mirror of
https://github.com/flarum/framework.git
synced 2025-01-21 16:26:13 +08:00
55 lines
2.6 KiB
TypeScript
55 lines
2.6 KiB
TypeScript
/**
|
||
* Extend an object's method by running its output through a mutating callback
|
||
* every time it is called.
|
||
*
|
||
* The callback accepts the method's return value and should perform any
|
||
* mutations directly on this value. For this reason, this function will not be
|
||
* effective on methods which return scalar values (numbers, strings, booleans).
|
||
*
|
||
* Care should be taken to extend the correct object – in most cases, a class'
|
||
* prototype will be the desired target of extension, not the class itself.
|
||
*
|
||
* @example <caption>Example usage of extending one method.</caption>
|
||
* extend(Discussion.prototype, 'badges', function(badges) {
|
||
* // do something with `badges`
|
||
* });
|
||
*
|
||
* @example <caption>Example usage of extending multiple methods.</caption>
|
||
* extend(IndexPage.prototype, ['oncreate', 'onupdate'], function(vnode) {
|
||
* // something that needs to be run on creation and update
|
||
* });
|
||
*
|
||
* @param object The object that owns the method
|
||
* @param methods The name or names of the method(s) to extend
|
||
* @param callback A callback which mutates the method's output
|
||
*/
|
||
export declare function extend<T extends object, K extends KeyOfType<T, Function>>(object: T, methods: K | K[], callback: (this: T, val: ReturnType<T[K]>, ...args: Parameters<T[K]>) => void): void;
|
||
/**
|
||
* Override an object's method by replacing it with a new function, so that the
|
||
* new function will be run every time the object's method is called.
|
||
*
|
||
* The replacement function accepts the original method as its first argument,
|
||
* which is like a call to `super`. Any arguments passed to the original method
|
||
* are also passed to the replacement.
|
||
*
|
||
* Care should be taken to extend the correct object – in most cases, a class'
|
||
* prototype will be the desired target of extension, not the class itself.
|
||
*
|
||
* @example <caption>Example usage of overriding one method.</caption>
|
||
* override(Discussion.prototype, 'badges', function(original) {
|
||
* const badges = original();
|
||
* // do something with badges
|
||
* return badges;
|
||
* });
|
||
*
|
||
* @example <caption>Example usage of overriding multiple methods.</caption>
|
||
* extend(Discussion.prototype, ['oncreate', 'onupdate'], function(original, vnode) {
|
||
* // something that needs to be run on creation and update
|
||
* });
|
||
*
|
||
* @param object The object that owns the method
|
||
* @param methods The name or names of the method(s) to override
|
||
* @param newMethod The method to replace it with
|
||
*/
|
||
export declare function override<T extends object, K extends KeyOfType<T, Function>>(object: T, methods: K | K[], newMethod: (this: T, orig: T[K], ...args: Parameters<T[K]>) => void): void;
|