refactor(cli): port cli to typescript

Author: armano2

@commitlint/cli/package.json

@@ -11,19 +11,8 @@
     "commitlint": "./lib/cli.js"
   },
   "scripts": {
-    "build": "cross-env NODE_ENV=production babel src --out-dir lib --source-maps",
     "deps": "dep-check",
-    "pkg": "pkg-check",
-    "start": "yarn run watch",
-    "watch": "babel src --out-dir lib --watch --source-maps"
-  },
-  "babel": {
-    "presets": [
-      "babel-preset-commitlint"
-    ],
-    "ignore": [
-      "**/*.test.js"
-    ]
+    "pkg": "pkg-check"
   },
   "engines": {
     "node": ">=8"
@@ -47,12 +36,7 @@
   },
   "license": "MIT",
   "devDependencies": {
-    "@babel/cli": "^7.7.7",
-    "@babel/core": "^7.7.7",
-    "@commitlint/test": "8.2.0",
-    "@commitlint/utils": "^8.3.4",
-    "babel-preset-commitlint": "^8.2.0",
-    "cross-env": "7.0.0",
+    "@types/yargs": "^15.0.3",
     "execa": "0.11.0",
     "fs-extra": "^8.1.0"
   },
@@ -62,12 +46,10 @@
     "@commitlint/load": "^8.3.5",
     "@commitlint/read": "^8.3.4",
     "chalk": "3.0.0",
-    "core-js": "^3.6.1",
     "get-stdin": "7.0.0",
     "lodash": "^4.17.15",
-    "meow": "5.0.0",
-    "regenerator-runtime": "0.13.3",
     "resolve-from": "5.0.0",
-    "resolve-global": "1.0.0"
+    "resolve-global": "1.0.0",
+    "yargs": "^15.1.0"
   }
 }

@commitlint/cli/src/cli.test.js renamed to @commitlint/cli/src/cli.test.ts

@@ -6,7 +6,12 @@ import fs from 'fs-extra';
 
 const bin = require.resolve('../lib/cli.js');
 
-const cli = (args, options) => {
+interface TestOptions {
+	cwd: string;
+	env?: Record<string, string>;
+}
+
+function cli(args: string[], options: TestOptions) {
 	return (input = '') => {
 		const c = execa(bin, args, {
 			cwd: options.cwd,
@@ -15,10 +20,10 @@ const cli = (args, options) => {
 		});
 		return c.catch(err => err);
 	};
-};
+}
 
-const gitBootstrap = fixture => git.bootstrap(fixture, __dirname);
-const fixBootstrap = fixture => fix.bootstrap(fixture, __dirname);
+const gitBootstrap = (fixture: string) => git.bootstrap(fixture, __dirname);
+const fixBootstrap = (fixture: string) => fix.bootstrap(fixture, __dirname);
 
 test('should throw when called without [input]', async () => {
 	const cwd = await gitBootstrap('fixtures/default');
@@ -423,7 +428,7 @@ test('should work with relative formatter path', async () => {
 	expect(actual.code).toBe(0);
 });
 
-async function writePkg(payload, options) {
+async function writePkg(payload: unknown, options: TestOptions) {
 	const pkgPath = path.join(options.cwd, 'package.json');
 	const pkg = JSON.parse(await fs.readFile(pkgPath, 'utf-8'));
 	const result = merge(pkg, payload);