forked from M3-Academy/challenge-algorithms-v2.0
47 lines
1.1 KiB
JavaScript
47 lines
1.1 KiB
JavaScript
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'use strict';
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const nativePromisePrototype = (async () => {})().constructor.prototype;
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const descriptors = ['then', 'catch', 'finally'].map(property => [
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property,
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Reflect.getOwnPropertyDescriptor(nativePromisePrototype, property)
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]);
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// The return value is a mixin of `childProcess` and `Promise`
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const mergePromise = (spawned, promise) => {
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for (const [property, descriptor] of descriptors) {
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// Starting the main `promise` is deferred to avoid consuming streams
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const value = typeof promise === 'function' ?
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(...args) => Reflect.apply(descriptor.value, promise(), args) :
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descriptor.value.bind(promise);
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Reflect.defineProperty(spawned, property, {...descriptor, value});
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}
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return spawned;
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};
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// Use promises instead of `child_process` events
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const getSpawnedPromise = spawned => {
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return new Promise((resolve, reject) => {
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spawned.on('exit', (exitCode, signal) => {
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resolve({exitCode, signal});
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});
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spawned.on('error', error => {
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reject(error);
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});
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if (spawned.stdin) {
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spawned.stdin.on('error', error => {
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reject(error);
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});
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}
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});
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};
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module.exports = {
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mergePromise,
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getSpawnedPromise
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};
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