@igor.dvlpr/hook
v1.1.0
Published
🪝 Hooks onto a JavaScript prototype, either extending or changing its behavior or replacing it completely. 👺
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📃 Table of contents
🕵🏼 Usage
Install it by executing:
npm i "@igor.dvlpr/hook"
🤹🏼 API
[!CAUTION] This package provides ways of modifying the native prototype(s) of built-in JavaScript objects, use it only if you know what you're doing and with caution as it may cause unexpected results!
hook(): boolean
function hook(
proto: Prototype,
method: string,
handler: NativeMethodHook<Prototype, Method>,
replace: boolean = false
): boolean
Hooks onto a JavaScript prototype in order to extend, modify or completely replace a given method of it.
proto
A prototype, e.g. Array.prototype
, Number.prototype
, etc.
method
A method to hook onto, e.g. push
of Array.prototype
.
handler
A custom function to run when the hooked method is called. The function has the following signature:
(
this: Type,
native: Type[Method],
...args: any[]
) => ReturnType<Type[Method]>
this
will be resolved to the provided prototype.
native
is the native method that's being overridden, with its original signature.
...args: any[]
all other arguments passed after the native
method.
ReturnType<Type[Method]>
the return type of the handler is the same as the native
method is.
replace
A Boolean indicating whether the prototype method should be replaced completely.
Defaults to false.
Returns a Boolean whether the hooking onto was successful.
✨ Examples
import { hook } from '@igor.dvlpr/hook'
hook(Array.prototype, 'unshift', function (native, x) {
// any code can be here,
// not just owned by the prototype
// you're hooking/replacing
native(512)
this.push(x / 2)
// must adhere to the original method's
// return type
// see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/unshift#return_value
return this.length // returns 3
})
const array: number[] = []
array.unshift(256)
console.log(array) // [512, 256, 128]
📝 Changelog
📑 Changelog is available here: CHANGELOG.md.
🪪 License
Licensed under the MIT license which is available here, MIT license.
🧬 Related
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💊 NormalizedString provides you with a String type with consistent line-endings, guaranteed. 📮
🎡 Parse, manage, compare and output SemVer-compatible version numbers. 🛡
👨🏻💻 Author
Created by Igor Dimitrijević (@igorskyflyer).