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58 lines
1.4 KiB
58 lines
1.4 KiB
3 years ago
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"use strict";
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exports.__esModule = true;
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exports["default"] = cssVar;
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var _errors = /*#__PURE__*/_interopRequireDefault( /*#__PURE__*/require("../internalHelpers/_errors"));
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
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var cssVariableRegex = /--[\S]*/g;
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/**
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* Fetches the value of a passed CSS Variable.
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*
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* Passthrough can be enabled (off by default) for when you are unsure of the input and want non-variable values to be returned instead of an error.
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*
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* @example
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* // Styles as object usage
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* const styles = {
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* 'background': cssVar('--background-color'),
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* }
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*
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* // styled-components usage
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* const div = styled.div`
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* background: ${cssVar('--background-color')};
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* `
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*
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* // CSS in JS Output
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*
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* element {
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* 'background': 'red'
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* }
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*/
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function cssVar(cssVariable, passThrough) {
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if (!cssVariable || !cssVariable.match(cssVariableRegex)) {
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if (passThrough) return cssVariable;
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throw new _errors["default"](73);
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}
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var variableValue;
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/* eslint-disable */
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/* istanbul ignore next */
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if (typeof document !== 'undefined' && document.documentElement !== null) {
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variableValue = getComputedStyle(document.documentElement).getPropertyValue(cssVariable);
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}
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/* eslint-enable */
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if (variableValue) {
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return variableValue.trim();
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} else {
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throw new _errors["default"](74);
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}
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}
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module.exports = exports.default;
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