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/*
MIT License http://www.opensource.org/licenses/mit-license.php
*/
"use strict";
/** @template T @typedef {function(): T} FunctionReturning */
/**
* @template T
* @param {FunctionReturning<T>} fn memorized function
* @returns {FunctionReturning<T>} new function
*/
const memoize = fn => {
let cache = false;
/** @type {T} */
let result = undefined;
return () => {
if (cache) {
return result;
} else {
result = fn();
cache = true;
// Allow to clean up memory for fn
// and all dependent resources
fn = undefined;
return result;
}
};
};
module.exports = memoize;