import fs from 'fs';
import { build } from 'esbuild';
import extractUnusedFiles from 'esbuild-plugin-unused-modules';

build({
  ...options,
  plugins: [
    extractUnusedFiles('./src', (unusedFiles) => {
      // print unused file list in console
      console.log(unusedFiles);

      // write unused file list in any file
      fs.writeFileSync('unusedFiles.json', JSON.stringify(unusedFiles));

      /* ex) remove unused files, ...etc */
    })
  ],
});

const extractUnusedFiles: (rootPath: string, callback: (unusedFiles: string[]) => void, options?: {
    excludeExp?: RegExp;
    tsconfigFileName?: string;
}) => {
    name: string;
    setup(build: PluginBuild): void;
};