feat: add support for .mts config file (#4581)

* feat: add support for .mts config file

* fix: add support for .mts/.cts configs in tests

Author: amir-rahmanii

@commitlint/load/fixtures/basic-config/.commitlintrc.cts

@@ -0,0 +1,10 @@
+'use strict';
+
+module.exports = {
+	formatter: '@commitlint/format',
+	rules: {
+		zero: [0, 'never'],
+		one: [1, 'always'],
+		two: [2, 'never'],
+	},
+};

@commitlint/load/fixtures/basic-config/commitlint.config.cts

@@ -0,0 +1,10 @@
+'use strict';
+
+module.exports = {
+	formatter: '@commitlint/format',
+	rules: {
+		zero: [0, 'never'],
+		one: [1, 'always'],
+		two: [2, 'never'],
+	},
+};

@commitlint/load/fixtures/basic-config/esm/.commitlintrc.mts

@@ -0,0 +1,8 @@
+export default {
+	formatter: '@commitlint/format',
+	rules: {
+		zero: [0, 'never'],
+		one: [1, 'always'],
+		two: [2, 'never'],
+	},
+};

@commitlint/load/fixtures/basic-config/esm/commitlint.config.mts

@@ -0,0 +1,8 @@
+export default {
+	formatter: '@commitlint/format',
+	rules: {
+		zero: [0, 'never'],
+		one: [1, 'always'],
+		two: [2, 'never'],
+	},
+};

@commitlint/load/fixtures/extends-config/.commitlintrc.cts

@@ -0,0 +1,8 @@
+'use strict';
+
+module.exports = {
+	extends: ['./first-extended'],
+	rules: {
+		zero: [0, 'never'],
+	},
+};

@commitlint/load/fixtures/extends-config/commitlint.config.cts

@@ -0,0 +1,8 @@
+'use strict';
+
+module.exports = {
+	extends: ['./first-extended'],
+	rules: {
+		zero: [0, 'never'],
+	},
+};

@commitlint/load/fixtures/extends-config/esm/.commitlintrc.mts

@@ -0,0 +1,6 @@
+export default {
+	extends: ['./first-extended'],
+	rules: {
+		zero: [0, 'never'],
+	},
+};

@commitlint/load/fixtures/extends-config/esm/commitlint.config.mts

@@ -0,0 +1,6 @@
+export default {
+	extends: ['./first-extended'],
+	rules: {
+		zero: [0, 'never'],
+	},
+};

@commitlint/load/src/load.test.ts

@@ -240,24 +240,30 @@ describe.each([["basic"], ["extends"]])("%s config", (template) => {
 		"commitlint.config.cjs",
 		"commitlint.config.js",
 		"commitlint.config.mjs",
+		"commitlint.config.mts",
+		"commitlint.config.cts",
 		"package.json",
 		"package.yaml",
 		".commitlintrc",
 		".commitlintrc.cjs",
 		".commitlintrc.js",
 		".commitlintrc.json",
 		".commitlintrc.mjs",
+		".commitlintrc.mts",
+		".commitlintrc.cts",
 		".commitlintrc.yml",
 		".commitlintrc.yaml",
 	];
 
 	const configTestCases = [
 		...configFiles
-			.filter((filename) => !filename.endsWith(".mjs"))
+			.filter(
+				(filename) => !filename.endsWith(".mjs") && !filename.endsWith(".mts"),
+			)
 			.map((filename) => ({ filename, isEsm: false })),
 		...configFiles
 			.filter((filename) =>
-				[".mjs", ".js"].some((ext) => filename.endsWith(ext)),
+				[".mjs", ".js", ".mts"].some((ext) => filename.endsWith(ext)),
 			)
 			.map((filename) => ({ filename, isEsm: true })),
 	];

@commitlint/load/src/utils/load-config.ts

@@ -58,12 +58,15 @@ export async function loadConfig(
 			// files supported by TypescriptLoader
 			`.${moduleName}rc.ts`,
 			`.${moduleName}rc.cts`,
+			`.${moduleName}rc.mts`,
 			`${moduleName}.config.ts`,
 			`${moduleName}.config.cts`,
+			`${moduleName}.config.mts`,
 		],
 		loaders: {
 			".ts": tsLoader,
 			".cts": tsLoader,
+			".mts": tsLoader,
 			".cjs": loaders[".cjs"],
 			".js": loaders[".js"],
 		},