refactor(prompt): migrate prompt to typescript

@commitlint/prompt/package.json

@@ -7,20 +7,8 @@
     "lib/"
   ],
   "scripts": {
-    "build": "cross-env NODE_ENV=production babel src --out-dir lib --source-maps",
-    "commit": "git-cz",
     "deps": "dep-check",
-    "pkg": "pkg-check --skip-import",
-    "start": "yarn run watch",
-    "watch": "babel src --out-dir lib --watch  --source-maps"
-  },
-  "babel": {
-    "presets": [
-      "commitlint"
-    ],
-    "ignore": [
-      "**/*.test.js"
-    ]
+    "pkg": "pkg-check --skip-import"
   },
   "config": {
     "commitizen": {
@@ -48,15 +36,10 @@
     "node": ">=v10.22.1"
   },
   "devDependencies": {
-    "@babel/cli": "^7.11.6",
-    "@babel/core": "^7.11.6",
     "@commitlint/utils": "^11.0.0",
-    "babel-preset-commitlint": "^11.0.0",
-    "commitizen": "4.2.2",
-    "cross-env": "7.0.3"
+    "commitizen": "4.2.2"
   },
   "dependencies": {
-    "@babel/runtime": "^7.11.2",
     "@commitlint/load": "^11.0.0",
     "chalk": "^4.0.0",
     "lodash": "^4.17.19",

@commitlint/prompt/src/index.ts

@@ -0,0 +1,17 @@
+// eslint-disable-next-line @typescript-eslint/ban-ts-comment
+// @ts-ignore
+import vorpal from 'vorpal';
+import input from './input';
+
+type Commit = (input: string) => void;
+
+/**
+ * Entry point for commitizen
+ * @param _ inquirer instance passed by commitizen, unused
+ * @param commit callback to execute with complete commit message
+ * @return generated commit message
+ */
+export async function prompter(_: unknown, commit: Commit): Promise<void> {
+	const message = await input(vorpal);
+	commit(message);
+}

@commitlint/prompt/src/input.ts

@@ -0,0 +1,63 @@
+import load from '@commitlint/load';
+import throat from 'throat';
+
+import format from './library/format';
+import getPrompt from './library/get-prompt';
+import settings from './settings';
+import {InputSetting, Prompter, Result} from './library/types';
+import {getHasName, getMaxLength, getRules} from './library/utils';
+
+export default input;
+
+/**
+ * Get user input by interactive prompt based on
+ * conventional-changelog-lint rules.
+ * @param prompter
+ * @return commit message
+ */
+async function input(prompter: () => Prompter): Promise<string> {
+	const results: Result = {
+		type: null,
+		scope: null,
+		subject: null,
+		body: null,
+		footer: null,
+	};
+
+	const {rules} = await load();
+	const parts = ['type', 'scope', 'subject', 'body', 'footer'] as const;
+	const headerParts = ['type', 'scope', 'subject'];
+
+	const headerLengthRule = getRules('header', rules).find(
+		getHasName('max-length')
+	);
+	const maxLength = getMaxLength(headerLengthRule);
+
+	await Promise.all(
+		parts.map(
+			throat(1, async (input) => {
+				const inputRules = getRules(input, rules);
+				const inputSettings: InputSetting = settings[input];
+
+				if (headerParts.includes(input) && maxLength < Infinity) {
+					inputSettings.header = {
+						length: maxLength,
+					};
+				}
+
+				results[input] = await getPrompt(input, {
+					rules: inputRules,
+					settings: inputSettings,
+					results,
+					prompter,
+				});
+			})
+		)
+	).catch((err) => {
+		console.error(err);
+		return '';
+	});
+
+	// Return the results
+	return format(results);
+}

@commitlint/prompt/src/library/format.js → @commitlint/prompt/src/library/format.ts

@@ -1,18 +1,18 @@
 import chalk from 'chalk';
+import {Result} from './types';
 
 export default format;
 
 /**
  * Get formatted commit message
- * @param  {object}  input object containing structured results
- * @param  {boolean} debug show debug information in commit message
- * @return {string}        formatted debug message
+ * @param input object containing structured results
+ * @param debug show debug information in commit message
+ * @return formatted debug message
  */
-function format(input, debug = false) {
+function format(input: Result, debug = false): string {
 	const results = debug
-		? Object.entries(input || {}).reduce((registry, item) => {
-				const [name, value] = item;
-				registry[name] =
+		? Object.entries(input).reduce<Result>((registry, [name, value]) => {
+				registry[name as 'type' | 'scope' | 'subject' | 'body' | 'footer'] =
 					value === null ? chalk.grey(`<${name}>`) : chalk.bold(value);
 				return registry;
 		  }, {})