted file mode 100644
index ec88d0074b..0000000000
--- a/scripts/release/config.js
+++ /dev/null
@@ -1,56 +0,0 @@
-'use strict';
-
-const dependencies = ['object-assign', 'prop-types'];
-
-const paramDefinitions = [
-  {
-    name: 'dry',
-    type: Boolean,
-    description: 'Build artifacts but do not commit or publish',
-    defaultValue: false,
-  },
-  {
-    name: 'path',
-    type: String,
-    alias: 'p',
-    description:
-      'Location of React repository to release; defaults to [bold]{cwd}',
-    defaultValue: '.',
-  },
-  {
-    name: 'version',
-    type: String,
-    alias: 'v',
-    description: 'Semantic version number',
-  },
-  {
-    name: 'branch',
-    type: String,
-    alias: 'b',
-    description: 'Branch to build from; defaults to [bold]{master}',
-    defaultValue: 'master',
-  },
-  {
-    name: 'local',
-    type: Boolean,
-    description:
-      "Don't push or pull changes from remote repo. Don't check CI status.",
-  },
-  {
-    name: 'tag',
-    type: String,
-    description:
-      'The npm dist tag; defaults to [bold]{latest} for a stable' +
-      'release, [bold]{next} for unstable',
-  },
-  {
-    name: 'skipCI',
-    type: Boolean,
-    description: 'Skip Circle CI status check (requires confirmation)',
-  },
-];
-
-module.exports = {
-  dependencies,
-  paramDefinitions,
-};
diff --git a/scripts/release/create-canary-commands/add-build-info-json.js b/scripts/release/create-canary-commands/add-build-info-json.js
new file mode 100644
index 0000000000..10ff6df371
--- /dev/null
+++ b/scripts/release/create-canary-commands/add-build-info-json.js
@@ -0,0 +1,50 @@
+#!/usr/bin/env node
+
+'use strict';
+
+// IMPORTANT:
+// Changes below should be mirrored in ../ci-add-build-info-json.js
+
+const {existsSync} = require('fs');
+const {writeJson, readJson} = require('fs-extra');
+const {join} = require('path');
+const {getPublicPackages, logPromise} = require('../utils');
+const theme = require('../theme');
+
+const run = async ({branch, checksum, commit, reactVersion, tempDirectory}) => {
+  const packages = getPublicPackages(join(tempDirectory, 'packages'));
+  const packagesDir = join(tempDirectory, 'packages');
+
+  const buildInfoJSON = {
+    branch,
+    buildNumber: null,
+    checksum,
+    commit,
+    environment: 'local',
+    reactVersion,
+  };
+
+  for (let i = 0; i < packages.length; i++) {
+    const packageName = packages[i];
+    const packagePath = join(packagesDir, packageName);
+    const packageJSON = await readJson(join(packagePath, 'package.json'));
+
+    // Verify all public packages include "build-info.json" in the files array.
+    if (!packageJSON.files.includes('build-info.json')) {
+      console.error(
+        theme`{error ${packageName} must include "build-info.json" in files array.}`
+      );
+      process.exit(1);
+    }
+
+    // Add build info JSON to package.
+    if (existsSync(join(packagePath, 'npm'))) {
+      const buildInfoJSONPath = join(packagePath, 'npm', 'build-info.json');
+      await writeJson(buildInfoJSONPath, buildInfoJSON, {spaces: 2});
+    }
+  }
+};
+
+module.exports = async params => {
+  return logPromise(run(params), 'Adding build metadata to packages');
+};
diff --git a/scripts/release/create-canary-commands/build-artifacts.js b/scripts/release/create-canary-commands/build-artifacts.js
new file mode 100644
index 0000000000..3435a625b5
--- /dev/null
+++ b/scripts/release/create-canary-commands/build-artifacts.js
@@ -0,0 +1,25 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const {exec} = require('child-process-promise');
+const {join} = require('path');
+const {logPromise} = require('../utils');
+
+const run = async ({cwd, dry, tempDirectory}) => {
+  const defaultOptions = {
+    cwd: tempDirectory,
+  };
+
+  await exec('yarn install', defaultOptions);
+  await exec('yarn build -- --extract-errors', defaultOptions);
+
+  const tempNodeModulesPath = join(tempDirectory, 'build', 'node_modules');
+  const buildPath = join(cwd, 'build');
+
+  await exec(`cp -r ${tempNodeModulesPath} ${buildPath}`);
+};
+
+module.exports = async params => {
+  return logPromise(run(params), 'Building artifacts', true);
+};
diff --git a/scripts/release/create-canary-commands/confirm-automated-testing.js b/scripts/release/create-canary-commands/confirm-automated-testing.js
new file mode 100644
index 0000000000..8e28e92b56
--- /dev/null
+++ b/scripts/release/create-canary-commands/confirm-automated-testing.js
@@ -0,0 +1,24 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const clear = require('clear');
+const {confirm} = require('../utils');
+const theme = require('../theme');
+
+const run = async () => {
+  clear();
+
+  console.log(
+    theme.caution(
+      'This script does not run any automated tests.' +
+        'You should run them manually before creating a canary release.'
+    )
+  );
+
+  await confirm('Do you want to proceed?');
+
+  clear();
+};
+
+module.exports = run;
diff --git a/scripts/release/create-canary-commands/copy-repo-to-temp-directory.js b/scripts/release/create-canary-commands/copy-repo-to-temp-directory.js
new file mode 100644
index 0000000000..3d859b7e23
--- /dev/null
+++ b/scripts/release/create-canary-commands/copy-repo-to-temp-directory.js
@@ -0,0 +1,34 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const {exec} = require('child-process-promise');
+const {join} = require('path');
+const {tmpdir} = require('os');
+const {logPromise} = require('../utils');
+const theme = require('../theme');
+
+const run = async ({commit, cwd, tempDirectory}) => {
+  const directory = `react-${commit}`;
+  const temp = tmpdir();
+
+  if (tempDirectory !== join(tmpdir(), directory)) {
+    throw Error(`Unexpected temporary directory "${tempDirectory}"`);
+  }
+
+  await exec(`rm -rf ${directory}`, {cwd: temp});
+  await exec(`git archive --format=tar --output=${temp}/react.tgz ${commit}`, {
+    cwd,
+  });
+  await exec(`mkdir ${directory}`, {cwd: temp});
+  await exec(`tar -xf ./react.tgz -C ./${directory}`, {cwd: temp});
+};
+
+module.exports = async params => {
+  return logPromise(
+    run(params),
+    theme`Copying React repo to temporary directory ({path ${
+      params.tempDirectory
+    }})`
+  );
+};
diff --git a/scripts/release/create-canary-commands/npm-pack-and-unpack.js b/scripts/release/create-canary-commands/npm-pack-and-unpack.js
new file mode 100644
index 0000000000..34736bb632
--- /dev/null
+++ b/scripts/release/create-canary-commands/npm-pack-and-unpack.js
@@ -0,0 +1,57 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const {join} = require('path');
+const {exec} = require('child-process-promise');
+const {readdirSync} = require('fs');
+const {readJsonSync} = require('fs-extra');
+const {logPromise} = require('../utils');
+
+const run = async ({cwd, dry, tempDirectory}) => {
+  // Cleanup from previous build.
+  await exec(`rm -rf ./build`, {cwd});
+
+  // NPM pack all built packages.
+  // We do this to ensure that the package.json files array is correct.
+  const builtPackages = readdirSync(join(tempDirectory, 'build/node_modules/'));
+  for (let i = 0; i < builtPackages.length; i++) {
+    await exec(`npm pack ./${builtPackages[i]}`, {
+      cwd: `${tempDirectory}/build/node_modules/`,
+    });
+  }
+
+  await exec('mkdir build', {cwd});
+  await exec('mkdir build/node_modules', {cwd});
+  await exec(
+    `cp -r ${tempDirectory}/build/node_modules/*.tgz ./build/node_modules/`,
+    {cwd}
+  );
+
+  // Unpack packages and prepare to publish.
+  const compressedPackages = readdirSync(join(cwd, 'build/node_modules/'));
+  for (let i = 0; i < compressedPackages.length; i++) {
+    await exec(
+      `tar -zxvf ./build/node_modules/${
+        compressedPackages[i]
+      } -C ./build/node_modules/`,
+      {cwd}
+    );
+    const packageJSON = readJsonSync(
+      join(cwd, `./build/node_modules/package/package.json`)
+    );
+    await exec(
+      `mv ./build/node_modules/package ./build/node_modules/${
+        packageJSON.name
+      }`,
+      {cwd}
+    );
+  }
+
+  // Cleanup.
+  await exec(`rm ./build/node_modules/*.tgz`, {cwd});
+};
+
+module.exports = async params => {
+  return logPromise(run(params), 'Packing artifacts');
+};
diff --git a/scripts/release/create-canary-commands/update-version-numbers.js b/scripts/release/create-canary-commands/update-version-numbers.js
new file mode 100644
index 0000000000..1c178c83c0
--- /dev/null
+++ b/scripts/release/create-canary-commands/update-version-numbers.js
@@ -0,0 +1,13 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const {logPromise, updateVersionsForCanary} = require('../utils');
+const theme = require('../theme');
+
+module.exports = async ({reactVersion, tempDirectory, version}) => {
+  return logPromise(
+    updateVersionsForCanary(tempDirectory, reactVersion, version),
+    theme`Updating version numbers ({version ${version}})`
+  );
+};
diff --git a/scripts/release/create-canary.js b/scripts/release/create-canary.js
new file mode 100755
index 0000000000..dc00b3a7b3
--- /dev/null
+++ b/scripts/release/create-canary.js
@@ -0,0 +1,57 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const {tmpdir} = require('os');
+const {join} = require('path');
+const {getBuildInfo, handleError} = require('./utils');
+
+// This script is an escape hatch!
+// It exists for special case manual builds.
+// The typical suggested release process is to create a canary from a CI artifact.
+// This build script is optimized for speed and simplicity.
+// It doesn't run all of the tests that the CI environment runs.
+// You're expected to run those manually before publishing a release.
+
+const addBuildInfoJSON = require('./create-canary-commands/add-build-info-json');
+const buildArtifacts = require('./create-canary-commands/build-artifacts');
+const confirmAutomatedTesting = require('./create-canary-commands/confirm-automated-testing');
+const copyRepoToTempDirectory = require('./create-canary-commands/copy-repo-to-temp-directory');
+const npmPackAndUnpack = require('./create-canary-commands/npm-pack-and-unpack');
+const printPrereleaseSummary = require('./shared-commands/print-prerelease-summary');
+const updateVersionNumbers = require('./create-canary-commands/update-version-numbers');
+
+const run = async () => {
+  try {
+    const cwd = join(__dirname, '..', '..');
+    const {
+      branch,
+      checksum,
+      commit,
+      reactVersion,
+      version,
+    } = await getBuildInfo();
+    const tempDirectory = join(tmpdir(), `react-${commit}`);
+    const params = {
+      branch,
+      checksum,
+      commit,
+      cwd,
+      reactVersion,
+      tempDirectory,
+      version,
+    };
+
+    await confirmAutomatedTesting(params);
+    await copyRepoToTempDirectory(params);
+    await updateVersionNumbers(params);
+    await addBuildInfoJSON(params);
+    await buildArtifacts(params);
+    await npmPackAndUnpack(params);
+    await printPrereleaseSummary(params);
+  } catch (error) {
+    handleError(error);
+  }
+};
+
+run();
diff --git a/scripts/release/package.json b/scripts/release/package.json
index c5f9f99af3..f0f1fe033d 100644
--- a/scripts/release/package.json
+++ b/scripts/release/package.json
@@ -7,10 +7,12 @@
   "dependencies": {
     "chalk": "^2.1.0",
     "child-process-promise": "^2.2.1",
+    "clear": "^0.1.0",
     "cli-spinners": "^1.1.0",
     "command-line-args": "^4.0.7",
     "command-line-usage": "^4.0.1",
-    "figlet": "^1.2.0",
+    "diff": "^3.5.0",
+    "folder-hash": "^2.1.2",
     "fs-extra": "^4.0.2",
     "log-update": "^2.1.0",
     "prompt-promise": "^1.0.3",
diff --git a/scripts/release/prepare-canary-commands/check-environment-variables.js b/scripts/release/prepare-canary-commands/check-environment-variables.js
new file mode 100644
index 0000000000..dcb7785d99
--- /dev/null
+++ b/scripts/release/prepare-canary-commands/check-environment-variables.js
@@ -0,0 +1,30 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const theme = require('../theme');
+
+module.exports = () => {
+  if (!process.env.CIRCLE_CI_API_TOKEN) {
+    console.error(
+      theme`
+      {error Missing CircleCI API token}
+
+      The CircleCI API is used to download build artifacts.
+      This API requires a token which must be exposed via a {underline CIRCLE_CI_API_TOKEN} environment var.
+      In order to run this script you will need to create your own API token.
+      Instructions can be found at:
+
+      {link https://circleci.com/docs/api/v1-reference/#getting-started}
+
+      To make this token available to the release script, add it to your {path .bash_profile} like so:
+
+      {dimmed # React release script}
+      export CIRCLE_CI_API_TOKEN=<your-token-here>
+    `
+        .replace(/\n +/g, '\n')
+        .trim()
+    );
+    process.exit(1);
+  }
+};
diff --git a/scripts/release/prepare-canary-commands/download-build-artifacts.js b/scripts/release/prepare-canary-commands/download-build-artifacts.js
new file mode 100644
index 0000000000..3589b7b0fc
--- /dev/null
+++ b/scripts/release/prepare-canary-commands/download-build-artifacts.js
@@ -0,0 +1,61 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const http = require('request-promise-json');
+const {exec} = require('child-process-promise');
+const {readdirSync} = require('fs');
+const {readJsonSync} = require('fs-extra');
+const {join} = require('path');
+const {logPromise} = require('../utils');
+const theme = require('../theme');
+
+const run = async ({build, cwd}) => {
+  // https://circleci.com/docs/2.0/artifacts/#downloading-all-artifacts-for-a-build-on-circleci
+  const metadataURL = `https://circleci.com/api/v1.1/project/github/facebook/react/${build}/artifacts?circle-token=${
+    process.env.CIRCLE_CI_API_TOKEN
+  }`;
+  const metadata = await http.get(metadataURL, true);
+  const nodeModulesURL = metadata.find(
+    entry => entry.path === 'home/circleci/project/node_modules.tgz'
+  ).url;
+
+  // Download and extract artifact
+  await exec(`rm -rf ./build/node_modules*`, {cwd});
+  await exec(`curl ${nodeModulesURL} --output ./build/node_modules.tgz`, {cwd});
+  await exec(`mkdir ./build/node_modules`, {cwd});
+  await exec(`tar zxvf ./build/node_modules.tgz -C ./build/node_modules/`, {
+    cwd,
+  });
+
+  // Unpack packages and prepare to publish
+  const compressedPackages = readdirSync(join(cwd, 'build/node_modules/'));
+  for (let i = 0; i < compressedPackages.length; i++) {
+    await exec(
+      `tar zxvf ./build/node_modules/${
+        compressedPackages[i]
+      } -C ./build/node_modules/`,
+      {cwd}
+    );
+    const packageJSON = readJsonSync(
+      join(cwd, `/build/node_modules/package/package.json`)
+    );
+    await exec(
+      `mv ./build/node_modules/package ./build/node_modules/${
+        packageJSON.name
+      }`,
+      {cwd}
+    );
+  }
+
+  // Cleanup
+  await exec(`rm ./build/node_modules.tgz`, {cwd});
+  await exec(`rm ./build/node_modules/*.tgz`, {cwd});
+};
+
+module.exports = async ({build, cwd}) => {
+  return logPromise(
+    run({build, cwd}),
+    theme`Downloading artifacts from Circle CI for build {build ${build}}`
+  );
+};
diff --git a/scripts/release/prepare-canary-commands/parse-params.js b/scripts/release/prepare-canary-commands/parse-params.js
new file mode 100644
index 0000000000..cb32adfa61
--- /dev/null
+++ b/scripts/release/prepare-canary-commands/parse-params.js
@@ -0,0 +1,45 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const commandLineArgs = require('command-line-args');
+const commandLineUsage = require('command-line-usage');
+
+const paramDefinitions = [
+  {
+    name: 'build',
+    type: Number,
+    description:
+      'Circle CI build identifier (e.g. https://circleci.com/gh/facebook/react/<build>)',
+  },
+];
+
+module.exports = () => {
+  const params = commandLineArgs(paramDefinitions);
+
+  if (!params.build) {
+    const usage = commandLineUsage([
+      {
+        content:
+          'Prepare a Circle CI build to be published to NPM as a canary.',
+      },
+      {
+        header: 'Options',
+        optionList: paramDefinitions,
+      },
+      {
+        header: 'Examples',
+        content: [
+          {
+            desc: 'Example:',
+            example: '$ ./prepare-canary.js [bold]{--build=}[underline]{12639}',
+          },
+        ],
+      },
+    ]);
+    console.log(usage);
+    process.exit(1);
+  }
+
+  return params;
+};
diff --git a/scripts/release/prepare-canary.js b/scripts/release/prepare-canary.js
new file mode 100755
index 0000000000..6de65448f3
--- /dev/null
+++ b/scripts/release/prepare-canary.js
@@ -0,0 +1,27 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const {join} = require('path');
+const {getPublicPackages, handleError} = require('./utils');
+
+const checkEnvironmentVariables = require('./prepare-canary-commands/check-environment-variables');
+const downloadBuildArtifacts = require('./prepare-canary-commands/download-build-artifacts');
+const parseParams = require('./prepare-canary-commands/parse-params');
+const printPrereleaseSummary = require('./shared-commands/print-prerelease-summary');
+
+const run = async () => {
+  try {
+    const params = parseParams();
+    params.cwd = join(__dirname, '..', '..');
+    params.packages = await getPublicPackages();
+
+    await checkEnvironmentVariables(params);
+    await downloadBuildArtifacts(params);
+    await printPrereleaseSummary(params);
+  } catch (error) {
+    handleError(error);
+  }
+};
+
+run();
diff --git a/scripts/release/prepare-stable-commands/check-out-packages.js b/scripts/release/prepare-stable-commands/check-out-packages.js
new file mode 100644
index 0000000000..d29dec9719
--- /dev/null
+++ b/scripts/release/prepare-stable-commands/check-out-packages.js
@@ -0,0 +1,29 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const {exec} = require('child-process-promise');
+const {join} = require('path');
+const {logPromise} = require('../utils');
+const theme = require('../theme');
+
+const run = async ({cwd, packages, version}) => {
+  // Cleanup from previous builds
+  await exec(`rm -rf ./build/node_modules*`, {cwd});
+  await exec(`mkdir ./build/node_modules`, {cwd});
+
+  const nodeModulesPath = join(cwd, 'build/node_modules');
+
+  // Checkout canary release from NPM for all local packages
+  for (let i = 0; i < packages.length; i++) {
+    const packageName = packages[i];
+    await exec(`npm i ${packageName}@${version}`, {cwd: nodeModulesPath});
+  }
+};
+
+module.exports = async params => {
+  return logPromise(
+    run(params),
+    theme`Checking out canary from NPM {version ${params.version}}`
+  );
+};
diff --git a/scripts/release/prepare-stable-commands/confirm-stable-version-numbers.js b/scripts/release/prepare-stable-commands/confirm-stable-version-numbers.js
new file mode 100644
index 0000000000..d00bb38576
--- /dev/null
+++ b/scripts/release/prepare-stable-commands/confirm-stable-version-numbers.js
@@ -0,0 +1,58 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const prompt = require('prompt-promise');
+const semver = require('semver');
+const theme = require('../theme');
+
+const run = async (params, versionsMap) => {
+  const groupedVersionsMap = new Map();
+
+  // Group packages with the same source versions.
+  // We want these to stay lock-synced anyway.
+  // This will require less redundant input from the user later,
+  // and reduce the likelihood of human error (entering the wrong version).
+  versionsMap.forEach((version, packageName) => {
+    if (!groupedVersionsMap.has(version)) {
+      groupedVersionsMap.set(version, [packageName]);
+    } else {
+      groupedVersionsMap.get(version).push(packageName);
+    }
+  });
+
+  // Prompt user to confirm or override each version group.
+  const entries = [...groupedVersionsMap.entries()];
+  for (let i = 0; i < entries.length; i++) {
+    const [bestGuessVersion, packages] = entries[i];
+    const packageNames = packages.map(name => theme.package(name)).join(', ');
+    const defaultVersion = bestGuessVersion
+      ? theme.version(` (default ${bestGuessVersion})`)
+      : '';
+    const version =
+      (await prompt(
+        theme`{spinnerSuccess ✓} Version for ${packageNames}${defaultVersion}: `
+      )) || bestGuessVersion;
+    prompt.done();
+
+    // Verify a valid version has been supplied.
+    try {
+      semver(version);
+
+      packages.forEach(packageName => {
+        versionsMap.set(packageName, version);
+      });
+    } catch (error) {
+      console.log(
+        theme`{spinnerError ✘} Version {version ${version}} is invalid.`
+      );
+
+      // Prompt again
+      i--;
+    }
+  }
+};
+
+// Run this directly because it's fast,
+// and logPromise would interfere with console prompting.
+module.exports = run;
diff --git a/scripts/release/prepare-stable-commands/guess-stable-version-numbers.js b/scripts/release/prepare-stable-commands/guess-stable-version-numbers.js
new file mode 100644
index 0000000000..11508489e4
--- /dev/null
+++ b/scripts/release/prepare-stable-commands/guess-stable-version-numbers.js
@@ -0,0 +1,34 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const semver = require('semver');
+const {execRead, logPromise} = require('../utils');
+
+const run = async ({cwd, packages}, versionsMap) => {
+  for (let i = 0; i < packages.length; i++) {
+    const packageName = packages[i];
+
+    try {
+      // In case local package JSONs are outdated,
+      // guess the next version based on the latest NPM release.
+      const version = await execRead(`npm show ${packageName} version`);
+      const {major, minor, patch} = semver(version);
+
+      // Guess the next version by incrementing patch.
+      // The script will confirm this later.
+      versionsMap.set(packageName, `${major}.${minor}.${patch + 1}`);
+    } catch (error) {
+      // If the package has not yet been published,
+      // we'll require a version number to be entered later.
+      versionsMap.set(packageName, null);
+    }
+  }
+};
+
+module.exports = async (params, versionsMap) => {
+  return logPromise(
+    run(params, versionsMap),
+    'Guessing stable version numbers'
+  );
+};
diff --git a/scripts/release/prepare-stable-commands/parse-params.js b/scripts/release/prepare-stable-commands/parse-params.js
new file mode 100644
index 0000000000..2d553a9047
--- /dev/null
+++ b/scripts/release/prepare-stable-commands/parse-params.js
@@ -0,0 +1,44 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const commandLineArgs = require('command-line-args');
+const commandLineUsage = require('command-line-usage');
+
+const paramDefinitions = [
+  {
+    name: 'version',
+    type: String,
+    description: 'Version of published canary release (e.g. 0.0.0-ddaf2b07c)',
+  },
+];
+
+module.exports = () => {
+  const params = commandLineArgs(paramDefinitions);
+
+  if (!params.version) {
+    const usage = commandLineUsage([
+      {
+        content: 'Prepare a published canary release to be promoted to stable.',
+      },
+      {
+        header: 'Options',
+        optionList: paramDefinitions,
+      },
+      {
+        header: 'Examples',
+        content: [
+          {
+            desc: 'Example:',
+            example:
+              '$ ./prepare-stable.js [bold]{--version=}[underline]{0.0.0-ddaf2b07c}',
+          },
+        ],
+      },
+    ]);
+    console.log(usage);
+    process.exit(1);
+  }
+
+  return params;
+};
diff --git a/scripts/release/prepare-stable-commands/update-stable-version-numbers.js b/scripts/release/prepare-stable-commands/update-stable-version-numbers.js
new file mode 100644
index 0000000000..397ff07e77
--- /dev/null
+++ b/scripts/release/prepare-stable-commands/update-stable-version-numbers.js
@@ -0,0 +1,175 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const clear = require('clear');
+const {readFileSync, writeFileSync} = require('fs');
+const {readJson, writeJson} = require('fs-extra');
+const {join, relative} = require('path');
+const {confirm, execRead, printDiff} = require('../utils');
+const theme = require('../theme');
+
+const run = async ({cwd, packages, version}, versionsMap) => {
+  const nodeModulesPath = join(cwd, 'build/node_modules');
+
+  // Cache all package JSONs for easy lookup below.
+  const sourcePackageJSONs = new Map();
+  for (let i = 0; i < packages.length; i++) {
+    const packageName = packages[i];
+    const sourcePackageJSON = await readJson(
+      join(cwd, 'packages', packageName, 'package.json')
+    );
+    sourcePackageJSONs.set(packageName, sourcePackageJSON);
+  }
+
+  const updateDependencies = async (targetPackageJSON, key) => {
+    const targetDependencies = targetPackageJSON[key];
+    if (targetDependencies) {
+      const sourceDependencies = sourcePackageJSONs.get(targetPackageJSON.name)[
+        key
+      ];
+
+      for (let i = 0; i < packages.length; i++) {
+        const dependencyName = packages[i];
+        const targetDependency = targetDependencies[dependencyName];
+
+        if (targetDependency) {
+          // For example, say we're updating react-dom's dependency on scheduler.
+          // We compare source packages to determine what the new scheduler dependency constraint should be.
+          // To do this, we look at both the local version of the scheduler (e.g. 0.11.0),
+          // and the dependency constraint in the local version of react-dom (e.g. scheduler@^0.11.0).
+          const sourceDependencyVersion = sourcePackageJSONs.get(dependencyName)
+            .version;
+          const sourceDependencyConstraint = sourceDependencies[dependencyName];
+
+          // If the source dependency's version and the constraint match,
+          // we will need to update the constraint to point at the dependency's new release version,
+          // (e.g. scheduler@^0.11.0 becomes scheduler@^0.12.0 when we release scheduler 0.12.0).
+          // Otherwise we leave the constraint alone (e.g. react@^16.0.0 doesn't change between releases).
+          // Note that in both cases, we must update the target package JSON,
+          // since canary releases are all locked to the canary version (e.g. 0.0.0-ddaf2b07c).
+          if (
+            sourceDependencyVersion ===
+            sourceDependencyConstraint.replace(/^[\^\~]/, '')
+          ) {
+            targetDependencies[
+              dependencyName
+            ] = sourceDependencyConstraint.replace(
+              sourceDependencyVersion,
+              versionsMap.get(dependencyName)
+            );
+          } else {
+            targetDependencies[dependencyName] = sourceDependencyConstraint;
+          }
+        }
+      }
+    }
+  };
+
+  // Update all package JSON versions and their dependencies/peerDependencies.
+  // This must be done in a way that respects semver constraints (e.g. 16.7.0, ^16.7.0, ^16.0.0).
+  // To do this, we use the dependencies defined in the source package JSONs,
+  // because the canary dependencies have already been flattened to an exact match (e.g. 0.0.0-ddaf2b07c).
+  for (let i = 0; i < packages.length; i++) {
+    const packageName = packages[i];
+    const packageJSONPath = join(nodeModulesPath, packageName, 'package.json');
+    const packageJSON = await readJson(packageJSONPath);
+    packageJSON.version = versionsMap.get(packageName);
+
+    await updateDependencies(packageJSON, 'dependencies');
+    await updateDependencies(packageJSON, 'peerDependencies');
+
+    await writeJson(packageJSONPath, packageJSON, {spaces: 2});
+  }
+
+  clear();
+
+  // Print the map of versions and their dependencies for confirmation.
+  const printDependencies = (maybeDependency, label) => {
+    if (maybeDependency) {
+      for (let dependencyName in maybeDependency) {
+        if (packages.includes(dependencyName)) {
+          console.log(
+            theme`• {package ${dependencyName}} {version ${
+              maybeDependency[dependencyName]
+            }} {dimmed ${label}}`
+          );
+        }
+      }
+    }
+  };
+  for (let i = 0; i < packages.length; i++) {
+    const packageName = packages[i];
+    const packageJSONPath = join(nodeModulesPath, packageName, 'package.json');
+    const packageJSON = await readJson(packageJSONPath);
+    console.log(
+      theme`\n{package ${packageName}} {version ${versionsMap.get(
+        packageName
+      )}}`
+    );
+    printDependencies(packageJSON.dependencies, 'dependency');
+    printDependencies(packageJSON.peerDependencies, 'peer');
+  }
+  await confirm('Do the versions above look correct?');
+
+  clear();
+
+  // A separate "React version" is used for the embedded renderer version to support DevTools,
+  // since it needs to distinguish between different version ranges of React.
+  // We need to replace it as well as the canary version number.
+  const buildInfoPath = join(nodeModulesPath, 'react', 'build-info.json');
+  const {reactVersion} = await readJson(buildInfoPath);
+
+  if (!reactVersion) {
+    console.error(
+      theme`{error Unsupported or invalid build metadata in} {path build/node_modules/react/build-info.json}` +
+        theme`{error . This could indicate that you have specified an outdated canary version.}`
+    );
+    process.exit(1);
+  }
+
+  // We print the diff to the console for review,
+  // but it can be large so let's also write it to disk.
+  const diffPath = join(cwd, 'build', 'temp.diff');
+  let diff = '';
+  let numFilesModified = 0;
+
+  // Find-and-replace hard coded version (in built JS) for renderers.
+  for (let i = 0; i < packages.length; i++) {
+    const packageName = packages[i];
+    const packagePath = join(nodeModulesPath, packageName);
+
+    let files = await execRead(
+      `find ${packagePath} -name '*.js' -exec echo {} \\;`,
+      {cwd}
+    );
+    files = files.split('\n');
+    files.forEach(path => {
+      const newStableVersion = versionsMap.get(packageName);
+      const beforeContents = readFileSync(path, 'utf8', {cwd});
+      let afterContents = beforeContents;
+      // Replace all canary version numbers (e.g. header @license).
+      while (afterContents.indexOf(version) >= 0) {
+        afterContents = afterContents.replace(version, newStableVersion);
+      }
+      // Replace inline renderer version numbers (e.g. shared/ReactVersion).
+      while (afterContents.indexOf(reactVersion) >= 0) {
+        afterContents = afterContents.replace(reactVersion, newStableVersion);
+      }
+      if (beforeContents !== afterContents) {
+        numFilesModified++;
+        diff += printDiff(path, beforeContents, afterContents);
+        writeFileSync(path, afterContents, {cwd});
+      }
+    });
+  }
+  writeFileSync(diffPath, diff, {cwd});
+  console.log(theme.header(`\n${numFilesModified} files have been updated.`));
+  console.log(
+    theme`A full diff is available at {path ${relative(cwd, diffPath)}}.`
+  );
+  await confirm('Do the changes above look correct?');
+};
+
+// Run this directly because logPromise would interfere with printing package dependencies.
+module.exports = run;
diff --git a/scripts/release/prepare-stable.js b/scripts/release/prepare-stable.js
new file mode 100755
index 0000000000..733cb109e9
--- /dev/null
+++ b/scripts/release/prepare-stable.js
@@ -0,0 +1,36 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const {join} = require('path');
+const {getPublicPackages, handleError} = require('./utils');
+
+const checkOutPackages = require('./prepare-stable-commands/check-out-packages');
+const confirmStableVersionNumbers = require('./prepare-stable-commands/confirm-stable-version-numbers');
+const guessStableVersionNumbers = require('./prepare-stable-commands/guess-stable-version-numbers');
+const parseParams = require('./prepare-stable-commands/parse-params');
+const printPrereleaseSummary = require('./shared-commands/print-prerelease-summary');
+const updateStableVersionNumbers = require('./prepare-stable-commands/update-stable-version-numbers');
+
+const run = async () => {
+  try {
+    const params = parseParams();
+    params.cwd = join(__dirname, '..', '..');
+    params.packages = await getPublicPackages();
+
+    // Map of package name to upcoming stable version.
+    // This Map is initially populated with guesses based on local versions.
+    // The developer running the release later confirms or overrides each version.
+    const versionsMap = new Map();
+
+    await checkOutPackages(params);
+    await guessStableVersionNumbers(params, versionsMap);
+    await confirmStableVersionNumbers(params, versionsMap);
+    await updateStableVersionNumbers(params, versionsMap);
+    await printPrereleaseSummary(params);
+  } catch (error) {
+    handleError(error);
+  }
+};
+
+run();
diff --git a/scripts/release/publish-commands/check-build-status.js b/scripts/release/publish-commands/check-build-status.js
deleted file mode 100644
index 02ecf20424..0000000000
--- a/scripts/release/publish-commands/check-build-status.js
+++ /dev/null
@@ -1,35 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const chalk = require('chalk');
-const {existsSync} = require('fs');
-const {readJson} = require('fs-extra');
-const {join} = require('path');
-
-module.exports = async ({cwd, version, local}) => {
-  if (local) {
-    return;
-  }
-  const packagePath = join(
-    cwd,
-    'build',
-    'node_modules',
-    'react',
-    'package.json'
-  );
-
-  if (!existsSync(packagePath)) {
-    throw Error('No build found');
-  }
-
-  const packageJson = await readJson(packagePath);
-
-  if (packageJson.version !== version) {
-    throw Error(
-      chalk`Expected version {bold.white ${version}} but found {bold.white ${
-        packageJson.version
-      }}`
-    );
-  }
-};
diff --git a/scripts/release/build-commands/check-npm-permissions.js b/scripts/release/publish-commands/check-npm-permissions.js
similarity index 51%
rename from scripts/release/build-commands/check-npm-permissions.js
rename to scripts/release/publish-commands/check-npm-permissions.js
index ceab9c7ffc..8340531005 100644
--- a/scripts/release/build-commands/check-npm-permissions.js
+++ b/scripts/release/publish-commands/check-npm-permissions.js
@@ -2,10 +2,10 @@
 
 'use strict';
 
-const chalk = require('chalk');
 const {execRead, logPromise} = require('../utils');
+const theme = require('../theme');
 
-module.exports = async ({packages}) => {
+const run = async ({cwd, packages, version}) => {
   const currentUser = await execRead('npm whoami');
   const failedProjects = [];
 
@@ -22,19 +22,23 @@ module.exports = async ({packages}) => {
 
   await logPromise(
     Promise.all(packages.map(checkProject)),
-    `Checking ${chalk.yellow.bold(currentUser)}'s NPM permissions`
+    theme`Checking NPM permissions for {underline ${currentUser}}.`
   );
 
   if (failedProjects.length) {
-    throw Error(
-      chalk`
-      Insufficient NPM permissions
-
-      {white NPM user {yellow.bold ${currentUser}} is not an owner for:}
-      {red ${failedProjects.join(', ')}}
-
-      {white Please contact a React team member to be added to the above project(s).}
+    console.error(
+      theme`
+      {error Insufficient NPM permissions}
+      \nNPM user {underline ${currentUser}} is not an owner for: ${failedProjects
+        .map(name => theme.package(name))
+        .join(', ')}
+      \nPlease contact a React team member to be added to the above project(s).
       `
+        .replace(/\n +/g, '\n')
+        .trim()
     );
+    process.exit(1);
   }
 };
+
+module.exports = run;
diff --git a/scripts/release/publish-commands/commit-changelog.js b/scripts/release/publish-commands/commit-changelog.js
deleted file mode 100644
index 448dda5a30..0000000000
--- a/scripts/release/publish-commands/commit-changelog.js
+++ /dev/null
@@ -1,24 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const {exec} = require('child-process-promise');
-const {execRead, logPromise} = require('../utils');
-
-const update = async ({cwd, dry, version}) => {
-  const modifiedFiles = await execRead('git ls-files -m', {cwd});
-
-  if (!dry && modifiedFiles.includes('CHANGELOG.md')) {
-    await exec('git add CHANGELOG.md', {cwd});
-    await exec(
-      `git commit -am "Updating CHANGELOG.md for ${version} release"`,
-      {
-        cwd,
-      }
-    );
-  }
-};
-
-module.exports = async params => {
-  return logPromise(update(params), 'Committing CHANGELOG updates');
-};
diff --git a/scripts/release/publish-commands/confirm-version-and-tags.js b/scripts/release/publish-commands/confirm-version-and-tags.js
new file mode 100644
index 0000000000..bfc5cbcfcc
--- /dev/null
+++ b/scripts/release/publish-commands/confirm-version-and-tags.js
@@ -0,0 +1,46 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const clear = require('clear');
+const {readJson} = require('fs-extra');
+const {join} = require('path');
+const {confirm} = require('../utils');
+const theme = require('../theme');
+
+const run = async ({cwd, packages, tags}) => {
+  clear();
+
+  if (tags.length === 1) {
+    console.log(
+      theme`{spinnerSuccess ✓} You are about the publish the following packages under the tag {tag ${tags}}`
+    );
+  } else {
+    console.log(
+      theme`{spinnerSuccess ✓} You are about the publish the following packages under the tags {tag ${tags.join(
+        ', '
+      )}}`
+    );
+  }
+
+  // Cache all package JSONs for easy lookup below.
+  for (let i = 0; i < packages.length; i++) {
+    const packageName = packages[i];
+    const packageJSONPath = join(
+      cwd,
+      'build/node_modules',
+      packageName,
+      'package.json'
+    );
+    const packageJSON = await readJson(packageJSONPath);
+    console.log(
+      theme`• {package ${packageName}} {version ${packageJSON.version}}`
+    );
+  }
+
+  await confirm('Do you want to proceed?');
+};
+
+// Run this directly because it's fast,
+// and logPromise would interfere with console prompting.
+module.exports = run;
diff --git a/scripts/release/publish-commands/download-error-codes-from-ci.js b/scripts/release/publish-commands/download-error-codes-from-ci.js
new file mode 100644
index 0000000000..d1a64d296e
--- /dev/null
+++ b/scripts/release/publish-commands/download-error-codes-from-ci.js
@@ -0,0 +1,51 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const http = require('request-promise-json');
+const {exec} = require('child-process-promise');
+const {readJsonSync} = require('fs-extra');
+const {logPromise} = require('../utils');
+const theme = require('../theme');
+
+const run = async ({cwd, tags}) => {
+  if (!tags.includes('latest')) {
+    // Don't update error-codes for alphas.
+    return;
+  }
+
+  // All packages are built from a single source revision,
+  // so it is safe to read build info from any one of them.
+  const {buildNumber, environment} = readJsonSync(
+    `${cwd}/build/node_modules/react/build-info.json`
+  );
+
+  // If this release was created on Circle CI, grab the updated error codes from there.
+  // Else the user will have to manually regenerate them.
+  if (environment === 'ci') {
+    // https://circleci.com/docs/2.0/artifacts/#downloading-all-artifacts-for-a-build-on-circleci
+    // eslint-disable-next-line max-len
+    const metadataURL = `https://circleci.com/api/v1.1/project/github/facebook/react/${buildNumber}/artifacts?circle-token=${
+      process.env.CIRCLE_CI_API_TOKEN
+    }`;
+    const metadata = await http.get(metadataURL, true);
+
+    // Each container stores an "error-codes" artifact, unfortunately.
+    // We want to use the one that also ran `yarn build` since it may have modifications.
+    const {node_index} = metadata.find(
+      entry => entry.path === 'home/circleci/project/node_modules.tgz'
+    );
+    const {url} = metadata.find(
+      entry =>
+        entry.node_index === node_index &&
+        entry.path === 'home/circleci/project/scripts/error-codes/codes.json'
+    );
+
+    // Download and stage changers
+    await exec(`curl ${url} --output ./scripts/error-codes/codes.json`, {cwd});
+  }
+};
+
+module.exports = async params => {
+  return logPromise(run(params), theme`Retrieving error codes`);
+};
diff --git a/scripts/release/publish-commands/get-npm-two-factor-auth.js b/scripts/release/publish-commands/get-npm-two-factor-auth.js
deleted file mode 100644
index d32bb8c429..0000000000
--- a/scripts/release/publish-commands/get-npm-two-factor-auth.js
+++ /dev/null
@@ -1,15 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const chalk = require('chalk');
-const logUpdate = require('log-update');
-const prompt = require('prompt-promise');
-
-module.exports = async params => {
-  logUpdate(chalk`{green ✓} Npm two-factor auth code {gray (or blank)}: `);
-  const otp = await prompt('');
-  prompt.done();
-  logUpdate.clear();
-  return otp.trim() || null;
-};
diff --git a/scripts/release/publish-commands/parse-params.js b/scripts/release/publish-commands/parse-params.js
new file mode 100644
index 0000000000..635e22c812
--- /dev/null
+++ b/scripts/release/publish-commands/parse-params.js
@@ -0,0 +1,55 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const commandLineArgs = require('command-line-args');
+const commandLineUsage = require('command-line-usage');
+
+const paramDefinitions = [
+  {
+    name: 'dry',
+    type: Boolean,
+    description: 'Dry run command without actually publishing to NPM.',
+    defaultValue: false,
+  },
+  {
+    name: 'tags',
+    type: String,
+    multiple: true,
+    description: 'NPM tags to point to the new release.',
+  },
+];
+
+module.exports = () => {
+  const params = commandLineArgs(paramDefinitions);
+
+  if (!params.tags || params.tags.length === 0) {
+    const usage = commandLineUsage([
+      {
+        content:
+          'Publishes the current contents of "build/node_modules" to NPM.',
+      },
+      {
+        header: 'Options',
+        optionList: paramDefinitions,
+      },
+      {
+        header: 'Examples',
+        content: [
+          {
+            desc: 'Dry run test:',
+            example: '$ scripts/release/publish.js --dry --tags next',
+          },
+          {
+            desc: 'Publish a new stable:',
+            example: '$ scripts/release/publish.js --tags next latest',
+          },
+        ],
+      },
+    ]);
+    console.log(usage);
+    process.exit(1);
+  }
+
+  return params;
+};
diff --git a/scripts/release/publish-commands/parse-publish-params.js b/scripts/release/publish-commands/parse-publish-params.js
deleted file mode 100644
index c4c7209dce..0000000000
--- a/scripts/release/publish-commands/parse-publish-params.js
+++ /dev/null
@@ -1,57 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const chalk = require('chalk');
-const commandLineArgs = require('command-line-args');
-const commandLineUsage = require('command-line-usage');
-const figlet = require('figlet');
-const {paramDefinitions} = require('../config');
-
-module.exports = () => {
-  const params = commandLineArgs(paramDefinitions);
-
-  if (!params.version) {
-    const usage = commandLineUsage([
-      {
-        content: chalk
-          .hex('#61dafb')
-          .bold(figlet.textSync('react', {font: 'Graffiti'})),
-        raw: true,
-      },
-      {
-        content: 'Automated release publishing script.',
-      },
-      {
-        header: 'Options',
-        optionList: paramDefinitions,
-      },
-      {
-        header: 'Examples',
-        content: [
-          {
-            desc: '1. A concise example.',
-            example: '$ ./publish.js [bold]{-v} [underline]{16.0.0}',
-          },
-          {
-            desc: '2. Dry run publish a release candidate.',
-            example:
-              '$ ./publish.js [bold]{--dry} [bold]{-v} [underline]{16.0.0-rc.0}',
-          },
-          {
-            desc: '3. Release from another checkout.',
-            example:
-              '$ ./publish.js [bold]{--version}=[underline]{16.0.0} [bold]{--path}=/path/to/react/repo',
-          },
-        ],
-      },
-    ]);
-    console.log(usage);
-    process.exit(1);
-  }
-
-  return {
-    ...params,
-    cwd: params.path, // For script convenience
-  };
-};
diff --git a/scripts/release/publish-commands/print-follow-up-instructions.js b/scripts/release/publish-commands/print-follow-up-instructions.js
new file mode 100644
index 0000000000..db3ed9f713
--- /dev/null
+++ b/scripts/release/publish-commands/print-follow-up-instructions.js
@@ -0,0 +1,84 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const clear = require('clear');
+const {readJsonSync} = require('fs-extra');
+const theme = require('../theme');
+
+const run = async ({cwd, packages, tags}) => {
+  // All packages are built from a single source revision,
+  // so it is safe to read the commit number from any one of them.
+  const {commit, environment} = readJsonSync(
+    `${cwd}/build/node_modules/react/build-info.json`
+  );
+
+  // Tags are named after the react version.
+  const {version} = readJsonSync(
+    `${cwd}/build/node_modules/react/package.json`
+  );
+
+  clear();
+
+  console.log(
+    theme.caution`The release has been published but you're not done yet!`
+  );
+
+  if (tags.includes('latest')) {
+    console.log();
+    console.log(
+      theme.header`Please review and commit all local, staged changes.`
+    );
+
+    console.log();
+    console.log('Version numbers have been updated in the following files:');
+    for (let i = 0; i < packages.length; i++) {
+      const packageName = packages[i];
+      console.log(theme.path`• packages/%s/package.json`, packageName);
+    }
+    console.log(theme.path`• packages/shared/ReactVersion.js`);
+
+    console.log();
+    if (environment === 'ci') {
+      console.log('Auto-generated error codes have been updated as well:');
+      console.log(theme.path`• scripts/error-codes/codes.json`);
+    } else {
+      console.log(
+        theme`{caution The release that was just published was created locally.} ` +
+          theme`Because of this, you will need to update the generated ` +
+          theme`{path scripts/error-codes/codes.json} file manually:`
+      );
+      console.log(theme`  {command git checkout} {version ${commit}}`);
+      console.log(theme`  {command yarn build -- --extract-errors}`);
+    }
+  }
+
+  console.log();
+  console.log(
+    theme`{header Don't forget to update and commit the }{path CHANGELOG}`
+  );
+
+  // Prompt the release engineer to tag the commit and update the CHANGELOG.
+  // (The script could automatically do this, but this seems safer.)
+  console.log();
+  console.log(
+    theme.header`Tag the source for this release in Git with the following command:`
+  );
+  console.log(
+    theme`  {command git tag -a v}{version %s} {command -m "v%s"} {version %s}`,
+    version,
+    version,
+    commit
+  );
+  console.log(theme.command`  git push origin --tags`);
+
+  console.log();
+  console.log(theme.header`Lastly, please fill in the release on GitHub:`);
+  console.log(
+    theme.link`https://github.com/facebook/react/releases/tag/v%s`,
+    version
+  );
+  console.log();
+};
+
+module.exports = run;
diff --git a/scripts/release/publish-commands/print-post-publish-summary.js b/scripts/release/publish-commands/print-post-publish-summary.js
deleted file mode 100644
index fc1dfa2541..0000000000
--- a/scripts/release/publish-commands/print-post-publish-summary.js
+++ /dev/null
@@ -1,78 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const chalk = require('chalk');
-const semver = require('semver');
-const {getUnexecutedCommands} = require('../utils');
-
-const printSteps = steps => {
-  return steps
-    .filter(Boolean) // Remove no-op steps
-    .map((step, index) => `${index + 1}. ${step}`)
-    .join('\n');
-};
-
-const printSections = sections => {
-  return sections
-    .map((section, index) => {
-      const [title, ...steps] = section;
-
-      return chalk`
-        {bold.underline Step ${index + 1}: ${title}}
-
-        ${printSteps(steps)}
-      `.replace(/\n +/g, '\n');
-    })
-    .join('');
-};
-
-module.exports = ({dry, version}) => {
-  const isPrerelease = semver.prerelease(version);
-
-  const sections = [];
-
-  // Certain follow-up steps are for stable releases only.
-  if (!isPrerelease) {
-    sections.push([
-      'Create GitHub release',
-      chalk`Open new release page: {blue.bold https://github.com/facebook/react/releases/new}`,
-      chalk`Choose {bold ${version}} from the dropdown menu`,
-      chalk`Paste the new release notes from {yellow.bold CHANGELOG.md}`,
-      chalk`Attach all files in {yellow.bold build/dist/*.js} except {yellow.bold react-art.*} to the release.`,
-      chalk`Press {bold "Publish release"}!`,
-    ]);
-
-    sections.push([
-      'Update the version on reactjs.org',
-      chalk`Git clone (or update) {blue.bold https://github.com/reactjs/reactjs.org}`,
-      chalk`Open the {bold.yellow src/site-constants.js} file`,
-      chalk`Update the {bold version} value to {bold ${version}}`,
-      chalk`Open a Pull Request to {bold master}`,
-    ]);
-  }
-
-  sections.push([
-    'Test the new release',
-    chalk`Install CRA: {bold npm i -g create-react-app}`,
-    chalk`Create a test application: {bold create-react-app myapp && cd myapp}`,
-    isPrerelease
-      ? chalk`Install the pre-release versions: {bold yarn add react@next react-dom@next}`
-      : null,
-    chalk`Run the app: {bold yarn start}`,
-  ]);
-
-  sections.push([
-    'Notify the DOM team',
-    chalk`Notify DOM team members: {bold @nhunzaker @jquense @aweary}`,
-  ]);
-
-  console.log(
-    chalk`
-    {green.bold Publish successful!}
-    ${getUnexecutedCommands()}
-    Next there are a couple of manual steps:
-    ${printSections(sections)}
-  `.replace(/\n +/g, '\n')
-  );
-};
diff --git a/scripts/release/publish-commands/prompt-for-otp.js b/scripts/release/publish-commands/prompt-for-otp.js
new file mode 100644
index 0000000000..c89c288463
--- /dev/null
+++ b/scripts/release/publish-commands/prompt-for-otp.js
@@ -0,0 +1,23 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const prompt = require('prompt-promise');
+const theme = require('../theme');
+
+const run = async () => {
+  while (true) {
+    const otp = await prompt('NPM 2-factor auth code: ');
+    prompt.done();
+
+    if (otp) {
+      return otp;
+    } else {
+      console.log();
+      console.log(theme.error`Two-factor auth is required to publish.`);
+      // (Ask again.)
+    }
+  }
+};
+
+module.exports = run;
diff --git a/scripts/release/publish-commands/publish-to-npm.js b/scripts/release/publish-commands/publish-to-npm.js
index f22525bfd6..34422494ad 100644
--- a/scripts/release/publish-commands/publish-to-npm.js
+++ b/scripts/release/publish-commands/publish-to-npm.js
@@ -2,94 +2,61 @@
 
 'use strict';
 
-const chalk = require('chalk');
-const {readJson} = require('fs-extra');
+const {exec} = require('child-process-promise');
+const {readJsonSync} = require('fs-extra');
 const {join} = require('path');
-const semver = require('semver');
-const {execRead, execUnlessDry, logPromise} = require('../utils');
+const {confirm, execRead} = require('../utils');
+const theme = require('../theme');
 
-const push = async ({cwd, dry, otp, packages, version, tag}) => {
-  const errors = [];
-  const isPrerelease = semver.prerelease(version);
+const run = async ({cwd, dry, packages, tags}, otp) => {
+  for (let i = 0; i < packages.length; i++) {
+    const packageName = packages[i];
+    const packagePath = join(cwd, 'build/node_modules', packageName);
+    const {version} = readJsonSync(join(packagePath, 'package.json'));
 
-  let resolvedTag = tag;
-  if (tag === undefined) {
-    // No tag was provided. Default to `latest` for stable releases and `next`
-    // for prereleases
-    resolvedTag = isPrerelease ? 'next' : 'latest';
-  } else if (tag === 'latest' && isPrerelease) {
-    throw new Error('The tag `latest` can only be used for stable versions.');
-  }
-
-  // Pass two factor auth code if provided:
-  // https://docs.npmjs.com/getting-started/using-two-factor-authentication
-  const twoFactorAuth = otp != null ? `--otp ${otp}` : '';
-
-  const publishProject = async project => {
-    try {
-      const path = join(cwd, 'build', 'node_modules', project);
-      await execUnlessDry(`npm publish --tag ${resolvedTag} ${twoFactorAuth}`, {
-        cwd: path,
-        dry,
-      });
-
-      const packagePath = join(
-        cwd,
-        'build',
-        'node_modules',
-        project,
-        'package.json'
+    // Check if this package version has already been published.
+    // If so we might be resuming from a previous run.
+    // We could infer this by comparing the build-info.json,
+    // But for now the easiest way is just to ask if this is expected.
+    const info = await execRead(`npm view ${packageName}@${version}`);
+    if (info) {
+      console.log(
+        theme`{package ${packageName}} {version ${version}} has already been published.`
+      );
+      await confirm('Is this expected?');
+    } else {
+      console.log(
+        theme`{spinnerSuccess ✓} Publishing {package ${packageName}}`
       );
-      const packageJSON = await readJson(packagePath);
-      const packageVersion = packageJSON.version;
 
+      // Publish the package and tag it.
       if (!dry) {
-        // Wait a couple of seconds before querying NPM for status;
-        // Anecdotally, querying too soon can result in a false negative.
-        await new Promise(resolve => setTimeout(resolve, 5000));
-
-        const status = JSON.parse(
-          await execRead(`npm info ${project} dist-tags --json`)
-        );
-        const remoteVersion = status[resolvedTag];
-
-        // Compare remote version to package.json version,
-        // To better handle the case of pre-release versions.
-        if (remoteVersion !== packageVersion) {
-          throw Error(
-            chalk`Published version {yellow.bold ${packageVersion}} for ` +
-              chalk`{bold ${project}} but NPM shows {yellow.bold ${remoteVersion}}`
-          );
-        }
-
-        // If we've just published a stable release,
-        // Update the @next tag to also point to it (so @next doesn't lag behind).
-        // Skip this step if we have a manually specified tag.
-        // This is an escape hatch for us to interleave alpha and stable releases.
-        if (tag === undefined && !isPrerelease) {
-          await execUnlessDry(
-            `npm dist-tag add ${project}@${packageVersion} next ${twoFactorAuth}`,
-            {cwd: path, dry}
-          );
-        }
+        await exec(`npm publish --tag=${tags[0]} --otp=${otp}`, {
+          cwd: packagePath,
+        });
+      }
+      console.log(theme.command(`  cd ${packagePath}`));
+      console.log(theme.command(`  npm publish --tag=${tags[0]} --otp=${otp}`));
+
+      for (let j = 1; j < tags.length; j++) {
+        if (!dry) {
+          await exec(
+            `npm dist-tag add ${packageName}@${version} ${
+              tags[j]
+            } --otp=${otp}`,
+            {cwd: packagePath}
+          );
+        }
+        console.log(
+          theme.command(
+            `  npm dist-tag add ${packageName}@${version} ${
+              tags[j]
+            } --otp=${otp}`
+          )
+        );
       }
-    } catch (error) {
-      errors.push(error.stack);
     }
-  };
-
-  await Promise.all(packages.map(publishProject));
-
-  if (errors.length > 0) {
-    throw Error(
-      chalk`
-      Failure publishing to NPM
-
-      {white ${errors.join('\n\n')}}`
-    );
   }
 };
 
-module.exports = async params => {
-  return logPromise(push(params), 'Publishing packages to NPM');
-};
+module.exports = run;
diff --git a/scripts/release/publish-commands/push-git-remote.js b/scripts/release/publish-commands/push-git-remote.js
deleted file mode 100644
index 6d487ac546..0000000000
--- a/scripts/release/publish-commands/push-git-remote.js
+++ /dev/null
@@ -1,17 +0,0 @@
-#!/usr/bin/env node
-
-'use strict';
-
-const {execUnlessDry, logPromise} = require('../utils');
-
-const push = async ({cwd, dry}) => {
-  await execUnlessDry('git push', {cwd, dry});
-  await execUnlessDry('git push --tags', {cwd, dry});
-};
-
-module.exports = async params => {
-  if (params.local) {
-    return;
-  }
-  return logPromise(push(params), 'Pushing to git remote');
-};
diff --git a/scripts/release/publish-commands/update-stable-version-numbers.js b/scripts/release/publish-commands/update-stable-version-numbers.js
new file mode 100644
index 0000000000..b94caa43c1
--- /dev/null
+++ b/scripts/release/publish-commands/update-stable-version-numbers.js
@@ -0,0 +1,49 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const {readFileSync, writeFileSync} = require('fs');
+const {readJson, writeJson} = require('fs-extra');
+const {join} = require('path');
+
+const run = async ({cwd, packages, tags}) => {
+  if (!tags.includes('latest')) {
+    // Don't update version numbers for alphas.
+    return;
+  }
+
+  const nodeModulesPath = join(cwd, 'build/node_modules');
+  const packagesPath = join(cwd, 'packages');
+
+  // Update package versions and dependencies (in source) to mirror what was published to NPM.
+  for (let i = 0; i < packages.length; i++) {
+    const packageName = packages[i];
+    const publishedPackageJSON = await readJson(
+      join(nodeModulesPath, packageName, 'package.json')
+    );
+    const sourcePackageJSONPath = join(
+      packagesPath,
+      packageName,
+      'package.json'
+    );
+    const sourcePackageJSON = await readJson(sourcePackageJSONPath);
+    sourcePackageJSON.version = publishedPackageJSON.version;
+    sourcePackageJSON.dependencies = publishedPackageJSON.dependencies;
+    sourcePackageJSON.peerDependencies = publishedPackageJSON.peerDependencies;
+
+    await writeJson(sourcePackageJSONPath, sourcePackageJSON, {spaces: 2});
+  }
+
+  // Update the shared React version source file.
+  const sourceReactVersionPath = join(cwd, 'packages/shared/ReactVersion.js');
+  const {version} = await readJson(
+    join(nodeModulesPath, 'react', 'package.json')
+  );
+  const sourceReactVersion = readFileSync(
+    sourceReactVersionPath,
+    'utf8'
+  ).replace(/module\.exports = '[^']+';/, `module.exports = '${version}';`);
+  writeFileSync(sourceReactVersionPath, sourceReactVersion);
+};
+
+module.exports = run;
diff --git a/scripts/release/publish-commands/validate-tags.js b/scripts/release/publish-commands/validate-tags.js
new file mode 100644
index 0000000000..0021511da3
--- /dev/null
+++ b/scripts/release/publish-commands/validate-tags.js
@@ -0,0 +1,29 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const {readJson} = require('fs-extra');
+const {join} = require('path');
+const theme = require('../theme');
+
+const run = async ({cwd, packages, tags}) => {
+  // Prevent a canary release from ever being published as @latest
+  const packageJSONPath = join(
+    cwd,
+    'build',
+    'node_modules',
+    'react',
+    'package.json'
+  );
+  const {version} = await readJson(packageJSONPath);
+  if (version.indexOf('0.0.0') === 0) {
+    if (tags.includes('latest')) {
+      console.log(
+        theme`{error Canary release} {version ${version}} {error cannot be tagged as} {tag latest}`
+      );
+      process.exit(1);
+    }
+  }
+};
+
+module.exports = run;
diff --git a/scripts/release/publish.js b/scripts/release/publish.js
index c3d980b0f2..4923204a13 100755
--- a/scripts/release/publish.js
+++ b/scripts/release/publish.js
@@ -2,43 +2,35 @@
 
 'use strict';
 
-const chalk = require('chalk');
-const logUpdate = require('log-update');
-const {getPublicPackages} = require('./utils');
+const {join} = require('path');
+const {getPublicPackages, handleError} = require('./utils');
 
-const checkBuildStatus = require('./publish-commands/check-build-status');
-const commitChangelog = require('./publish-commands/commit-changelog');
-const getNpmTwoFactorAuth = require('./publish-commands/get-npm-two-factor-auth');
-const parsePublishParams = require('./publish-commands/parse-publish-params');
-const printPostPublishSummary = require('./publish-commands/print-post-publish-summary');
-const pushGitRemote = require('./publish-commands/push-git-remote');
-const publishToNpm = require('./publish-commands/publish-to-npm');
+const checkNPMPermissions = require('./publish-commands/check-npm-permissions');
+const confirmVersionAndTags = require('./publish-commands/confirm-version-and-tags');
+const downloadErrorCodesFromCI = require('./publish-commands/download-error-codes-from-ci');
+const parseParams = require('./publish-commands/parse-params');
+const printFollowUpInstructions = require('./publish-commands/print-follow-up-instructions');
+const promptForOTP = require('./publish-commands/prompt-for-otp');
+const publishToNPM = require('./publish-commands/publish-to-npm');
+const updateStableVersionNumbers = require('./publish-commands/update-stable-version-numbers');
+const validateTags = require('./publish-commands/validate-tags');
 
-// Follows the steps outlined in github.com/facebook/react/issues/10620
 const run = async () => {
-  const params = parsePublishParams();
-  params.packages = getPublicPackages();
-
   try {
-    await checkBuildStatus(params);
-    await commitChangelog(params);
-    await pushGitRemote(params);
-    params.otp = await getNpmTwoFactorAuth(params);
-    await publishToNpm(params);
-    await printPostPublishSummary(params);
+    const params = parseParams();
+    params.cwd = join(__dirname, '..', '..');
+    params.packages = await getPublicPackages();
+
+    await validateTags(params);
+    await confirmVersionAndTags(params);
+    await checkNPMPermissions(params);
+    const otp = await promptForOTP(params);
+    await publishToNPM(params, otp);
+    await downloadErrorCodesFromCI(params);
+    await updateStableVersionNumbers(params);
+    await printFollowUpInstructions(params);
   } catch (error) {
-    logUpdate.clear();
-
-    const message = error.message.trim().replace(/\n +/g, '\n');
-    const stack = error.stack.replace(error.message, '');
-
-    console.log(
-      `${chalk.bgRed.white(' ERROR ')} ${chalk.red(message)}\n\n${chalk.gray(
-        stack
-      )}`
-    );
-
-    process.exit(1);
+    handleError(error);
   }
 };
 
diff --git a/scripts/release/shared-commands/print-prerelease-summary.js b/scripts/release/shared-commands/print-prerelease-summary.js
new file mode 100644
index 0000000000..e68d014745
--- /dev/null
+++ b/scripts/release/shared-commands/print-prerelease-summary.js
@@ -0,0 +1,38 @@
+#!/usr/bin/env node
+
+'use strict';
+
+const clear = require('clear');
+const {join, relative} = require('path');
+const theme = require('../theme');
+
+module.exports = ({cwd}) => {
+  const publishPath = relative(
+    process.env.PWD,
+    join(__dirname, '../publish.js')
+  );
+
+  clear();
+
+  console.log(
+    theme`
+    {caution A release candidate has been prepared but you're not done yet!}
+
+    You can review the contents of this release in {path ./build/node_modules/}
+
+    {header Before publishing, please smoke test the packages!}
+
+    1. Open {path ./fixtures/packaging/babel-standalone/dev.html} in the browser.
+    2. It should say {quote "Hello world!"}
+    3. Next go to {path ./fixtures/packaging} and run {command node build-all.js}
+    4. Go to the repo root and {command npx pushstate-server . 9000}
+    5. Open {link http://localhost:9000/fixtures/packaging}
+    6. Verify every iframe shows {quote "Hello world!"}
+
+    After completing the above steps, you can publish this release by running:
+    {path   ${publishPath}}
+  `
+      .replace(/\n +/g, '\n')
+      .trim()
+  );
+};
diff --git a/scripts/release/theme.js b/scripts/release/theme.js
new file mode 100644
index 0000000000..5c23185cba
--- /dev/null
+++ b/scripts/release/theme.js
@@ -0,0 +1,35 @@
+'use strict';
+
+const chalk = require('chalk');
+
+const colors = {
+  blue: '#0091ea',
+  gray: '#78909c',
+  green: '#00c853',
+  red: '#d50000',
+  yellow: '#ffd600',
+};
+
+const theme = chalk.constructor();
+theme.package = theme.hex(colors.green);
+theme.version = theme.hex(colors.yellow);
+theme.tag = theme.hex(colors.yellow);
+theme.build = theme.hex(colors.yellow);
+theme.error = theme.hex(colors.red).bold;
+theme.dimmed = theme.hex(colors.gray);
+theme.caution = theme.hex(colors.red).bold;
+theme.link = theme.hex(colors.blue).underline.italic;
+theme.header = theme.hex(colors.green).bold;
+theme.path = theme.hex(colors.gray).italic;
+theme.command = theme.hex(colors.gray);
+theme.quote = theme.italic;
+
+theme.diffHeader = theme.hex(colors.gray);
+theme.diffAdded = theme.hex(colors.green);
+theme.diffRemoved = theme.hex(colors.red);
+
+theme.spinnerInProgress = theme.hex(colors.yellow);
+theme.spinnerError = theme.hex(colors.red);
+theme.spinnerSuccess = theme.hex(colors.green);
+
+module.exports = theme;
diff --git a/scripts/release/utils.js b/scripts/release/utils.js
index 2a9ecff5e8..0e3838730d 100644
--- a/scripts/release/utils.js
+++ b/scripts/release/utils.js
@@ -1,11 +1,24 @@
 'use strict';
 
-const chalk = require('chalk');
 const {dots} = require('cli-spinners');
 const {exec} = require('child-process-promise');
-const {readdirSync, readFileSync, statSync} = require('fs');
+const {createPatch} = require('diff');
+const {hashElement} = require('folder-hash');
+const {readdirSync, readFileSync, statSync, writeFileSync} = require('fs');
+const {readJson, writeJson} = require('fs-extra');
 const logUpdate = require('log-update');
 const {join} = require('path');
+const prompt = require('prompt-promise');
+const theme = require('./theme');
+
+const confirm = async message => {
+  const confirmation = await prompt(theme`\n{caution ${message}} (y/N) `);
+  prompt.done();
+  if (confirmation !== 'y' && confirmation !== 'Y') {
+    console.log(theme`\n{caution Release cancelled.}`);
+    process.exit(0);
+  }
+};
 
 const execRead = async (command, options) => {
   const {stdout} = await exec(command, options);
@@ -13,31 +26,37 @@ const execRead = async (command, options) => {
   return stdout.trim();
 };
 
-const unexecutedCommands = [];
+const getBuildInfo = async () => {
+  const cwd = join(__dirname, '..', '..');
 
-const execUnlessDry = async (command, {cwd, dry}) => {
-  if (dry) {
-    unexecutedCommands.push(`${command} # {cwd: ${cwd}}`);
-  } else {
-    await exec(command, {cwd});
-  }
+  const branch = await execRead('git branch | grep \\* | cut -d " " -f2', {
+    cwd,
+  });
+  const commit = await execRead('git show -s --format=%h', {cwd});
+  const checksum = await getChecksumForCurrentRevision(cwd);
+  const version = `0.0.0-${commit}`;
+
+  // Only available for Circle CI builds.
+  // https://circleci.com/docs/2.0/env-vars/
+  const buildNumber = process.env.CIRCLE_BUILD_NUM;
+
+  // React version is stored explicitly, separately for DevTools support.
+  // See updateVersionsForCanary() below for more info.
+  const packageJSON = await readJson(
+    join(cwd, 'packages', 'react', 'package.json')
+  );
+  const reactVersion = `${packageJSON.version}-canary-${commit}`;
+
+  return {branch, buildNumber, checksum, commit, reactVersion, version};
 };
 
-const getPackages = () => {
-  const packagesRoot = join(__dirname, '..', '..', 'packages');
-
-  return readdirSync(packagesRoot).filter(dir => {
-    const packagePath = join(packagesRoot, dir, 'package.json');
-
-    if (dir.charAt(0) !== '.' && statSync(packagePath).isFile()) {
-      const packageJSON = JSON.parse(readFileSync(packagePath));
-
-      // Skip packages like "shared" and "events" that shouldn't be updated.
-      return packageJSON.version !== '0.0.0';
-    }
-
-    return false;
+const getChecksumForCurrentRevision = async cwd => {
+  const packagesDir = join(cwd, 'packages');
+  const hashedPackages = await hashElement(packagesDir, {
+    encoding: 'hex',
+    files: {exclude: ['.DS_Store']},
   });
+  return hashedPackages.hash.slice(0, 7);
 };
 
 const getPublicPackages = () => {
@@ -56,15 +75,15 @@ const getPublicPackages = () => {
   });
 };
 
-const getUnexecutedCommands = () => {
-  if (unexecutedCommands.length > 0) {
-    return chalk`
-      The following commands were not executed because of the {bold --dry} flag:
-      {gray ${unexecutedCommands.join('\n')}}
-    `;
-  } else {
-    return '';
-  }
+const handleError = error => {
+  logUpdate.clear();
+
+  const message = error.message.trim().replace(/\n +/g, '\n');
+  const stack = error.stack.replace(error.message, '');
+
+  console.log(theme`{error ${message}}\n\n{path ${stack}}`);
+
+  process.exit(1);
 };
 
 const logPromise = async (promise, text, isLongRunningTask = false) => {
@@ -79,7 +98,9 @@ const logPromise = async (promise, text, isLongRunningTask = false) => {
   const id = setInterval(() => {
     index = ++index % frames.length;
     logUpdate(
-      `${chalk.yellow(frames[index])} ${text} ${chalk.gray(inProgressMessage)}`
+      theme`{spinnerInProgress ${
+        frames[index]
+      }} ${text} {dimmed ${inProgressMessage}}`
     );
   }, interval);
 
@@ -88,7 +109,7 @@ const logPromise = async (promise, text, isLongRunningTask = false) => {
 
     clearInterval(id);
 
-    logUpdate(`${chalk.green('✓')} ${text}`);
+    logUpdate(theme`{spinnerSuccess ✓} ${text}`);
     logUpdate.done();
 
     return returnValue;
@@ -99,26 +120,103 @@ const logPromise = async (promise, text, isLongRunningTask = false) => {
   }
 };
 
-const runYarnTask = async (cwd, task, errorMessage) => {
-  try {
-    await exec(`yarn ${task}`, {cwd});
-  } catch (error) {
-    throw Error(
-      chalk`
-      ${errorMessage}
+const printDiff = (path, beforeContents, afterContents) => {
+  const patch = createPatch(path, beforeContents, afterContents);
+  const coloredLines = patch
+    .split('\n')
+    .slice(2) // Trim index file
+    .map((line, index) => {
+      if (index <= 1) {
+        return theme.diffHeader(line);
+      }
+      switch (line[0]) {
+        case '+':
+          return theme.diffAdded(line);
+        case '-':
+          return theme.diffRemoved(line);
+        case ' ':
+          return line;
+        case '@':
+          return null;
+        case '\\':
+          return null;
+      }
+    })
+    .filter(line => line);
+  console.log(coloredLines.join('\n'));
+  return patch;
+};
 
-      {white ${error.stdout}}
-    `
-    );
+// This method is used by both local Node release scripts and Circle CI bash scripts.
+// It updates version numbers in package JSONs (both the version field and dependencies),
+// As well as the embedded renderer version in "packages/shared/ReactVersion".
+// Canaries version numbers use the format of 0.0.0-<sha> to be easily recognized (e.g. 0.0.0-57239eac8).
+// A separate "React version" is used for the embedded renderer version to support DevTools,
+// since it needs to distinguish between different version ranges of React.
+// It is based on the version of React in the local package.json (e.g. 16.6.1-canary-57239eac8).
+// Both numbers will be replaced if the canary is promoted to a stable release.
+const updateVersionsForCanary = async (cwd, reactVersion, version) => {
+  const packages = getPublicPackages(join(cwd, 'packages'));
+  const packagesDir = join(cwd, 'packages');
+
+  // Update the shared React version source file.
+  // This is bundled into built renderers.
+  // The promote script will replace this with a final version later.
+  const sourceReactVersionPath = join(cwd, 'packages/shared/ReactVersion.js');
+  const sourceReactVersion = readFileSync(
+    sourceReactVersionPath,
+    'utf8'
+  ).replace(
+    /module\.exports = '[^']+';/,
+    `module.exports = '${reactVersion}';`
+  );
+  writeFileSync(sourceReactVersionPath, sourceReactVersion);
+
+  // Update the root package.json.
+  // This is required to pass a later version check script.
+  {
+    const packageJSONPath = join(cwd, 'package.json');
+    const packageJSON = await readJson(packageJSONPath);
+    packageJSON.version = version;
+    await writeJson(packageJSONPath, packageJSON, {spaces: 2});
+  }
+
+  for (let i = 0; i < packages.length; i++) {
+    const packageName = packages[i];
+    const packagePath = join(packagesDir, packageName);
+
+    // Update version numbers in package JSONs
+    const packageJSONPath = join(packagePath, 'package.json');
+    const packageJSON = await readJson(packageJSONPath);
+    packageJSON.version = version;
+
+    // Also update inter-package dependencies.
+    // Canary releases always have exact version matches.
+    // The promote script may later relax these (e.g. "^x.x.x") based on source package JSONs.
+    const {dependencies, peerDependencies} = packageJSON;
+    for (let j = 0; j < packages.length; j++) {
+      const dependencyName = packages[j];
+      if (dependencies && dependencies[dependencyName]) {
+        dependencies[dependencyName] = version;
+      }
+      if (peerDependencies && peerDependencies[dependencyName]) {
+        peerDependencies[dependencyName] = version;
+      }
+    }
+
+    await writeJson(packageJSONPath, packageJSON, {spaces: 2});
   }
 };
 
 module.exports = {
+  confirm,
   execRead,
-  execUnlessDry,
-  getPackages,
+  getBuildInfo,
+  getChecksumForCurrentRevision,
   getPublicPackages,
-  getUnexecutedCommands,
+  handleError,
   logPromise,
-  runYarnTask,
+  printDiff,
+  theme,
+  updateVersionsForCanary,
 };
diff --git a/scripts/release/yarn.lock b/scripts/release/yarn.lock
index 44ea4e5703..f46257a8e5 100644
--- a/scripts/release/yarn.lock
+++ b/scripts/release/yarn.lock
@@ -63,6 +63,11 @@ aws4@^1.6.0:
   version "1.6.0"
   resolved "https://registry.yarnpkg.com/aws4/-/aws4-1.6.0.tgz#83ef5ca860b2b32e4a0deedee8c771b9db57471e"
 
+balanced-match@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
+  integrity sha1-ibTRmasr7kneFk6gK4nORi1xt2c=
+
 bcrypt-pbkdf@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.1.tgz#63bc5dcb61331b92bc05fd528953c33462a06f8d"
@@ -81,6 +86,14 @@ boom@5.x.x:
   dependencies:
     hoek "4.x.x"
 
+brace-expansion@^1.1.7:
+  version "1.1.11"
+  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"
+  integrity sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==
+  dependencies:
+    balanced-match "^1.0.0"
+    concat-map "0.0.1"
+
 caseless@~0.12.0:
   version "0.12.0"
   resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.12.0.tgz#1b681c21ff84033c826543090689420d187151dc"
@@ -101,6 +114,11 @@ child-process-promise@^2.2.1:
     node-version "^1.0.0"
     promise-polyfill "^6.0.1"
 
+clear@^0.1.0:
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/clear/-/clear-0.1.0.tgz#b81b1e03437a716984fd7ac97c87d73bdfe7048a"
+  integrity sha512-qMjRnoL+JDPJHeLePZJuao6+8orzHMGP04A8CdwCNsKhRbOnKRjefxONR7bwILT3MHecxKBjHkKL/tkZ8r4Uzw==
+
 cli-cursor@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/cli-cursor/-/cli-cursor-2.1.0.tgz#b35dac376479facc3e94747d41d0d0f5238ffcb5"
@@ -148,6 +166,11 @@ command-line-usage@^4.0.1:
     table-layout "^0.4.1"
     typical "^2.6.1"
 
+concat-map@0.0.1:
+  version "0.0.1"
+  resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
+  integrity sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=
+
 core-util-is@1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
@@ -171,6 +194,13 @@ dashdash@^1.12.0:
   dependencies:
     assert-plus "^1.0.0"
 
+debug@^3.1.0:
+  version "3.2.6"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-3.2.6.tgz#e83d17de16d8a7efb7717edbe5fb10135eee629b"
+  integrity sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==
+  dependencies:
+    ms "^2.1.1"
+
 deep-extend@~0.5.0:
   version "0.5.0"
   resolved "https://registry.yarnpkg.com/deep-extend/-/deep-extend-0.5.0.tgz#6ef4a09b05f98b0e358d6d93d4ca3caec6672803"
@@ -179,6 +209,11 @@ delayed-stream@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/delayed-stream/-/delayed-stream-1.0.0.tgz#df3ae199acadfb7d440aaae0b29e2272b24ec619"
 
+diff@^3.5.0:
+  version "3.5.0"
+  resolved "https://registry.yarnpkg.com/diff/-/diff-3.5.0.tgz#800c0dd1e0a8bfbc95835c202ad220fe317e5a12"
+  integrity sha512-A46qtFgd+g7pDZinpnwiRJtxbC1hpgf0uzP3iG89scHk0AUC7A1TGxf5OiiOUv/JMZR8GOt8hL900hV0bOy5xA==
+
 ecc-jsbn@~0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/ecc-jsbn/-/ecc-jsbn-0.1.1.tgz#0fc73a9ed5f0d53c38193398523ef7e543777505"
@@ -201,10 +236,6 @@ fast-deep-equal@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-1.0.0.tgz#96256a3bc975595eb36d82e9929d060d893439ff"
 
-figlet@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/figlet/-/figlet-1.2.0.tgz#6c46537378fab649146b5a6143dda019b430b410"
-
 find-replace@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/find-replace/-/find-replace-1.0.3.tgz#b88e7364d2d9c959559f388c66670d6130441fa0"
@@ -212,6 +243,15 @@ find-replace@^1.0.3:
     array-back "^1.0.4"
     test-value "^2.1.0"
 
+folder-hash@^2.1.2:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/folder-hash/-/folder-hash-2.1.2.tgz#7109f9cd0cbca271936d1b5544b156d6571e6cfd"
+  integrity sha512-PmMwEZyNN96EMshf7sek4OIB7ADNsHOJ7VIw7pO0PBI0BNfEsi7U8U56TBjjqqwQ0WuBv8se0HEfmbw5b/Rk+w==
+  dependencies:
+    debug "^3.1.0"
+    graceful-fs "~4.1.11"
+    minimatch "~3.0.4"
+
 forever-agent@~0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/forever-agent/-/forever-agent-0.6.1.tgz#fbc71f0c41adeb37f96c577ad1ed42d8fdacca91"
@@ -242,6 +282,11 @@ graceful-fs@^4.1.2, graceful-fs@^4.1.6:
   version "4.1.11"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.11.tgz#0e8bdfe4d1ddb8854d64e04ea7c00e2a026e5658"
 
+graceful-fs@~4.1.11:
+  version "4.1.15"
+  resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.15.tgz#ffb703e1066e8a0eeaa4c8b80ba9253eeefbfb00"
+  integrity sha512-6uHUhOPEBgQ24HM+r6b/QwWfZq+yiFcipKFrOFiBEnWdy5sdzYoi+pJeQaPI5qOLRFqWmAXUPQNsielzdLoecA==
+
 har-schema@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/har-schema/-/har-schema-2.0.0.tgz#a94c2224ebcac04782a0d9035521f24735b7ec92"
@@ -372,6 +417,18 @@ mimic-fn@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/mimic-fn/-/mimic-fn-1.1.0.tgz#e667783d92e89dbd342818b5230b9d62a672ad18"
 
+minimatch@~3.0.4:
+  version "3.0.4"
+  resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.4.tgz#5166e286457f03306064be5497e8dbb0c3d32083"
+  integrity sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==
+  dependencies:
+    brace-expansion "^1.1.7"
+
+ms@^2.1.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.1.tgz#30a5864eb3ebb0a66f2ebe6d727af06a09d86e0a"
+  integrity sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==
+
 native-or-another@~2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/native-or-another/-/native-or-another-2.0.0.tgz#17a567f92beea9cd71acff96a7681a735eca3bff"