@types/cls-hooked

What is @types/cls-hooked?

@types/cls-hooked provides TypeScript type definitions for the cls-hooked package, which is used for context propagation across asynchronous calls in Node.js. It allows you to create a context that can be accessed throughout the lifecycle of a request, even across asynchronous boundaries.

What are @types/cls-hooked's main functionalities?

Creating a Namespace

This feature allows you to create a new namespace. A namespace is a context that can be used to store and retrieve data across asynchronous calls.

const cls = require('cls-hooked');
const namespace = cls.createNamespace('myNamespace');

Setting and Getting Context

Within a namespace, you can set and get values that will be available throughout the lifecycle of the asynchronous operations.

namespace.run(() => {
  namespace.set('key', 'value');
  console.log(namespace.get('key')); // Outputs: value
});

Binding Functions to a Namespace

You can bind functions to a namespace so that they have access to the context set within that namespace.

const boundFunction = namespace.bind(() => {
  console.log(namespace.get('key'));
});
namespace.run(() => {
  namespace.set('key', 'value');
  boundFunction(); // Outputs: value
});

Other packages similar to @types/cls-hooked

async_hooks

The async_hooks module provides an API to track asynchronous resources in Node.js. It is a lower-level API compared to cls-hooked and requires more manual management of context propagation.

continuation-local-storage

This package is similar to cls-hooked and provides a way to maintain context across asynchronous calls. However, it is older and less maintained compared to cls-hooked.

zone.js

zone.js is a library for managing asynchronous context propagation in JavaScript. It is more commonly used in Angular applications but can be used in Node.js as well. It provides a more comprehensive solution for managing asynchronous contexts.

README

Installation

npm install --save @types/cls-hooked

Summary

This package contains type definitions for cls-hooked (https://github.com/jeff-lewis/cls-hooked).

Details

Files were exported from https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/cls-hooked.

index.d.ts

// Type definitions for cls-hooked 4.3
// Project: https://github.com/jeff-lewis/cls-hooked
// Definitions by: Leo Liang <https://github.com/aleung>
//                 Lucian Buzzo <https://github.com/LucianBuzzo>
// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped

/// <reference types="node" />

import { EventEmitter } from 'events';

export interface Namespace<N = Record<string, any>> {
    active: any;

    set<K extends keyof N = keyof N>(key: K, value: N[K]): N[K];
    get<K extends keyof N = keyof N>(key: K): N[K];
    run(fn: (...args: any[]) => void): void;
    runAndReturn<T>(fn: (...args: any[]) => T): T;
    runPromise<T>(fn: (...args: any[]) => Promise<T>): Promise<T>;
    bind<F extends Function>(fn: F, context?: any): F; // tslint:disable-line: ban-types
    bindEmitter(emitter: EventEmitter): void;
    createContext(): any;
    enter(context: any): void;
    exit(context: any): void;
}

// eslint-disable-next-line no-unnecessary-generics
export function createNamespace<N = Record<string, any>>(name: string): Namespace<N>;
// eslint-disable-next-line no-unnecessary-generics
export function getNamespace<N = Record<string, any>>(name: string): Namespace<N> | undefined;
export function destroyNamespace(name: string): void;
export function reset(): void;

Additional Details

• Last updated: Wed, 14 Jun 2023 14:02:48 GMT
• Dependencies: @types/node
• Global values: none

Credits

These definitions were written by Leo Liang, and Lucian Buzzo.