esbuild로 CJS와 ESM 동시 지원

• CLI
  • https://dev.to/endel/nodejs-package-authors-please-support-both-cjs-and-esm-1oj3

npx esbuild --outdir=build --platform=node --format=cjs src/*.ts
npx esbuild --out-extension:.js=.mjs --outdir=build --platform=node --format=esm src/*.ts

• Scripts
  • https://github.com/youngkiu/schema-to-erd/blob/main/build.js

#!/usr/bin/env node
import esbuild from 'esbuild';

const commonOptions  = {
  // https://esbuild.github.io/api/
  entryPoints: ['src/main.js'],
  bundle: true,
  platform: 'node',
  minify: true,
  outdir: 'dist'
}

esbuild
  .build({
    ...commonOptions,
    format: 'esm',
    outExtension: { '.js': '.mjs' }
  })
  .catch(() => process.exit(1))

esbuild
  .build({
    ...commonOptions,
      format: 'cjs',
      outExtension: { '.js': '.cjs' }
  })
  .catch(() => process.exit(1))

package.json

  "main": "./build/index.js",
  "module": "./build/index.mjs",
  "typings": "./build/index.d.ts",

참고)

• https://antfu.me/posts/publish-esm-and-cjs
• https://redfin.engineering/node-modules-at-war-why-commonjs-and-es-modules-cant-get-along-9617135eeca1