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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;