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https://webpack.js.org/plugins/define-plugin/ Webpack's DefinePlugin has the ability to replace `typeof expr` to a constant in compile-time, which should lead to better dead-code-elimination.
15 lines
377 B
JavaScript
15 lines
377 B
JavaScript
/**
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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
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*/
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export const canUseDOM: boolean = !!(
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typeof window !== 'undefined' &&
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typeof window.document !== 'undefined' &&
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typeof window.document.createElement !== 'undefined'
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);
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