set ESBUILD_BINARY_PATH to empty path will cause ebuild hang

[hardfist]

when I debug local build esbuild , I often need to set ESBUILD_BINARY_PATH to local build esbuild path, but sometimes I may set it wrongly or accidently clean esbuild, then esbuild build or transform will hang.
I found the this may be related to the following code
main.js

 let child = child_process.spawn(command, args.concat(`--service=${"0.14.25"}`, "--ping"), {
    windowsHide: true,
    stdio: ["pipe", "pipe", "inherit"],
    cwd: defaultWD
  });
  let { readFromStdout, afterClose, service } = createChannel({
    writeToStdin(bytes) {
      child.stdin.write(bytes, (err) => {
        if (err)
          afterClose();
      });
    },
    readFileSync: fs2.readFileSync,
    isSync: false,
    isBrowser: false,
    esbuild: node_exports
  });
  child.on('error', (err) => {
    console.log('err:',err) // triggered when child_process failed
  })
  child.stdin.on("error", afterClose); // not triggered when child_process failed
  const stdin = child.stdin;
  const stdout = child.stdout;

It seems that esbuild doesn't handle child_process exception properly.

[evanw]

If you're using esbuild's synchronous API calls, you may be able to work around this with ESBUILD_WORKER_THREADS=0 in the meantime.