Create a package

.gitignore

@@ -65,3 +65,4 @@ fastlane/report.xml
 fastlane/Preview.html
 fastlane/screenshots
 fastlane/test_output
+JSONDecoder-Keypath.xcodeproj

.swift-version

@@ -0,0 +1,2 @@
+4.0
+

.swiftlint.yml

@@ -0,0 +1,41 @@
+included: # paths to include during linting. `--path` is ignored if present.
+  - Sources
+  - Tests
+excluded: # paths to ignore during linting. Takes precedence over `included`.
+  - Carthage
+  - Pods
+reporter: "xcode" # reporter type (xcode, json, csv, checkstyle)
+
+disabled_rules: # rule identifiers to exclude from running
+  - line_length
+  - todo
+  - nesting
+opt_in_rules: # some rules are only opt-in
+  - empty_count
+  - explicit_init
+  - closure_spacing
+  - overridden_super_call
+  - redundant_nil_coalescing
+  - private_outlet
+  - operator_usage_whitespace
+  - first_where
+  - fatal_error_message
+  - vertical_parameter_alignment_on_call
+  - unneeded_parentheses_in_closure_argument
+  - extension_access_modifier
+  - pattern_matching_keywords
+  - force_unwrapping
+  
+
+# configurable rules can be customized from this configuration file
+# binary rules can set their severity level
+trailing_whitespace:
+    ignores_empty_lines: true
+    ignores_comments: true
+
+vertical_whitespace: # Limit vertical whitespace to a single empty line.
+    max_empty_lines: 2
+
+identifier_name:
+  excluded:
+    - id

Package.swift

@@ -0,0 +1,29 @@
+// swift-tools-version:4.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(    
+    name: "JSONDecoder-Keypath",
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "JSONDecoder-Keypath",
+            targets: ["JSONDecoder-Keypath"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "JSONDecoder-Keypath",
+            dependencies: []),
+        .testTarget(
+            name: "JSONDecoder-KeypathTests",
+            dependencies: ["JSONDecoder-Keypath"]),
+    ],
+    swiftLanguageVersions: [4]
+)

Sources/JSONDecoder-Keypath/JSONDecoder_Keypath.swift

@@ -0,0 +1,3 @@
+struct JSONDecoder_Keypath {
+    var text = "Hello, World!"
+}

Tests/JSONDecoder-KeypathTests/JSONDecoder_KeypathTests.swift

@@ -0,0 +1,16 @@
+import XCTest
+@testable import JSONDecoder_Keypath
+
+class JSONDecoder_KeypathTests: XCTestCase {
+    func testExample() {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct
+        // results.
+        XCTAssertEqual(JSONDecoder_Keypath().text, "Hello, World!")
+    }
+
+
+    static var allTests = [
+        ("testExample", testExample),
+    ]
+}

Tests/LinuxMain.swift

@@ -0,0 +1,6 @@
+import XCTest
+@testable import JSONDecoder_KeypathTests
+
+XCTMain([
+    testCase(JSONDecoder_KeypathTests.allTests),
+])