@creditkarma/async-hooks
v0.0.8
Published
An Async Hooks polyfill for Node less than 8, written in TypeScript.
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Async Hooks
An Async Hooks polyfill for Node < 8, written in TypeScript.
The idea is to provide an interface identical to the native Async Hooks implementation in older versions of Node. If you import
the library in Node 8+ it will return the native Async Hooks, otherwise it will return the polyfill.
The docs for Async Hooks here.
This implementation is based largely on the work of Andreas Madsen
Install
$ npm install --save @creditkarma/async-hooks
Usage
createHook
Creates a new AsyncHook
object with the supplied callbacks
import * as AsyncHooks from '@creditkarma/async-hooks'
AsyncHooks.createHook({
init(asyncId: number, type: string, triggerAsyncId: number, resource: object): void {
// A new async resouce was created
},
before(asyncId: number): void {
// The callback for async resource will be called
},
after(asyncId: number): void {
// The callback for async resource was called
},
destroy(asyncId: number): void {
// The async resource will be garbage collected
}
}).enable()
In the native implementation of Async Hooks the resource
received by the init
method is the async object that was created. In the polyfill this resource
is likely to not useful and is here for completeness. Usually this will be an empty wrapper object.
executionAsyncId
Returns the unique ID of the currently executing async context.
import * as AsyncHooks from '@creditkarma/async-hooks'
const currentAsyncId: number = AsyncHooks.executionAsyncId()
triggerAsyncId
Returns the unique ID of the parent context for the currently executing async context.
import * as AsyncHooks from '@creditkarma/async-hooks'
const parentAsyncId: number = AsyncHooks.triggerAsyncId()