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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/react-native/Libraries/Utilities
Просмотр файла: FeatureDetection.js
/**
* 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
* @format
*/
/**
* @return whether or not a @param {function} f is provided natively by calling
* `toString` and check if the result includes `[native code]` in it.
*
* Note that a polyfill can technically fake this behavior but few does it.
* Therefore, this is usually good enough for our purpose.
*/
export function isNativeFunction(f: Function): boolean {
return typeof f === 'function' && f.toString().indexOf('[native code]') > -1;
}
/**
* @return whether or not the constructor of @param {object} o is an native
* function named with @param {string} expectedName.
*/
export function hasNativeConstructor(o: Object, expectedName: string): boolean {
const con = Object.getPrototypeOf(o).constructor;
return con.name === expectedName && isNativeFunction(con);
}
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