esbuild node app setup for latest stable node > 14.16.0

esbuild.js

// same as `yarn esbuild index.ts src/**/*.ts --platform=node --format=esm --tsconfig=./tsconfig.json --outdir=dist --watch`
// but with respawn server on change

import esbuild from 'esbuild';
import fg from 'fast-glob';
import { spawn } from 'child_process';

const entryPoints = await fg(['index.ts', 'src/**/*.ts']);

const dev = process.env.NODE_ENV !== 'production';

let childProcess = null;

const startServer = () => {
  if (childProcess) {
    childProcess.kill();
  }

  console.info('Starting/Restarting dev server');

  childProcess = spawn(
    'node',
    ['--experimental-specifier-resolution=node', 'dist/index.js'],
    {
      stdio: 'inherit',
    },
  );
};

const buildRes = await esbuild.build({
  entryPoints,
  platform: 'node',
  format: 'esm',
  tsconfig: './tsconfig.json',
  outdir: 'dist',
  watch: dev
    ? {
        onRebuild: (error, result) => {
          if (error) {
            console.error(error);
            return;
          }
          result.warnings.forEach(warning => console.warn(warning));
          startServer();
        },
      }
    : false,
});

buildRes.warnings.forEach(warning => console.warn(warning));

if (dev) {
  startServer();
}

package.json

...
type="module"
...

tsconfig.json

{
  "compilerOptions": {
    "rootDir": ".",
    "strict": true,
    "module": "ESNext",
    "target": "ESNext",
    "esModuleInterop": true,
    "moduleResolution": "node",
    "outDir": "./dist",
    "sourceMap": true,
    "isolatedModules": true,
    /* Additional Checks */
    "noUnusedLocals": true /* Report errors on unused locals. */,
    "noUnusedParameters": true /* Report errors on unused parameters. */,
    "noImplicitReturns": true /* Report error when not all code paths in function return a value. */,
    "noFallthroughCasesInSwitch": true /* Report errors for fallthrough cases in switch statement. */,
    "noUncheckedIndexedAccess": true
  },
  "exclude": ["./dist", "./scripts"]
}