support cjs config file extension for eslint (#19)

* support cjs config file extension for eslint

* Update src/parsers/DocumentParser.js

Co-authored-by: Gabriel McAdams <ghmcadams@users.noreply.github.com>

README.md

@@ -20,7 +20,7 @@ Adds details and a documentation link beside each [ESLint rule](https://eslint.o
 
 Supports all configuration file formats currently [supported by ESLint](https://eslint.org/docs/user-guide/configuring#configuration-file-formats)
 
-- JavaScript - use `.eslintrc.js` and export an object containing your configuration.
+- JavaScript - use `.eslintrc.js` or `.eslintrc.cjs` and export an object containing your configuration.
 - YAML - use `.eslintrc.yaml` or `.eslintrc.yml` to define the configuration structure.
 - JSON - use `.eslintrc.json` to define the configuration structure. ESLint’s JSON files also allow JavaScript-style comments.
 - **Deprecated** - use `.eslintrc`, which can be either JSON or YAML.

src/parsers/DocumentParser.js

@@ -23,7 +23,7 @@ export default class DocumentParser extends Parser {
 
         if (new.target === DocumentParser) {
             // Choose parser based on filename and language
-            if (isMatch('javascript', '**/.eslintrc.js') || isMatch('javascriptreact', '**/.eslintrc.js')) {
+            if (isMatch('javascript', '**/.eslintrc.js', '**/.eslintrc.cjs') || isMatch('javascriptreact', '**/.eslintrc.js', '**/.eslintrc.cjs')) {
                 return new JSParser(document);
             } else if (isMatch('json', '**/.eslintrc', '**/.eslintrc.json') || isMatch('jsonc', '**/.eslintrc', '**/.eslintrc.json')) {
                 return new JSONParser(document);