38 lines
854 B
Plaintext
38 lines
854 B
Plaintext
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow strict
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* @format
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*/
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// flowlint ambiguous-object-type:error
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'use strict';
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/**
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* Recursively "deep" freezes the supplied object.
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*
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* For convenience, and for consistency with the behavior of `Object.freeze`,
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* returns the now-frozen original object.
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*/
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function deepFreeze<T: interface {}>(object: T): T {
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Object.freeze(object);
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Object.getOwnPropertyNames(object).forEach(name => {
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// $FlowFixMe[prop-missing]
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const property = object[name];
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if (
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property &&
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typeof property === 'object' &&
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!Object.isFrozen(property)
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) {
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deepFreeze(property);
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}
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});
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return object;
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}
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module.exports = deepFreeze;
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