mimic-fn
Advanced tools
Package description
The mimic-fn package is a utility that allows you to copy the properties of a function onto another function. This includes the function's name, length (the number of arguments it expects), and custom properties. It is useful when you want to wrap a function without losing its original properties, which can be important for debugging, introspection, and certain function-based APIs that rely on these properties.
Copying function properties
This feature allows you to copy all properties from the original function to the wrapper function, including the function name and custom properties.
const mimicFn = require('mimic-fn');
function original() {}
original.customProp = 'hello';
function wrapper() {
return original();
}
console.log(wrapper.name); // 'wrapper'
console.log(wrapper.customProp); // undefined
mimicFn(wrapper, original);
console.log(wrapper.name); // 'original'
console.log(wrapper.customProp); // 'hello'The function-copy package is similar to mimic-fn in that it copies properties from one function to another. However, it may not be as up-to-date or widely used as mimic-fn.
The rename-function package allows you to change the name of a function, which is one aspect of what mimic-fn does. However, it does not handle copying other properties or the function's length.
Readme
Make a function mimic another one
Useful when you wrap a function in another function and like to preserve the original name and other properties.
$ npm install mimic-fn
const mimicFn = require('mimic-fn');
function foo() {}
foo.unicorn = '🦄';
function wrapper() {
return foo();
}
console.log(wrapper.name);
//=> 'wrapper'
mimicFn(wrapper, foo);
console.log(wrapper.name);
//=> 'foo'
console.log(wrapper.unicorn);
//=> '🦄'
It will copy over the properties name, length, displayName, and any custom properties you may have set.
Modifies the to function and returns it.
Type: Function
Mimicking function.
Type: Function
Function to mimic.
MIT © Sindre Sorhus
FAQs
Make a function mimic another one
The npm package mimic-fn receives a total of 46,780,089 weekly downloads. As such, mimic-fn popularity was classified as popular.
We found that mimic-fn demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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