Promisefy child_process spawn in typescript

promisefied-spawn.ts

import { spawn } from "child_process";
import { SpawnOptionsWithoutStdio } from "node:child_process";

export default function spawnAsync(
  cmd: string,
  args: string[] = [],
  options: SpawnOptionsWithoutStdio = {}
) {
  return new Promise<number>((resolve, reject) => {
    const result = spawn(cmd, args, options);

    if (result.stdout) {
      result.stdout.on("data", (data) => {
        process.stdout.write(data);
      });
    }

    if (result.stderr) {
      result.stderr.on("data", (data) => {
        process.stderr.write(data);
      });
    }

    result.on("close", (code) => {
      console.log(`child process exited with code ${code}`);

      if (code !== 0) {
        reject(code);
      }

      resolve(code);
    });
  });
}