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// @flow let weakMemoize = function<Arg, Return>(func: Arg => Return): Arg => Return { // $FlowFixMe flow doesn't include all non-primitive types as allowed for weakmaps let cache: WeakMap<Arg, Return> = new WeakMap() return arg => { if (cache.has(arg)) { // $FlowFixMe return cache.get(arg) } let ret = func(arg) cache.set(arg, ret) return ret } } export default weakMemoize