build.ts

import fs from 'fs-extra';
import childProcess from 'child_process';

(async () => {
  try {
    // remove current build
    await remove('./dist/');
    // copy front-end files
    await copy('./src/public', './dist/public');
    await copy('./src/views', './dist/views');
    // copy back-end files
    await exec('tsc --build tsconfig.json', './');
  } catch (err) {
    console.error(err);
    process.exit(1);
  }
})();

function remove(loc: string): Promise<void> {
  return new Promise((res, rej) => {
    return fs.remove(loc, err => {
      return (err ? rej(err) : res());
    });
  });
}

function copy(src: string, dest: string): Promise<void> {
  return new Promise((res, rej) => {
    return fs.copy(src, dest, err => {
      return (err ? rej(err) : res());
    });
  });
}

function exec(cmd: string, loc: string): Promise<void> {
  return new Promise((res, rej) => {
    return childProcess.exec(cmd, { cwd: loc }, (err, stdout, stderr) => {
      if (stdout) {
        console.log(stdout);
      }
      if (stderr) {
        console.warn(stderr);
      }
      return (err ? rej(err) : res());
    });
  });
}