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hax to make jest fast 

Turns out jest is _incredibly_ slow at resolving require paths like `require('fbjs/lib/foo')`. Like several milliseconds per require. Really adds up when all our files require `invariant` and `warning`. Here's a temporary hack to make things fast again.

Test Plan:
```
npm test src/renderers/shared/reconciler/__tests__/ReactCompositeComponent-test.js
```

has a self-proclaimed runtime of ~8 seconds now instead of ~35 seconds.
This commit is contained in:
Ben Alpert 2015-08-18 21:31:32 -07:00
parent 4a92860b00
commit a8b6c8292b
1 changed files with 25 additions and 7 deletions
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32
scripts/jest/preprocessor.js
View File

@ -1,5 +1,7 @@
'use strict';
var path = require('path');
var babel = require('babel');
var coffee = require('coffee-script');
@ -19,15 +21,16 @@ var babelPluginDEV = require('fbjs/scripts/babel/dev-expression');
var babelPluginModules = require('fbjs/scripts/babel/rewrite-modules');
module.exports = {
process: function(src, path) {
if (path.match(/\.coffee$/)) {
process: function(src, filePath) {
if (filePath.match(/\.coffee$/)) {
return coffee.compile(src, {'bare': true});
}
if (path.match(/\.ts$/) && !path.match(/\.d\.ts$/)) {
return ts.compile(src, path);
if (filePath.match(/\.ts$/) && !filePath.match(/\.d\.ts$/)) {
return ts.compile(src, filePath);
}
// TODO: make sure this stays in sync with gulpfile
if (!path.match(/\/node_modules\//) && !path.match(/\/third_party\//)) {
if (!filePath.match(/\/node_modules\//) &&
!filePath.match(/\/third_party\//)) {
var rv = babel.transform(src, {
nonStandard: true,
blacklist: [
@ -38,11 +41,26 @@ module.exports = {
'es7.trailingFunctionCommas',
],
plugins: [babelPluginDEV, babelPluginModules],
ignore: ['third_party'],
filename: path,
filename: filePath,
retainLines: true,
_moduleMap: moduleMap,
}).code;
// hax to turn fbjs/lib/foo into /path/to/node_modules/fbjs/lib/foo
// because jest is slooow with node_modules paths (facebook/jest#465)
rv = rv.replace(
/require\('(fbjs\/lib\/.+)'\)/g,
function(call, arg) {
return (
'require(' +
JSON.stringify(
path.join(__dirname, '../../node_modules', arg)
) +
')'
);
}
);
return rv;
}
return src;