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crossSpawn : nodeSpawn\n/* c8 ignore stop */\n\n/**\n * The signature for the cleanup method.\n *\n * Arguments indicate the exit status of the child process.\n *\n * If a Promise is returned, then the process is not terminated\n * until it resolves, and the resolution value is treated as the\n * exit status (if a number) or signal exit (if a signal string).\n *\n * If `undefined` is returned, then no change is made, and the parent\n * exits in the same way that the child exited.\n *\n * If boolean `false` is returned, then the parent's exit is canceled.\n *\n * If a number is returned, then the parent process exits with the number\n * as its exitCode.\n *\n * If a signal string is returned, then the parent process is killed with\n * the same signal that caused the child to exit.\n */\nexport type Cleanup = (\n code: number | null,\n signal: null | NodeJS.Signals\n) =>\n | void\n | undefined\n | number\n | NodeJS.Signals\n | false\n | Promise<void | undefined | number | NodeJS.Signals | false>\n\nexport type FgArgs =\n | [program: string | string[], cleanup?: Cleanup]\n | [program: string[], opts?: SpawnOptions, cleanup?: Cleanup]\n | [program: string, cleanup?: Cleanup]\n | [program: string, opts?: SpawnOptions, cleanup?: Cleanup]\n | [program: string, args?: string[], cleanup?: Cleanup]\n | [\n program: string,\n args?: string[],\n opts?: SpawnOptions,\n cleanup?: Cleanup\n ]\n\n/**\n * Normalizes the arguments passed to `foregroundChild`.\n *\n * Exposed for testing.\n *\n * @internal\n */\nexport const normalizeFgArgs = (\n fgArgs: FgArgs\n): [\n program: string,\n args: string[],\n spawnOpts: SpawnOptions,\n cleanup: Cleanup\n] => {\n let [program, args = [], spawnOpts = {}, cleanup = () => {}] = fgArgs\n if (typeof args === 'function') {\n cleanup = args\n spawnOpts = {}\n args = []\n } else if (!!args && typeof args === 'object' && !Array.isArray(args)) {\n if (typeof spawnOpts === 'function') cleanup = spawnOpts\n spawnOpts = args\n args = []\n } else if (typeof spawnOpts === 'function') {\n cleanup = spawnOpts\n spawnOpts = {}\n }\n if (Array.isArray(program)) {\n const [pp, ...pa] = program\n program = pp\n args = pa\n }\n return [program, args, { ...spawnOpts }, cleanup]\n}\n\n/**\n * Spawn the specified program as a \"foreground\" process, or at least as\n * close as is possible given node's lack of exec-without-fork.\n *\n * Cleanup method may be used to modify or ignore the result of the child's\n * exit code or signal. If cleanup returns undefined (or a Promise that\n * resolves to undefined), then the parent will exit in the same way that\n * the child did.\n *\n * Return boolean `false` to prevent the parent's exit entirely.\n */\nexport function foregroundChild(\n cmd: string | string[],\n cleanup?: Cleanup\n): ChildProcess\nexport function foregroundChild(\n program: string,\n args?: string[],\n cleanup?: Cleanup\n): ChildProcess\nexport function foregroundChild(\n program: string,\n spawnOpts?: SpawnOptions,\n cleanup?: Cleanup\n): ChildProcess\nexport function foregroundChild(\n program: string,\n args?: string[],\n spawnOpts?: SpawnOptions,\n cleanup?: Cleanup\n): ChildProcess\nexport function foregroundChild(...fgArgs: FgArgs): ChildProcess {\n const [program, args, spawnOpts, cleanup] = normalizeFgArgs(fgArgs)\n\n spawnOpts.stdio = [0, 1, 2]\n if (process.send) {\n spawnOpts.stdio.push('ipc')\n }\n\n const child = spawn(program, args, spawnOpts)\n\n const unproxySignals = proxySignals(child)\n const childHangup = () => {\n try {\n child.kill('SIGHUP')\n\n /* c8 ignore start */\n } catch (_) {\n // SIGHUP is weird on windows\n child.kill('SIGTERM')\n }\n /* c8 ignore stop */\n }\n const removeOnExit = onExit(childHangup)\n\n const dog = watchdog(child)\n\n let done = false\n child.on('close', async (code, signal) => {\n dog.kill('SIGKILL')\n /* c8 ignore start */\n if (done) {\n return\n }\n /* c8 ignore stop */\n done = true\n const result = cleanup(code, signal)\n const res = isPromise(result) ? await result : result\n removeOnExit()\n unproxySignals()\n\n if (res === false) return\n else if (typeof res === 'string') {\n signal = res\n code = null\n } else if (typeof res === 'number') {\n code = res\n signal = null\n }\n\n if (signal) {\n // If there is nothing else keeping the event loop alive,\n // then there's a race between a graceful exit and getting\n // the signal to this process. Put this timeout here to\n // make sure we're still alive to get the signal, and thus\n // exit with the intended signal code.\n /* istanbul ignore next */\n setTimeout(() => {}, 2000)\n try {\n process.kill(process.pid, signal)\n /* c8 ignore start */\n } catch (_) {\n process.kill(process.pid, 'SIGTERM')\n }\n /* c8 ignore stop */\n } else {\n process.exit(code || 0)\n }\n })\n\n if (process.send) {\n process.removeAllListeners('message')\n\n child.on('message', (message, sendHandle) => {\n process.send?.(message, sendHandle)\n })\n\n process.on('message', (message, sendHandle) => {\n child.send(\n message as Serializable,\n sendHandle as SendHandle | undefined\n )\n })\n }\n\n return child\n}\n\n/**\n * Starts forwarding signals to `child` through `parent`.\n */\nconst proxySignals = (child: ChildProcess) => {\n const listeners = new Map()\n\n for (const sig of allSignals) {\n const listener = () => {\n // some signals can only be received, not sent\n try {\n child.kill(sig)\n /* c8 ignore start */\n } catch (_) {}\n /* c8 ignore stop */\n }\n try {\n // if it's a signal this system doesn't recognize, skip it\n process.on(sig, listener)\n listeners.set(sig, listener)\n /* c8 ignore start */\n } catch (_) {}\n /* c8 ignore stop */\n }\n\n return () => {\n for (const [sig, listener] of listeners) {\n process.removeListener(sig, listener)\n }\n }\n}\n\nconst isPromise = (o: any): o is Promise<any> =>\n !!o && typeof o === 'object' && typeof o.then === 'function'\n"]} |