child_process.spawn.js

const { spawn } = require("child_process");

function stream_cmd(cmd, args, { stdout, stderr, close, error }, options = {}) {
	const proc = spawn(cmd, args, options);

	if (stdout) {
		proc.stdout.on("data", stdout);
	}
	if (stderr) {
		proc.stderr.on("data", stderr);
	}
	if (close) {
		proc.on("close", close);
	}
	if (error) {
		proc.on("error", error);
	}

	return proc;
}

stream_cmd("git", ["status"], {
	close: code => console.log(`Exited with code:`, code),
	error: err => console.error(`command failed:`, err),
	stderr: buf => console.error(`stderr:`, String(buf)),
	stdout: buf => console.log(`stdout:`, String(buf)),
});