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ESLint parsers must run synchronously, but many steps\n// of Babel's config loading (which is done for each file)\n// can be asynchronous\n// If ESLint starts supporting async parsers, we can move\n// everything back to the main thread.\nexport class WorkerClient extends Client {\n static #worker_threads_cache: typeof import(\"worker_threads\");\n static get #worker_threads() {\n return (WorkerClient.#worker_threads_cache ??= require(\"worker_threads\"));\n }\n\n #worker = new WorkerClient.#worker_threads.Worker(\n path.resolve(__dirname, \"../lib/worker/index.cjs\"),\n { env: WorkerClient.#worker_threads.SHARE_ENV },\n );\n\n constructor() {\n super((action: ACTIONS, payload: any) => {\n // We create a new SharedArrayBuffer every time rather than reusing\n // the same one, otherwise sometimes its contents get corrupted and\n // Atomics.wait wakes up too early.\n // https://github.com/babel/babel/pull/14541\n const signal = new Int32Array(new SharedArrayBuffer(8));\n\n const subChannel = new WorkerClient.#worker_threads.MessageChannel();\n\n this.#worker.postMessage(\n { signal, port: subChannel.port1, action, payload },\n [subChannel.port1],\n );\n\n Atomics.wait(signal, 0, 0);\n const { message } = WorkerClient.#worker_threads.receiveMessageOnPort(\n subChannel.port2,\n );\n\n if (message.error) throw Object.assign(message.error, message.errorData);\n else return message.result;\n });\n\n // The worker will never exit by itself. 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