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