/** * Copyright (c) Meta Platforms, Inc. and affiliates. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. * @flow */ export let hasBadMapPolyfill: boolean; if (__DEV__) { hasBadMapPolyfill = false; try { const frozenObject = Object.freeze({}); /* eslint-disable no-new */ new Map([[frozenObject, null]]); new Set([frozenObject]); /* eslint-enable no-new */ } catch (e) { // TODO: Consider warning about bad polyfills hasBadMapPolyfill = true; } }