esbuild.mjs

import esbuild from 'esbuild';
import {copyFileSync, existsSync, mkdirSync, readFileSync, readdirSync, statSync} from 'node:fs';
import {join} from 'node:path';

const PACKAGE_JSON = 'package.json';

const readPackageJson = () => {
  const packageJson = join(process.cwd(), PACKAGE_JSON);
  const json = readFileSync(packageJson, 'utf8');
  const {peerDependencies, files} = JSON.parse(json);
  return {
    workspacePeerDependencies: peerDependencies ?? {},
    packageJsonFiles: files ?? []
  };
};

const {workspacePeerDependencies, packageJsonFiles} = readPackageJson();

const dist = join(process.cwd(), 'dist');

const createDistFolder = () => {
  if (!existsSync(dist)) {
    mkdirSync(dist);
  }
};

const buildBrowser = (entryPoints) => {
  esbuild
    .build({
      entryPoints,
      outdir: 'dist',
      bundle: true,
      sourcemap: true,
      minify: true,
      splitting: false,
      format: 'esm',
      define: {global: 'window'},
      target: ['esnext'],
      platform: 'browser',
      conditions: ['browser'],
      external: [...Object.keys(workspacePeerDependencies)]
    })
    .catch(() => process.exit(1));
};

const bundleFiles = () => {
  const entryPoints = readdirSync(join(process.cwd(), 'src'))
    .filter(
      (file) =>
        !file.includes('test') &&
        !file.includes('spec') &&
        !file.includes('mock') &&
        statSync(join(process.cwd(), 'src', file)).isFile()
    )
    .map((file) => `src/${file}`);

  buildBrowser(entryPoints);
};

const copyFiles = () => {
  const copyFile = (filename) => copyFileSync(join(process.cwd(), filename), join(dist, filename));

  packageJsonFiles.filter((entry) => !entry.includes('*')).forEach(copyFile);

  copyFile(PACKAGE_JSON);
};

export const build = () => {
  createDistFolder();
  bundleFiles();
  copyFiles();
};

build();