A practical end-to-end guide for migrating an existing .eslintrc.json config (ESLint v8 and before) to the new flat file config eslint.config.js (ESLint v9 and above) in a CommonJS Node.js project including linting of unit-tests with Jest.
CommonJS
CommonJS vs. ESM/ECMAScript cheat-sheet
Short comparison of the most common statements in CommonJS vs. ESM/ECMAScript for importing, exporting and in your package.json.
Convert an existing NodeJS project from CommonJS to ESM / ECMAScript
A quick guide for converting your existing NodeJS projects from CommonJS to ESM/ECMAScript. Including Express, Jest, Supertest and ESLint.
Use CommonJS npm packages in the browser with Browserify
A convenient way to use CommonJS npm packages in client-side JavaScript using Browserify.