Gecko [ gandhischool.edu.np ]

Name	Size	Permission
command.js	1.16 KB	-rw-rw-rw-
error.js	2.12 KB	-rw-rw-rw-
kill.js	3.02 KB	-rw-rw-rw-
promise.js	1.12 KB	-rw-rw-rw-
stdio.js	1.16 KB	-rw-rw-rw-
stream.js	2.34 KB	-rw-rw-rw-

Code Editor : promise.js

'use strict';

const nativePromisePrototype = (async () => {})().constructor.prototype;
const descriptors = ['then', 'catch', 'finally'].map(property => [
	property,
	Reflect.getOwnPropertyDescriptor(nativePromisePrototype, property)
]);

// The return value is a mixin of `childProcess` and `Promise`
const mergePromise = (spawned, promise) => {
	for (const [property, descriptor] of descriptors) {
		// Starting the main `promise` is deferred to avoid consuming streams
		const value = typeof promise === 'function' ?
			(...args) => Reflect.apply(descriptor.value, promise(), args) :
			descriptor.value.bind(promise);

Reflect.defineProperty(spawned, property, {...descriptor, value});
	}

return spawned;
};

// Use promises instead of `child_process` events
const getSpawnedPromise = spawned => {
	return new Promise((resolve, reject) => {
		spawned.on('exit', (exitCode, signal) => {
			resolve({exitCode, signal});
		});

spawned.on('error', error => {
			reject(error);
		});

if (spawned.stdin) {
			spawned.stdin.on('error', error => {
				reject(error);
			});
		}
	});
};

module.exports = {
	mergePromise,
	getSpawnedPromise
};

${this.title}

Code Editor : promise.js