36 lines
1.3 KiB
Plaintext
36 lines
1.3 KiB
Plaintext
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/**
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* Copyright (c) 2013-present, Facebook, Inc.
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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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* @providesModule cx
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*/
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/**
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* This function is used to mark string literals representing CSS class names
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* so that they can be transformed statically. This allows for modularization
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* and minification of CSS class names.
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*
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* In static_upstream, this function is actually implemented, but it should
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* eventually be replaced with something more descriptive, and the transform
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* that is used in the main stack should be ported for use elsewhere.
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*
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* @param string|object className to modularize, or an object of key/values.
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* In the object case, the values are conditions that
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* determine if the className keys should be included.
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* @param [string ...] Variable list of classNames in the string case.
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* @return string Renderable space-separated CSS className.
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*/
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function cx(classNames) {
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if (typeof classNames == 'object') {
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return Object.keys(classNames).filter(className => classNames[className]).map(replace).join(' ');
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}
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return Array.prototype.map.call(arguments, replace).join(' ');
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}
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function replace(str) {
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return str.replace(/\//g, '-');
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}
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module.exports = cx;
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