build.js

#!/usr/bin/env node
const esbuild = require('esbuild')

// https://esbuild.github.io/api/
esbuild.build({
  bundle: true,
  entryPoints: ['index.ts'],
  external: [
    '@babel/runtime',
    'isomorphic-fetch',
    'graphql-request'
  ],
  format: 'esm',
  logLevel: "info",
  metafile: true,
  minify: true,
  outfile: 'dist/index.js',
  platform: 'neutral',
  sourcemap: true,
  target: 'es2020',
})
.then((result) => {
  return esbuild.analyzeMetafile(result.metafile)
}).then(analyzeResult => {
  console.log('------------------------------')
  console.log('Build analysis')
  console.log('------------------------------')
  console.log(analyzeResult)
})
.catch((e) => {
  console.error("Build error!", e)
  process.exit(1)
});