procxy / ChildCrashedError

Class: ChildCrashedError

Defined in: src/shared/errors.ts:191

Thrown when the child process exits or is killed while the proxy is active.

Remarks

When a child crash is detected, all in-flight method calls are immediately rejected with this error. The proxy object becomes inert — subsequent calls also reject until you create a new proxy with procxy() again.

Common causes:

• An uncaught exception or unhandled rejection inside the child class
• OOM kill from the OS
• An external SIGKILL / SIGTERM signal
• Calling $terminate() from the parent

After catching this error, inspect exitCode and signal to determine whether the crash was expected (e.g., signal === 'SIGTERM' after you called $terminate()) or unexpected.

Example

import { procxy, ChildCrashedError } from 'procxy';
import { MyWorker } from './worker.js';

const worker = await procxy(MyWorker);
try {
  await worker.doWork();
} catch (err) {
  if (err instanceof ChildCrashedError) {
    console.error(
      `Child exited: code=${err.exitCode}, signal=${err.signal}`
    );
    // Spawn a fresh proxy if you need to recover
  }
}

Extends

• ProcxyError

Constructors

Constructor

new ChildCrashedError(
   exitCode?, 
   signal?, 
   context?): ChildCrashedError;

Defined in: src/shared/errors.ts:192

Parameters

Parameter	Type	Description
exitCode?	number | null	Process exit code, or null if the process was terminated by a signal
signal?	string | null	Signal name (e.g. 'SIGTERM') that terminated the process, or null if it exited normally
context?	Record<string, unknown>	-

Returns

ChildCrashedError

Overrides

ProcxyError.constructor

Properties

Property	Modifier	Type	Description	Inherited from	Defined in
cause?	public	unknown	-	ProcxyError.cause	node_modules/.pnpm/typescript@6.0.2/node_modules/typescript/lib/lib.es2022.error.d.ts:24
context?	readonly	Record<string, unknown>	-	ProcxyError.context	src/shared/errors.ts:45
exitCode?	readonly	number | null	Process exit code, or null if the process was terminated by a signal	-	src/shared/errors.ts:194
message	public	string	-	ProcxyError.message	node_modules/.pnpm/typescript@6.0.2/node_modules/typescript/lib/lib.es5.d.ts:1075
name	public	string	-	ProcxyError.name	node_modules/.pnpm/typescript@6.0.2/node_modules/typescript/lib/lib.es5.d.ts:1074
signal?	readonly	string | null	Signal name (e.g. 'SIGTERM') that terminated the process, or null if it exited normally	-	src/shared/errors.ts:196
stack?	public	string	-	ProcxyError.stack	node_modules/.pnpm/typescript@6.0.2/node_modules/typescript/lib/lib.es5.d.ts:1076
stackTraceLimit	static	number	The Error.stackTraceLimit property specifies the number of stack frames collected by a stack trace (whether generated by new Error().stack or Error.captureStackTrace(obj)). The default value is 10 but may be set to any valid JavaScript number. Changes will affect any stack trace captured after the value has been changed. If set to a non-number value, or set to a negative number, stack traces will not capture any frames.	ProcxyError.stackTraceLimit	node_modules/.pnpm/@types+node@25.6.0/node_modules/@types/node/globals.d.ts:67

Methods

captureStackTrace()

static captureStackTrace(targetObject, constructorOpt?): void;

Defined in: node_modules/.pnpm/@types+node@25.6.0/node_modules/@types/node/globals.d.ts:51

Creates a .stack property on targetObject, which when accessed returns a string representing the location in the code at which Error.captureStackTrace() was called.

const myObject = {};
Error.captureStackTrace(myObject);
myObject.stack;  // Similar to `new Error().stack`

The first line of the trace will be prefixed with ${myObject.name}: ${myObject.message}.

The optional constructorOpt argument accepts a function. If given, all frames above constructorOpt, including constructorOpt, will be omitted from the generated stack trace.

The constructorOpt argument is useful for hiding implementation details of error generation from the user. For instance:

function a() {
  b();
}

function b() {
  c();
}

function c() {
  // Create an error without stack trace to avoid calculating the stack trace twice.
  const { stackTraceLimit } = Error;
  Error.stackTraceLimit = 0;
  const error = new Error();
  Error.stackTraceLimit = stackTraceLimit;

  // Capture the stack trace above function b
  Error.captureStackTrace(error, b); // Neither function c, nor b is included in the stack trace
  throw error;
}

a();

Parameters

Parameter	Type
targetObject	object
constructorOpt?	Function

Returns

void

Inherited from

ProcxyError.captureStackTrace

---

prepareStackTrace()

static prepareStackTrace(err, stackTraces): any;

Defined in: node_modules/.pnpm/@types+node@25.6.0/node_modules/@types/node/globals.d.ts:55

Parameters

Parameter	Type
err	Error
stackTraces	CallSite[]

Returns

any

See

https://v8.dev/docs/stack-trace-api#customizing-stack-traces

Inherited from

ProcxyError.prepareStackTrace