1 files changed, 46 insertions, 0 deletions
diff --git a/node_modules/execa/lib/promise.js b/node_modules/execa/lib/promise.js
new file mode 100644
index 0000000..bd9d523
--- /dev/null
+++ b/node_modules/execa/lib/promise.js
@@ -0,0 +1,46 @@
+'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
+};
+