Configurations can be quite complex, and sometimes you may want to utilize the great type checking that TypeScript provided. Change your xxx.config.js to xxx.config.ts is not an ideal solutions as you will need to have a Node.js register involved to transpile it into JavaScript and some tools might not support doing that way. Fortunately, TypeScript also support type check in plain JavaScript file with JSDoc. Here is an example of Webpack config with type checks:
