Some ideas:

• Improved errors
  • Include command
• Buffer a Node.js stream to a string:

  nano-spawn/index.js

  Lines 86 to 97 in 8bdc484

  	const bufferOutput = async (stream, result, streamName) => {
  	if (!stream) {
  	return;
  	}
  	stream.setEncoding('utf8');
  	result[streamName] = '';
  	stream.on('data', chunk => {
  	result[streamName] += chunk;
  	});
  	await finished(stream, {cleanup: true});
  	};

• inheritEnv option
• Duration on the ChildProcess and errors
• Windows stuff: #12
• child_process/promises.execFile with:
  • Does not throw on non-0 exit code or signal termination
  • Does not handle subprocess.std* stream errors, which leads to unhandled promise rejections
  • Opportunity to also add .output (interleaved).
• The stdout/stderr output is only buffered on success, not failure
• promise.child is a ChildProcess that might not have been spawned (e.g. if the command was misspelled). With nano-spawn/pico-spawn, it is a promise that is rejected in such cases.

Thoughts? Anything missing?