build.js

const esbuild = require('esbuild');

const production = process.argv.findIndex(argItem => argItem === '--mode=production') >= 0;

const onRebuild = (context) => {
  return async (err, res) => {
    if (err) {
      return console.error(`[${context}]: Rebuild failed`, err);
    }

    console.log(`[${context}]: Rebuild succeeded, warnings:`, res.warnings);
  }
}

const server = {
  platform: 'node',
  target: ['node16'],
  format: 'cjs',
};

const client = {
  platform: 'browser',
  target: ['chrome93'],
  format: 'iife',
};

for (const context of [ 'client', 'server' ]) {
  esbuild.build({
    bundle: true,
    entryPoints: [`${context}/${context}.ts`],
    outfile: `dist/${context}.js`,
    watch: production ? false : {
      onRebuild: onRebuild(context),
    },
    ...(context === 'client' ? client : server),
  }).then(() => console.log(`[${context}]: Built successfully!`)).catch(() => process.exit(1));
}