Fix dependabot issues

node_modules/ava/lib/worker/plugin.js

@@ -0,0 +1,121 @@
+const v8 = require('v8');
+const pkg = require('../../package.json');
+const subprocess = require('./subprocess');
+const options = require('./options');
+
+const workers = new Map();
+const workerTeardownFns = new WeakMap();
+
+function createSharedWorker(filename, initialData, teardown) {
+	const channel = subprocess.registerSharedWorker(filename, initialData, teardown);
+
+	class ReceivedMessage {
+		constructor(id, serializedData) {
+			this.id = id;
+			this.data = v8.deserialize(new Uint8Array(serializedData));
+		}
+
+		reply(data) {
+			return publishMessage(data, this.id);
+		}
+	}
+
+	// Ensure that, no matter how often it's received, we have a stable message
+	// object.
+	const messageCache = new WeakMap();
+	async function * receiveMessages(replyTo) {
+		for await (const evt of channel.receive()) {
+			if (replyTo === undefined && evt.replyTo !== undefined) {
+				continue;
+			}
+
+			if (replyTo !== undefined && evt.replyTo !== replyTo) {
+				continue;
+			}
+
+			let message = messageCache.get(evt);
+			if (message === undefined) {
+				message = new ReceivedMessage(evt.messageId, evt.serializedData);
+				messageCache.set(evt, message);
+			}
+
+			yield message;
+		}
+	}
+
+	function publishMessage(data, replyTo) {
+		const id = channel.post([...v8.serialize(data)], replyTo);
+
+		return {
+			id,
+			async * replies() {
+				yield * receiveMessages(id);
+			}
+		};
+	}
+
+	return {
+		available: channel.available,
+		protocol: 'experimental',
+
+		get currentlyAvailable() {
+			return channel.currentlyAvailable;
+		},
+
+		publish(data) {
+			return publishMessage(data);
+		},
+
+		async * subscribe() {
+			yield * receiveMessages();
+		}
+	};
+}
+
+const supportsSharedWorkers = process.versions.node >= '12.17.0';
+
+function registerSharedWorker({
+	filename,
+	initialData,
+	supportedProtocols,
+	teardown
+}) {
+	if (!options.get().experiments.sharedWorkers) {
+		throw new Error('Shared workers are experimental. Opt in to them in your AVA configuration');
+	}
+
+	if (!supportsSharedWorkers) {
+		throw new Error('Shared workers require Node.js 12.17 or newer');
+	}
+
+	if (!supportedProtocols.includes('experimental')) {
+		throw new Error(`This version of AVA (${pkg.version}) does not support any of the desired shared worker protocols: ${supportedProtocols.join()}`);
+	}
+
+	let worker = workers.get(filename);
+	if (worker === undefined) {
+		worker = createSharedWorker(filename, initialData, async () => {
+			// Run possibly asynchronous teardown functions serially, in reverse
+			// order. Any error will crash the worker.
+			const teardownFns = workerTeardownFns.get(worker);
+			if (teardownFns !== undefined) {
+				for await (const fn of [...teardownFns].reverse()) {
+					await fn();
+				}
+			}
+		});
+		workers.set(filename, worker);
+	}
+
+	if (teardown !== undefined) {
+		if (workerTeardownFns.has(worker)) {
+			workerTeardownFns.get(worker).push(teardown);
+		} else {
+			workerTeardownFns.set(worker, [teardown]);
+		}
+	}
+
+	return worker;
+}
+
+exports.registerSharedWorker = registerSharedWorker;