Fix dependabot issues

node_modules/ava/lib/plugin-support/shared-workers.js

@@ -0,0 +1,140 @@
+const events = require('events');
+const serializeError = require('../serialize-error');
+
+let Worker;
+try {
+	({Worker} = require('worker_threads'));
+} catch {}
+
+const LOADER = require.resolve('./shared-worker-loader');
+
+let sharedWorkerCounter = 0;
+const launchedWorkers = new Map();
+
+const waitForAvailable = async worker => {
+	for await (const [message] of events.on(worker, 'message')) {
+		if (message.type === 'available') {
+			return;
+		}
+	}
+};
+
+function launchWorker({filename, initialData}) {
+	if (launchedWorkers.has(filename)) {
+		return launchedWorkers.get(filename);
+	}
+
+	const id = `shared-worker/${++sharedWorkerCounter}`;
+	const worker = new Worker(LOADER, {
+		// Ensure the worker crashes for unhandled rejections, rather than allowing undefined behavior.
+		execArgv: ['--unhandled-rejections=strict'],
+		workerData: {
+			filename,
+			id,
+			initialData
+		}
+	});
+	worker.setMaxListeners(0);
+
+	const launched = {
+		statePromises: {
+			available: waitForAvailable(worker),
+			error: events.once(worker, 'error').then(([error]) => error) // eslint-disable-line promise/prefer-await-to-then
+		},
+		exited: false,
+		worker
+	};
+
+	launchedWorkers.set(filename, launched);
+	worker.once('exit', () => {
+		launched.exited = true;
+	});
+
+	return launched;
+}
+
+async function observeWorkerProcess(fork, runStatus) {
+	let registrationCount = 0;
+	let signalDeregistered;
+	const deregistered = new Promise(resolve => {
+		signalDeregistered = resolve;
+	});
+
+	fork.promise.finally(() => {
+		if (registrationCount === 0) {
+			signalDeregistered();
+		}
+	});
+
+	fork.onConnectSharedWorker(async channel => {
+		const launched = launchWorker(channel);
+
+		const handleChannelMessage = ({messageId, replyTo, serializedData}) => {
+			launched.worker.postMessage({
+				type: 'message',
+				testWorkerId: fork.forkId,
+				messageId,
+				replyTo,
+				serializedData
+			});
+		};
+
+		const handleWorkerMessage = async message => {
+			if (message.type === 'broadcast' || (message.type === 'message' && message.testWorkerId === fork.forkId)) {
+				const {messageId, replyTo, serializedData} = message;
+				channel.forwardMessageToFork({messageId, replyTo, serializedData});
+			}
+
+			if (message.type === 'deregistered-test-worker' && message.id === fork.forkId) {
+				launched.worker.off('message', handleWorkerMessage);
+
+				registrationCount--;
+				if (registrationCount === 0) {
+					signalDeregistered();
+				}
+			}
+		};
+
+		launched.statePromises.error.then(error => { // eslint-disable-line promise/prefer-await-to-then
+			signalDeregistered();
+			launched.worker.off('message', handleWorkerMessage);
+			runStatus.emitStateChange({type: 'shared-worker-error', err: serializeError('Shared worker error', true, error)});
+			channel.signalError();
+		});
+
+		try {
+			await launched.statePromises.available;
+
+			registrationCount++;
+			launched.worker.postMessage({
+				type: 'register-test-worker',
+				id: fork.forkId,
+				file: fork.file
+			});
+
+			fork.promise.finally(() => {
+				launched.worker.postMessage({
+					type: 'deregister-test-worker',
+					id: fork.forkId
+				});
+
+				channel.off('message', handleChannelMessage);
+			});
+
+			launched.worker.on('message', handleWorkerMessage);
+			channel.on('message', handleChannelMessage);
+			channel.signalReady();
+		} catch {
+			return;
+		} finally {
+			// Attaching listeners has the side-effect of referencing the worker.
+			// Explicitly unreference it now so it does not prevent the main process
+			// from exiting.
+			launched.worker.unref();
+		}
+	});
+
+	return deregistered;
+}
+
+exports.observeWorkerProcess = observeWorkerProcess;