/
promise.js
47 lines (40 loc) · 1.09 KB
/
promise.js
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'use strict';
const mergePromiseProperty = (spawned, promise, property) => {
// Starting the main `promise` is deferred to avoid consuming streams
const value = typeof promise === 'function' ?
(...args) => promise()[property](...args) :
promise[property].bind(promise);
Object.defineProperty(spawned, property, {
value,
writable: true,
enumerable: false,
configurable: true
});
};
// The return value is a mixin of `childProcess` and `Promise`
const mergePromise = (spawned, promise) => {
mergePromiseProperty(spawned, promise, 'then');
mergePromiseProperty(spawned, promise, 'catch');
mergePromiseProperty(spawned, promise, 'finally');
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
};