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{"version":3,"sources":["../../src/lib/worker.ts"],"sourcesContent":["import type { ChildProcess } from 'child_process'\nimport { Worker as JestWorker } from 'next/dist/compiled/jest-worker'\nimport { Transform } from 'stream'\n\ntype FarmOptions = ConstructorParameters<typeof JestWorker>[1]\n\nconst RESTARTED = Symbol('restarted')\n\nconst cleanupWorkers = (worker: JestWorker) => {\n for (const curWorker of ((worker as any)._workerPool?._workers || []) as {\n _child?: ChildProcess\n }[]) {\n curWorker._child?.kill('SIGINT')\n }\n}\n\nexport class Worker {\n private _worker: JestWorker | undefined\n\n constructor(\n workerPath: string,\n options: FarmOptions & {\n timeout?: number\n onActivity?: () => void\n onActivityAbort?: () => void\n onRestart?: (method: string, args: any[], attempts: number) => void\n logger?: Pick<typeof console, 'error' | 'info' | 'warn'>\n exposedMethods: ReadonlyArray<string>\n enableWorkerThreads?: boolean\n }\n ) {\n let { timeout, onRestart, logger = console, ...farmOptions } = options\n\n let restartPromise: Promise<typeof RESTARTED>\n let resolveRestartPromise: (arg: typeof RESTARTED) => void\n let activeTasks = 0\n\n this._worker = undefined\n\n // ensure we end workers if they weren't before exit\n process.on('exit', () => {\n this.close()\n })\n\n const createWorker = () => {\n this._worker = new JestWorker(workerPath, {\n ...farmOptions,\n forkOptions: {\n ...farmOptions.forkOptions,\n env: {\n ...((farmOptions.forkOptions?.env || {}) as any),\n ...process.env,\n IS_NEXT_WORKER: 'true',\n } as any,\n },\n maxRetries: 0,\n }) as JestWorker\n restartPromise = new Promise(\n (resolve) => (resolveRestartPromise = resolve)\n )\n\n /**\n * Jest Worker has two worker types, ChildProcessWorker (uses child_process) and NodeThreadWorker (uses worker_threads)\n * Next.js uses ChildProcessWorker by default, but it can be switched to NodeThreadWorker with an experimental flag\n *\n * We only want to handle ChildProcessWorker's orphan process issue, so we access the private property \"_child\":\n * https://github.com/facebook/jest/blob/b38d7d345a81d97d1dc3b68b8458b1837fbf19be/packages/jest-worker/src/workers/ChildProcessWorker.ts\n *\n * But this property is not available in NodeThreadWorker, so we need to check if we are using ChildProcessWorker\n */\n if (!farmOptions.enableWorkerThreads) {\n for (const worker of ((this._worker as any)._workerPool?._workers ||\n []) as {\n _child?: ChildProcess\n }[]) {\n worker._child?.on('exit', (code, signal) => {\n if ((code || (signal && signal !== 'SIGINT')) && this._worker) {\n logger.error(\n `Next.js build worker exited with code: ${code} and signal: ${signal}`\n )\n\n // if a child process doesn't exit gracefully, we want to bubble up the exit code to the parent process\n process.exit(code ?? 1)\n }\n })\n\n // if a child process emits a particular message, we track that as activity\n // so the parent process can keep track of progress\n worker._child?.on('message', ([, data]: [number, unknown]) => {\n if (\n data &&\n typeof data === 'object' &&\n 'type' in data &&\n data.type === 'activity'\n ) {\n onActivity()\n }\n })\n }\n }\n\n let aborted = false\n const onActivityAbort = () => {\n if (!aborted) {\n options.onActivityAbort?.()\n aborted = true\n }\n }\n\n // Listen to the worker's stdout and stderr, if there's any thing logged, abort the activity first\n const abortActivityStreamOnLog = new Transform({\n transform(_chunk, _encoding, callback) {\n onActivityAbort()\n callback()\n },\n })\n // Stop the activity if there's any output from the worker\n this._worker.getStdout().pipe(abortActivityStreamOnLog)\n this._worker.getStderr().pipe(abortActivityStreamOnLog)\n\n // Pipe the worker's stdout and stderr to the parent process\n this._worker.getStdout().pipe(process.stdout)\n this._worker.getStderr().pipe(process.stderr)\n }\n createWorker()\n\n const onHanging = () => {\n const worker = this._worker\n if (!worker) return\n const resolve = resolveRestartPromise\n createWorker()\n logger.warn(\n `Sending SIGTERM signal to static worker due to timeout${\n timeout ? ` of ${timeout / 1000} seconds` : ''\n }. Subsequent errors may be a result of the worker exiting.`\n )\n worker.end().then(() => {\n resolve(RESTARTED)\n })\n }\n\n let hangingTimer: NodeJS.Timeout | false = false\n\n const onActivity = () => {\n if (hangingTimer) clearTimeout(hangingTimer)\n if (options.onActivity) options.onActivity()\n\n hangingTimer = activeTasks > 0 && setTimeout(onHanging, timeout)\n }\n\n for (const method of farmOptions.exposedMethods) {\n if (method.startsWith('_')) continue\n ;(this as any)[method] = timeout\n ? // eslint-disable-next-line no-loop-func\n async (...args: any[]) => {\n activeTasks++\n try {\n let attempts = 0\n for (;;) {\n onActivity()\n const result = await Promise.race([\n (this._worker as any)[method](...args),\n restartPromise,\n ])\n if (result !== RESTARTED) return result\n if (onRestart) onRestart(method, args, ++attempts)\n }\n } finally {\n activeTasks--\n onActivity()\n }\n }\n : (this._worker as any)[method].bind(this._worker)\n }\n }\n\n end(): 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