refactor: port to-lines to ts

@commitlint/to-lines/jest.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+	preset: 'ts-jest',
+	testEnvironment: 'node'
+};

@commitlint/to-lines/package.json

@@ -7,31 +7,12 @@
     "lib/"
   ],
   "scripts": {
-    "build": "cross-env NODE_ENV=production babel src --out-dir lib  --source-maps",
+    "build": "tsc",
     "deps": "dep-check",
     "pkg": "pkg-check",
-    "start": "concurrently \"ava -c 4 --verbose --watch\" \"yarn run watch\"",
-    "test": "ava -c 4 --verbose",
-    "watch": "babel src --out-dir lib --watch --source-maps"
-  },
-  "ava": {
-    "files": [
-      "src/**/*.test.js",
-      "!lib/**/*"
-    ],
-    "source": [
-      "src/**/*.js",
-      "!lib/**/*"
-    ],
-    "babel": "inherit",
-    "require": [
-      "babel-register"
-    ]
-  },
-  "babel": {
-    "presets": [
-      "babel-preset-commitlint"
-    ]
+    "start": "concurrently \"yarn test --watchAll\" \"yarn run watch\"",
+    "test": "jest",
+    "watch": "tsc -w"
   },
   "engines": {
     "node": ">=4"
@@ -57,13 +38,11 @@
   "license": "MIT",
   "devDependencies": {
     "@commitlint/parse": "^8.0.0",
-    "@commitlint/test": "8.0.0",
     "@commitlint/utils": "^8.0.0",
-    "ava": "0.22.0",
-    "babel-cli": "6.26.0",
-    "babel-preset-commitlint": "^8.0.0",
-    "babel-register": "6.26.0",
     "concurrently": "3.5.1",
-    "cross-env": "5.1.1"
+    "@types/jest": "^24.0.13",
+    "jest": "^24.8.0",
+    "ts-jest": "^24.0.2",
+    "typescript": "^3.4.5"
   }
-}
+}

@commitlint/to-lines/src/index.test.ts

@@ -0,0 +1,21 @@
+import toLines from '.';
+
+test('should return an array for empty input', () => {
+	expect((toLines as () => string[])()).toStrictEqual([]);
+});
+
+test('should return an array for null input', () => {
+	expect((toLines as (input: any) => string[])(null)).toStrictEqual([]);
+});
+
+test('should return an array for empty string input', () => {
+	expect(toLines('')).toStrictEqual(['']);
+});
+
+test('should split LF newlines', () => {
+	expect(toLines('some\nweird\ntext')).toStrictEqual(['some', 'weird', 'text']);
+});
+
+test('should split CR+LF newlines', () => {
+	expect(toLines('some\r\nweird\r\ntext')).toStrictEqual(['some', 'weird', 'text']);
+});

@commitlint/to-lines/src/index.js → @commitlint/to-lines/src/index.ts

@@ -1,4 +1,4 @@
-export default function toLines(input) {
+export default function toLines(input: string): string[] {
 	if (typeof input !== 'string') {
 		return [];
 	}

@commitlint/to-lines/tsconfig.json

@@ -0,0 +1,22 @@
+{
+	"compilerOptions": {
+		"lib": [
+			"dom",
+			"es2015"
+		],
+		"rootDir": "src",
+		"outDir": "lib",
+		"declaration": true,
+		"declarationMap": true,
+		"sourceMap": true,
+		"esModuleInterop": true,
+		"allowSyntheticDefaultImports": true,
+		"strict": true
+	},
+	"include": [
+		"./src"
+	],
+	"exclude": [
+		"./src/**/*.test.ts"
+	]
+}