refactor(cli): port cli to typescript

@commitlint/cli/cli.js

@@ -0,0 +1,2 @@
+#!/usr/bin/env node
+require('./lib/cli.js');

@commitlint/cli/index.js

@@ -1,3 +1,3 @@
 const path = require('path');
 
-module.exports = path.join(__dirname, 'lib/cli.js');
+module.exports = path.join(__dirname, 'cli.js');

@commitlint/cli/package.json

@@ -4,26 +4,15 @@
   "description": "Lint your commit messages",
   "files": [
     "index.js",
-    "lib",
-    "!*.test.js*"
+    "cli.js",
+    "lib"
   ],
   "bin": {
-    "commitlint": "./lib/cli.js"
+    "commitlint": "./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 +36,9 @@
   },
   "license": "MIT",
   "devDependencies": {
-    "@babel/cli": "^7.7.7",
-    "@babel/core": "^7.7.7",
+    "@types/yargs": "^15.0.3",
     "@commitlint/test": "8.2.0",
     "@commitlint/utils": "^8.3.4",
-    "babel-preset-commitlint": "^8.2.0",
-    "cross-env": "7.0.0",
     "execa": "^3.4.0",
     "fs-extra": "^8.1.0"
   },
@@ -62,12 +48,10 @@
     "@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-error.ts

@@ -0,0 +1,13 @@
+export class CliError extends Error {
+	__proto__ = Error;
+
+	public type: string;
+
+	constructor(message: string, type: string) {
+		super(message);
+
+		this.type = type;
+
+		Object.setPrototypeOf(this, CliError.prototype);
+	}
+}

@commitlint/cli/src/cli.test.js → @commitlint/cli/src/cli.test.ts

@@ -4,9 +4,14 @@ import execa from 'execa';
 import merge from 'lodash/merge';
 import fs from 'fs-extra';
 
-const bin = require.resolve('../lib/cli.js');
+const bin = require.resolve('../cli.js');
 
-const cli = (args, options) => {
+interface TestOptions {
+	cwd: string;
+	env?: Record<string, string>;
+}
+
+const cli = (args: string[], options: TestOptions) => {
 	return (input = '') => {
 		return execa(bin, args, {
 			cwd: options.cwd,
@@ -17,8 +22,8 @@ const cli = (args, options) => {
 	};
 };
 
-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 +428,48 @@ test('should work with relative formatter path', async () => {
 	expect(actual.exitCode).toBe(0);
 });
 
-async function writePkg(payload, options) {
+test('should print help', async () => {
+	const cwd = await gitBootstrap('fixtures/default');
+	const actual = await cli(['--help'], {cwd})();
+	expect(actual.stdout).toMatchInlineSnapshot(`
+		"@commitlint/cli@8.3.5 - Lint your commit messages
+
+		[input] reads from stdin if --edit, --env, --from and --to are omitted
+
+		Options:
+		  --color, -c          toggle colored output           [boolean] [default: true]
+		  --config, -g         path to the config file                          [string]
+		  --cwd, -d            directory to execute in
+		                                         [string] [default: (Working Directory)]
+		  --edit, -e           read last commit message from the specified file or
+		                       fallbacks to ./.git/COMMIT_EDITMSG
+		                                                       [string] [default: false]
+		  --env, -E            check message in the file at path given by environment
+		                       variable value                                   [string]
+		  --extends, -x        array of shareable configurations to extend       [array]
+		  --help-url, -H       help url in error message                        [string]
+		  --from, -f           lower end of the commit range to lint; applies if
+		                       edit=false                                       [string]
+		  --format, -o         output format of the results                     [string]
+		  --parser-preset, -p  configuration preset to use for
+		                       conventional-commits-parser                      [string]
+		  --quiet, -q          toggle console output          [boolean] [default: false]
+		  --to, -t             upper end of the commit range to lint; applies if
+		                       edit=false                                       [string]
+		  --verbose, -V        enable verbose output for reports without problems
+		                                                                       [boolean]
+		  -v, --version        display version information                     [boolean]
+		  -h, --help           Show help                                       [boolean]"
+	`);
+});
+
+test('should print version', async () => {
+	const cwd = await gitBootstrap('fixtures/default');
+	const actual = await cli(['--version'], {cwd})();
+	expect(actual.stdout).toMatch('@commitlint/cli@');
+});
+
+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);