feat(load): add support for .commitlintrc.cjs and commitlint.config.cjs files (#2797)

* feat(load): add support for `*.cjs` files

* chore(load): improve comment in searchPlaces

* docs: update supported configs list in README.md

Co-authored-by: Himanshu Mehta <[email protected]>

Author: himanshumehta1114

Diff for: @commitlint/load/src/utils/load-config.ts

@@ -15,15 +15,21 @@ export async function loadConfig(
 	const moduleName = 'commitlint';
 	const explorer = cosmiconfig(moduleName, {
 		searchPlaces: [
+			// cosmiconfig overrides default searchPlaces if any new search place is added (For e.g. `*.ts` files),
+			// we need to manually merge default searchPlaces from https://github.com/davidtheclark/cosmiconfig#searchplaces
 			'package.json',
 			`.${moduleName}rc`,
 			`.${moduleName}rc.json`,
 			`.${moduleName}rc.yaml`,
 			`.${moduleName}rc.yml`,
-			`.${moduleName}rc.ts`,
 			`.${moduleName}rc.js`,
-			`${moduleName}.config.ts`,
+			`.${moduleName}rc.cjs`,
 			`${moduleName}.config.js`,
+			`${moduleName}.config.cjs`,
+
+			// files supported by TypescriptLoader
+			`.${moduleName}rc.ts`,
+			`${moduleName}.config.ts`,
 		],
 		loaders: {
 			'.ts': TypeScriptLoader,

Diff for: README.md

@@ -124,7 +124,18 @@ Check the [husky documentation](https://typicode.github.io/husky/#/?id=manual) o
 
 ## Config
 
-- Configuration is picked up from `commitlint.config.js`, `.commitlintrc.js`, `.commitlintrc`, `.commitlintrc.json`, `.commitlintrc.yml` file or a `commitlint` field in `package.json`
+- Configuration is picked up from:
+  - `.commitlintrc`
+  - `.commitlintrc.json`
+  - `.commitlintrc.yaml`
+  - `.commitlintrc.yml`
+  - `.commitlintrc.js`
+  - `.commitlintrc.cjs`
+  - `.commitlintrc.ts`
+  - `commitlint.config.js`
+  - `commitlint.config.cjs`
+  - `commitlint.config.ts`
+  - `commitlint` field in `package.json`
 - Packages: [cli](./@commitlint/cli), [core](./@commitlint/core)
 - See [Rules](./docs/reference-rules.md) for a complete list of possible rules
 - An example configuration can be found at [@commitlint/config-conventional](./@commitlint/config-conventional/index.js)