promisify-node/utils/cloneFunction.js at master · nodegit/promisify-node · GitHub

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/**

* Clones a function, including copying any properties of the function to the clone.

* @param {Function} func - The function to clone.

module.exports = function cloneFn(func) {

var temp;

// Check for the memoized value on the function in-case we get called to wrap the same function

// (or already wrapped function) again.

return func.__cloneFn || (temp = function() {

return func.apply(this, arguments);

}) &&

// Assign __proto__ as a quick way to copy function properties.

(temp.__proto__ = func) &&

// Lastly, set a cache var on the original and clone, and return the result.

(func.__cloneFn = temp.__cloneFn = temp);

};

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