build.mjs

import { spawn } from "cross-spawn";

const args = process.argv.slice(2);
const tsc = process.env.CI || args.includes("--tsc");

exec("pnpm", ["rollup", "-c"])
  .then(() => tsc && exec("pnpm", ["--recursive", "tsc", "-b"]))
  .then(() =>
    exec("node", ["scripts/copy-build-to-dist.mjs", ...(tsc ? ["--tsc"] : [])])
  )
  .then(() => process.exit(0))
  .catch((err) => {
    console.error(err);
    process.exit(1);
  });

/**
 * @param {string} command
 * @param {string[]} [args]
 */
function exec(command, args) {
  /** @type {(data: any) => any} */
  let handleData = (data) => console.log(data.toString().trim());

  /** @type {(data: Error) => any} */
  let handleError = (data) => console.error(data.toString().trim());

  return new Promise((resolve, reject) => {
    let ls = spawn(command, args, { cwd: process.cwd() });
    ls.stdout.on("data", handleData);
    ls.stderr.on("data", handleData);
    ls.on("error", handleError);
    ls.on("close", (code) => {
      if (code === 0) {
        resolve(void 0);
      } else {
        reject(new Error(`${command} exited with code ${code}`));
      }
    });
  });
}