Initial commit

node_modules/execa/lib/convert/concurrent.js

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+import {createDeferred} from '../utils/deferred.js';
+
+// When using multiple `.readable()`/`.writable()`/`.duplex()`, `final` and `destroy` should wait for other streams
+export const initializeConcurrentStreams = () => ({
+	readableDestroy: new WeakMap(),
+	writableFinal: new WeakMap(),
+	writableDestroy: new WeakMap(),
+});
+
+// Each file descriptor + `waitName` has its own array of promises.
+// Each promise is a single `.readable()`/`.writable()`/`.duplex()` call.
+export const addConcurrentStream = (concurrentStreams, stream, waitName) => {
+	const weakMap = concurrentStreams[waitName];
+	if (!weakMap.has(stream)) {
+		weakMap.set(stream, []);
+	}
+
+	const promises = weakMap.get(stream);
+	const promise = createDeferred();
+	promises.push(promise);
+	const resolve = promise.resolve.bind(promise);
+	return {resolve, promises};
+};
+
+// Wait for other streams, but stop waiting when subprocess ends
+export const waitForConcurrentStreams = async ({resolve, promises}, subprocess) => {
+	resolve();
+	const [isSubprocessExit] = await Promise.race([
+		Promise.allSettled([true, subprocess]),
+		Promise.all([false, ...promises]),
+	]);
+	return !isSubprocessExit;
+};