import { type ChildProcess as ChildProcessHandle, type ChildProcessWithoutNullStreams, spawn, spawnSync, type StdioOptions,} from "node:child_process"; import type { ServerRuntimeEnvironment } from "@t3tools/contracts";import { Effect, Exit, Scope } from "effect";import { ChildProcess, ChildProcessSpawner } from "effect/unstable/process"; import { detectServerRuntimeEnvironment } from "./runtimeEnvironment"; interface ProcessSpawnBaseOptions { cwd?: string | undefined; env?: NodeJS.ProcessEnv | undefined; runtimeEnvironment?: ServerRuntimeEnvironment | undefined; shell?: boolean | undefined;} interface RuntimeShellOptions { runtimeEnvironment?: ServerRuntimeEnvironment | undefined; shell?: boolean | string | undefined;} interface ProcessSpawnOptions extends ProcessSpawnBaseOptions { stdio?: StdioOptions | undefined; detached?: boolean | undefined;} interface RuntimeCommandOptions extends ChildProcess.CommandOptions { runtimeEnvironment?: ServerRuntimeEnvironment | undefined;} interface ProcessSpawnSyncOptions extends ProcessSpawnBaseOptions { stdio?: StdioOptions | undefined; detached?: boolean | undefined; encoding?: BufferEncoding | undefined; input?: string | undefined;} export interface ProcessRunOptions { cwd?: string | undefined; timeoutMs?: number | undefined; env?: NodeJS.ProcessEnv | undefined; stdin?: string | undefined; allowNonZeroExit?: boolean | undefined; maxBufferBytes?: number | undefined; outputMode?: "error" | "truncate" | undefined; runtimeEnvironment?: ServerRuntimeEnvironment | undefined; shell?: boolean | undefined;} export interface ProcessRunResult { stdout: string; stderr: string; code: number | null; signal: NodeJS.Signals | null; timedOut: boolean; stdoutTruncated?: boolean | undefined; stderrTruncated?: boolean | undefined;} function commandLabel(command: string, args: readonly string[]): string { return [command, ...args].join(" ");} function resolveRuntimeEnvironment( runtimeEnvironment: ServerRuntimeEnvironment | undefined,): ServerRuntimeEnvironment { return runtimeEnvironment ?? detectServerRuntimeEnvironment();} function shouldUseShell(options: RuntimeShellOptions): boolean | string { if (options.shell !== undefined) { return options.shell; } return resolveRuntimeEnvironment(options.runtimeEnvironment).platform === "windows";} function toSpawnOptions(options: ProcessSpawnOptions) { return { cwd: options.cwd, env: options.env, shell: shouldUseShell(options), ...(options.stdio !== undefined ? { stdio: options.stdio } : {}), ...(options.detached !== undefined ? { detached: options.detached } : {}), };} function toRuntimeCommandOptions( options: RuntimeCommandOptions = {},): ChildProcess.CommandOptions { const { runtimeEnvironment: _, ...rest } = options; return { ...rest, shell: options.shell ?? shouldUseShell(options), };} export function makeRuntimeCommand( command: string, args: ReadonlyArray<string>, options: RuntimeCommandOptions = {},): ChildProcess.StandardCommand { return ChildProcess.make(command, [...args], toRuntimeCommandOptions(options));} interface ManagedChildProcess { readonly scope: Scope.Closeable; readonly handle: ChildProcessSpawner.ChildProcessHandle;} export const spawnManagedCommand = (command: ChildProcess.Command) => Effect.gen(function* () { const scope = yield* Scope.make("sequential"); const spawner = yield* ChildProcessSpawner.ChildProcessSpawner; const handle = yield* spawner.spawn(command).pipe( Scope.provide(scope), Effect.tapError(() => Scope.close(scope, Exit.void)), ); return { scope, handle, } satisfies ManagedChildProcess; }); function spawnProcess( command: string, args: readonly string[], options: ProcessSpawnOptions = {},): ChildProcessHandle { return spawn(command, args, toSpawnOptions(options));} function spawnPipedProcess( command: string, args: readonly string[], options: Omit<ProcessSpawnOptions, "stdio" | "detached"> = {},): ChildProcessWithoutNullStreams { return spawnProcess(command, args, { ...options, stdio: "pipe", }) as ChildProcessWithoutNullStreams;} export function spawnProcessSync( command: string, args: readonly string[], options: ProcessSpawnSyncOptions = {},) { return spawnSync(command, args, { cwd: options.cwd, env: options.env, shell: shouldUseShell(options), encoding: options.encoding ?? "utf8", ...(options.stdio !== undefined ? { stdio: options.stdio } : {}), ...(options.detached !== undefined ? { detached: options.detached } : {}), ...(options.input !== undefined ? { input: options.input } : {}), });} export function spawnDetachedProcess( command: string, args: readonly string[], options: Omit<ProcessSpawnOptions, "stdio" | "detached"> = {},): Promise<void> { return new Promise<void>((resolve, reject) => { const child = spawnProcess(command, args, { ...options, detached: true, stdio: "ignore", }); const handleSpawn = () => { child.unref(); resolve(); }; child.once("spawn", handleSpawn); child.once("error", (error) => { reject(normalizeSpawnError(command, args, error)); }); });} function normalizeSpawnError(command: string, args: readonly string[], error: unknown): Error { if (!(error instanceof Error)) { return new Error(`Failed to run ${commandLabel(command, args)}.`); } const maybeCode = (error as NodeJS.ErrnoException).code; if (maybeCode === "ENOENT") { return new Error(`Command not found: ${command}`); } return new Error(`Failed to run ${commandLabel(command, args)}: ${error.message}`);} function isWindowsCommandNotFound( code: number | null, stderr: string, runtimeEnvironment?: ServerRuntimeEnvironment,): boolean { if (resolveRuntimeEnvironment(runtimeEnvironment).platform !== "windows") return false; if (code === 9009) return true; return /is not recognized as an internal or external command/i.test(stderr);} function normalizeExitError( command: string, args: readonly string[], result: ProcessRunResult, runtimeEnvironment?: ServerRuntimeEnvironment,): Error { if (isWindowsCommandNotFound(result.code, result.stderr, runtimeEnvironment)) { return new Error(`Command not found: ${command}`); } const reason = result.timedOut ? "timed out" : `failed (code=${result.code ?? "null"}, signal=${result.signal ?? "null"})`; const stderr = result.stderr.trim(); const detail = stderr.length > 0 ? ` ${stderr}` : ""; return new Error(`${commandLabel(command, args)} ${reason}.${detail}`);} function normalizeStdinError(command: string, args: readonly string[], error: unknown): Error { if (!(error instanceof Error)) { return new Error(`Failed to write stdin for ${commandLabel(command, args)}.`); } return new Error(`Failed to write stdin for ${commandLabel(command, args)}: ${error.message}`);} function normalizeBufferError( command: string, args: readonly string[], stream: "stdout" | "stderr", maxBufferBytes: number,): Error { return new Error( `${commandLabel(command, args)} exceeded ${stream} buffer limit (${maxBufferBytes} bytes).`, );} const DEFAULT_MAX_BUFFER_BYTES = 8 * 1024 * 1024; /** * On Windows with `shell: true`, `child.kill()` only terminates the `cmd.exe` * wrapper, leaving the actual command running. Use `taskkill /T` to kill the * entire process tree instead. */function killProcessTree( child: ChildProcessHandle, options: { runtimeEnvironment?: ServerRuntimeEnvironment | undefined; signal?: NodeJS.Signals | undefined; } = {},): void { const signal = options.signal ?? "SIGTERM"; if ( resolveRuntimeEnvironment(options.runtimeEnvironment).platform === "windows" && child.pid !== undefined ) { try { const result = spawnProcessSync("taskkill", ["/pid", String(child.pid), "/T", "/F"], { stdio: "ignore", shell: false, runtimeEnvironment: options.runtimeEnvironment, }); if (!result.error && result.status === 0) { return; } if (result.error) { throw result.error; } } catch { // fallback to direct kill } } child.kill(signal);} function appendChunkWithinLimit( target: string, currentBytes: number, chunk: Buffer, maxBytes: number,): { next: string; nextBytes: number; truncated: boolean;} { const remaining = maxBytes - currentBytes; if (remaining <= 0) { return { next: target, nextBytes: currentBytes, truncated: true }; } if (chunk.length <= remaining) { return { next: `${target}${chunk.toString()}`, nextBytes: currentBytes + chunk.length, truncated: false, }; } return { next: `${target}${chunk.subarray(0, remaining).toString()}`, nextBytes: currentBytes + remaining, truncated: true, };} export async function runProcess( command: string, args: readonly string[], options: ProcessRunOptions = {},): Promise<ProcessRunResult> { const timeoutMs = options.timeoutMs ?? 60_000; const maxBufferBytes = options.maxBufferBytes ?? DEFAULT_MAX_BUFFER_BYTES; const outputMode = options.outputMode ?? "error"; return new Promise<ProcessRunResult>((resolve, reject) => { const child = spawnPipedProcess(command, args, options); let stdout = ""; let stderr = ""; let stdoutBytes = 0; let stderrBytes = 0; let stdoutTruncated = false; let stderrTruncated = false; let timedOut = false; let settled = false; let forceKillTimer: ReturnType<typeof setTimeout> | null = null; const timeoutTimer = setTimeout(() => { timedOut = true; killProcessTree(child, { runtimeEnvironment: options.runtimeEnvironment, signal: "SIGTERM", }); forceKillTimer = setTimeout(() => { killProcessTree(child, { runtimeEnvironment: options.runtimeEnvironment, signal: "SIGKILL", }); }, 1_000); }, timeoutMs); const finalize = (callback: () => void): void => { if (settled) return; settled = true; clearTimeout(timeoutTimer); if (forceKillTimer) { clearTimeout(forceKillTimer); } callback(); }; const fail = (error: Error): void => { killProcessTree(child, { runtimeEnvironment: options.runtimeEnvironment, signal: "SIGTERM", }); finalize(() => { reject(error); }); }; const appendOutput = (stream: "stdout" | "stderr", chunk: Buffer | string): Error | null => { const chunkBuffer = typeof chunk === "string" ? Buffer.from(chunk) : chunk; const text = chunkBuffer.toString(); const byteLength = chunkBuffer.length; if (stream === "stdout") { if (outputMode === "truncate") { const appended = appendChunkWithinLimit(stdout, stdoutBytes, chunkBuffer, maxBufferBytes); stdout = appended.next; stdoutBytes = appended.nextBytes; stdoutTruncated = stdoutTruncated || appended.truncated; return null; } stdout += text; stdoutBytes += byteLength; if (stdoutBytes > maxBufferBytes) { return normalizeBufferError(command, args, "stdout", maxBufferBytes); } } else { if (outputMode === "truncate") { const appended = appendChunkWithinLimit(stderr, stderrBytes, chunkBuffer, maxBufferBytes); stderr = appended.next; stderrBytes = appended.nextBytes; stderrTruncated = stderrTruncated || appended.truncated; return null; } stderr += text; stderrBytes += byteLength; if (stderrBytes > maxBufferBytes) { return normalizeBufferError(command, args, "stderr", maxBufferBytes); } } return null; }; child.stdout.on("data", (chunk: Buffer | string) => { const error = appendOutput("stdout", chunk); if (error) { fail(error); } }); child.stderr.on("data", (chunk: Buffer | string) => { const error = appendOutput("stderr", chunk); if (error) { fail(error); } }); child.once("error", (error) => { finalize(() => { reject(normalizeSpawnError(command, args, error)); }); }); child.once("close", (code, signal) => { const result: ProcessRunResult = { stdout, stderr, code, signal, timedOut, stdoutTruncated, stderrTruncated, }; finalize(() => { if (!options.allowNonZeroExit && (timedOut || (code !== null && code !== 0))) { reject(normalizeExitError(command, args, result, options.runtimeEnvironment)); return; } resolve(result); }); }); child.stdin.once("error", (error) => { fail(normalizeStdinError(command, args, error)); }); if (options.stdin !== undefined) { child.stdin.write(options.stdin, (error) => { if (error) { fail(normalizeStdinError(command, args, error)); return; } child.stdin.end(); }); return; } child.stdin.end(); });}
import {
type ChildProcess as ChildProcessHandle,
type ChildProcessWithoutNullStreams,
spawn,
spawnSync,
type StdioOptions,
} from "node:child_process";
import type { ServerRuntimeEnvironment } from "@t3tools/contracts";
import { Effect, Exit, Scope } from "effect";
import { ChildProcess, ChildProcessSpawner } from "effect/unstable/process";
import { detectServerRuntimeEnvironment } from "./runtimeEnvironment";
interface ProcessSpawnBaseOptions {
cwd?: string | undefined;
env?: NodeJS.ProcessEnv | undefined;
runtimeEnvironment?: ServerRuntimeEnvironment | undefined;
shell?: boolean | undefined;
}
interface RuntimeShellOptions {
runtimeEnvironment?: ServerRuntimeEnvironment | undefined;
shell?: boolean | string | undefined;
}
interface ProcessSpawnOptions extends ProcessSpawnBaseOptions {
stdio?: StdioOptions | undefined;
detached?: boolean | undefined;
}
interface RuntimeCommandOptions extends ChildProcess.CommandOptions {
runtimeEnvironment?: ServerRuntimeEnvironment | undefined;
}
interface ProcessSpawnSyncOptions extends ProcessSpawnBaseOptions {
stdio?: StdioOptions | undefined;
detached?: boolean | undefined;
encoding?: BufferEncoding | undefined;
input?: string | undefined;
}
export interface ProcessRunOptions {
cwd?: string | undefined;
timeoutMs?: number | undefined;
env?: NodeJS.ProcessEnv | undefined;
stdin?: string | undefined;
allowNonZeroExit?: boolean | undefined;
maxBufferBytes?: number | undefined;
outputMode?: "error" | "truncate" | undefined;
runtimeEnvironment?: ServerRuntimeEnvironment | undefined;
shell?: boolean | undefined;
}
export interface ProcessRunResult {
stdout: string;
stderr: string;
code: number | null;
signal: NodeJS.Signals | null;
timedOut: boolean;
stdoutTruncated?: boolean | undefined;
stderrTruncated?: boolean | undefined;
}
function commandLabel(command: string, args: readonly string[]): string {
return [command, ...args].join(" ");
}
function resolveRuntimeEnvironment(
runtimeEnvironment: ServerRuntimeEnvironment | undefined,
): ServerRuntimeEnvironment {
return runtimeEnvironment ?? detectServerRuntimeEnvironment();
}
function shouldUseShell(options: RuntimeShellOptions): boolean | string {
if (options.shell !== undefined) {
return options.shell;
}
return resolveRuntimeEnvironment(options.runtimeEnvironment).platform === "windows";
}
function toSpawnOptions(options: ProcessSpawnOptions) {
return {
cwd: options.cwd,
env: options.env,
shell: shouldUseShell(options),
...(options.stdio !== undefined ? { stdio: options.stdio } : {}),
...(options.detached !== undefined ? { detached: options.detached } : {}),
};
}
function toRuntimeCommandOptions(
options: RuntimeCommandOptions = {},
): ChildProcess.CommandOptions {
const { runtimeEnvironment: _, ...rest } = options;
return {
...rest,
shell: options.shell ?? shouldUseShell(options),
};
}
export function makeRuntimeCommand(
command: string,
args: ReadonlyArray<string>,
options: RuntimeCommandOptions = {},
): ChildProcess.StandardCommand {
return ChildProcess.make(command, [...args], toRuntimeCommandOptions(options));
}
interface ManagedChildProcess {
readonly scope: Scope.Closeable;
readonly handle: ChildProcessSpawner.ChildProcessHandle;
}
export const spawnManagedCommand = (command: ChildProcess.Command) =>
Effect.gen(function* () {
const scope = yield* Scope.make("sequential");
const spawner = yield* ChildProcessSpawner.ChildProcessSpawner;
const handle = yield* spawner.spawn(command).pipe(
Scope.provide(scope),
Effect.tapError(() => Scope.close(scope, Exit.void)),
);
return {
scope,
handle,
} satisfies ManagedChildProcess;
});
function spawnProcess(
command: string,
args: readonly string[],
options: ProcessSpawnOptions = {},
): ChildProcessHandle {
return spawn(command, args, toSpawnOptions(options));
}
function spawnPipedProcess(
command: string,
args: readonly string[],
options: Omit<ProcessSpawnOptions, "stdio" | "detached"> = {},
): ChildProcessWithoutNullStreams {
return spawnProcess(command, args, {
...options,
stdio: "pipe",
}) as ChildProcessWithoutNullStreams;
}
export function spawnProcessSync(
command: string,
args: readonly string[],
options: ProcessSpawnSyncOptions = {},
) {
return spawnSync(command, args, {
cwd: options.cwd,
env: options.env,
shell: shouldUseShell(options),
encoding: options.encoding ?? "utf8",
...(options.stdio !== undefined ? { stdio: options.stdio } : {}),
...(options.detached !== undefined ? { detached: options.detached } : {}),
...(options.input !== undefined ? { input: options.input } : {}),
});
}
export function spawnDetachedProcess(
command: string,
args: readonly string[],
options: Omit<ProcessSpawnOptions, "stdio" | "detached"> = {},
): Promise<void> {
return new Promise<void>((resolve, reject) => {
const child = spawnProcess(command, args, {
...options,
detached: true,
stdio: "ignore",
});
const handleSpawn = () => {
child.unref();
resolve();
};
child.once("spawn", handleSpawn);
child.once("error", (error) => {
reject(normalizeSpawnError(command, args, error));
});
});
}
function normalizeSpawnError(command: string, args: readonly string[], error: unknown): Error {
if (!(error instanceof Error)) {
return new Error(`Failed to run ${commandLabel(command, args)}.`);
}
const maybeCode = (error as NodeJS.ErrnoException).code;
if (maybeCode === "ENOENT") {
return new Error(`Command not found: ${command}`);
}
return new Error(`Failed to run ${commandLabel(command, args)}: ${error.message}`);
}
function isWindowsCommandNotFound(
code: number | null,
stderr: string,
runtimeEnvironment?: ServerRuntimeEnvironment,
): boolean {
if (resolveRuntimeEnvironment(runtimeEnvironment).platform !== "windows") return false;
if (code === 9009) return true;
return /is not recognized as an internal or external command/i.test(stderr);
}
function normalizeExitError(
command: string,
args: readonly string[],
result: ProcessRunResult,
runtimeEnvironment?: ServerRuntimeEnvironment,
): Error {
if (isWindowsCommandNotFound(result.code, result.stderr, runtimeEnvironment)) {
return new Error(`Command not found: ${command}`);
}
const reason = result.timedOut
? "timed out"
: `failed (code=${result.code ?? "null"}, signal=${result.signal ?? "null"})`;
const stderr = result.stderr.trim();
const detail = stderr.length > 0 ? ` ${stderr}` : "";
return new Error(`${commandLabel(command, args)} ${reason}.${detail}`);
}
function normalizeStdinError(command: string, args: readonly string[], error: unknown): Error {
if (!(error instanceof Error)) {
return new Error(`Failed to write stdin for ${commandLabel(command, args)}.`);
}
return new Error(`Failed to write stdin for ${commandLabel(command, args)}: ${error.message}`);
}
function normalizeBufferError(
command: string,
args: readonly string[],
stream: "stdout" | "stderr",
maxBufferBytes: number,
): Error {
return new Error(
`${commandLabel(command, args)} exceeded ${stream} buffer limit (${maxBufferBytes} bytes).`,
);
}
const DEFAULT_MAX_BUFFER_BYTES = 8 * 1024 * 1024;
/**
* On Windows with `shell: true`, `child.kill()` only terminates the `cmd.exe`
* wrapper, leaving the actual command running. Use `taskkill /T` to kill the
* entire process tree instead.
*/
function killProcessTree(
child: ChildProcessHandle,
options: {
runtimeEnvironment?: ServerRuntimeEnvironment | undefined;
signal?: NodeJS.Signals | undefined;
} = {},
): void {
const signal = options.signal ?? "SIGTERM";
if (
resolveRuntimeEnvironment(options.runtimeEnvironment).platform === "windows" &&
child.pid !== undefined
) {
try {
const result = spawnProcessSync("taskkill", ["/pid", String(child.pid), "/T", "/F"], {
stdio: "ignore",
shell: false,
runtimeEnvironment: options.runtimeEnvironment,
});
if (!result.error && result.status === 0) {
return;
}
if (result.error) {
throw result.error;
}
} catch {
// fallback to direct kill
}
}
child.kill(signal);
}
function appendChunkWithinLimit(
target: string,
currentBytes: number,
chunk: Buffer,
maxBytes: number,
): {
next: string;
nextBytes: number;
truncated: boolean;
} {
const remaining = maxBytes - currentBytes;
if (remaining <= 0) {
return { next: target, nextBytes: currentBytes, truncated: true };
}
if (chunk.length <= remaining) {
return {
next: `${target}${chunk.toString()}`,
nextBytes: currentBytes + chunk.length,
truncated: false,
};
}
return {
next: `${target}${chunk.subarray(0, remaining).toString()}`,
nextBytes: currentBytes + remaining,
truncated: true,
};
}
export async function runProcess(
command: string,
args: readonly string[],
options: ProcessRunOptions = {},
): Promise<ProcessRunResult> {
const timeoutMs = options.timeoutMs ?? 60_000;
const maxBufferBytes = options.maxBufferBytes ?? DEFAULT_MAX_BUFFER_BYTES;
const outputMode = options.outputMode ?? "error";
return new Promise<ProcessRunResult>((resolve, reject) => {
const child = spawnPipedProcess(command, args, options);
let stdout = "";
let stderr = "";
let stdoutBytes = 0;
let stderrBytes = 0;
let stdoutTruncated = false;
let stderrTruncated = false;
let timedOut = false;
let settled = false;
let forceKillTimer: ReturnType<typeof setTimeout> | null = null;
const timeoutTimer = setTimeout(() => {
timedOut = true;
killProcessTree(child, {
runtimeEnvironment: options.runtimeEnvironment,
signal: "SIGTERM",
});
forceKillTimer = setTimeout(() => {
killProcessTree(child, {
runtimeEnvironment: options.runtimeEnvironment,
signal: "SIGKILL",
});
}, 1_000);
}, timeoutMs);
const finalize = (callback: () => void): void => {
if (settled) return;
settled = true;
clearTimeout(timeoutTimer);
if (forceKillTimer) {
clearTimeout(forceKillTimer);
}
callback();
};
const fail = (error: Error): void => {
killProcessTree(child, {
runtimeEnvironment: options.runtimeEnvironment,
signal: "SIGTERM",
});
finalize(() => {
reject(error);
});
};
const appendOutput = (stream: "stdout" | "stderr", chunk: Buffer | string): Error | null => {
const chunkBuffer = typeof chunk === "string" ? Buffer.from(chunk) : chunk;
const text = chunkBuffer.toString();
const byteLength = chunkBuffer.length;
if (stream === "stdout") {
if (outputMode === "truncate") {
const appended = appendChunkWithinLimit(stdout, stdoutBytes, chunkBuffer, maxBufferBytes);
stdout = appended.next;
stdoutBytes = appended.nextBytes;
stdoutTruncated = stdoutTruncated || appended.truncated;
return null;
}
stdout += text;
stdoutBytes += byteLength;
if (stdoutBytes > maxBufferBytes) {
return normalizeBufferError(command, args, "stdout", maxBufferBytes);
}
} else {
if (outputMode === "truncate") {
const appended = appendChunkWithinLimit(stderr, stderrBytes, chunkBuffer, maxBufferBytes);
stderr = appended.next;
stderrBytes = appended.nextBytes;
stderrTruncated = stderrTruncated || appended.truncated;
return null;
}
stderr += text;
stderrBytes += byteLength;
if (stderrBytes > maxBufferBytes) {
return normalizeBufferError(command, args, "stderr", maxBufferBytes);
}
}
return null;
};
child.stdout.on("data", (chunk: Buffer | string) => {
const error = appendOutput("stdout", chunk);
if (error) {
fail(error);
}
});
child.stderr.on("data", (chunk: Buffer | string) => {
const error = appendOutput("stderr", chunk);
if (error) {
fail(error);
}
});
child.once("error", (error) => {
finalize(() => {
reject(normalizeSpawnError(command, args, error));
});
});
child.once("close", (code, signal) => {
const result: ProcessRunResult = {
stdout,
stderr,
code,
signal,
timedOut,
stdoutTruncated,
stderrTruncated,
};
finalize(() => {
if (!options.allowNonZeroExit && (timedOut || (code !== null && code !== 0))) {
reject(normalizeExitError(command, args, result, options.runtimeEnvironment));
return;
}
resolve(result);
});
});
child.stdin.once("error", (error) => {
fail(normalizeStdinError(command, args, error));
});
if (options.stdin !== undefined) {
child.stdin.write(options.stdin, (error) => {
if (error) {
fail(normalizeStdinError(command, args, error));
return;
}
child.stdin.end();
});
return;
}
child.stdin.end();
});
}