'use strict';
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const colorIndexRegExp = /((?:not )?all and )?(\(color-index: *(22|48|70)\))/i;
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const prefersColorSchemeRegExp = /prefers-color-scheme:/i;
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const prefersColorSchemeInit = initialColorScheme => {
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const mediaQueryString = '(prefers-color-scheme: dark)';
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const mediaQueryList = window.matchMedia && matchMedia(mediaQueryString);
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const hasNativeSupport = mediaQueryList && mediaQueryList.media === mediaQueryString;
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const mediaQueryListener = () => {
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set(mediaQueryList.matches ? 'dark' : 'light');
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};
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const removeListener = () => {
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if (mediaQueryList) {
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mediaQueryList.removeListener(mediaQueryListener);
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}
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};
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const set = colorScheme => {
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if (colorScheme !== currentColorScheme) {
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currentColorScheme = colorScheme;
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if (typeof result.onChange === 'function') {
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result.onChange();
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}
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}
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[].forEach.call(document.styleSheets || [], styleSheet => {
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[].forEach.call(styleSheet.cssRules || [], cssRule => {
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const colorSchemeMatch = prefersColorSchemeRegExp.test(Object(cssRule.media).mediaText);
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if (colorSchemeMatch) {
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const index = [].indexOf.call(cssRule.parentStyleSheet.cssRules, cssRule);
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cssRule.parentStyleSheet.deleteRule(index);
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} else {
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const colorIndexMatch = (Object(cssRule.media).mediaText || '').match(colorIndexRegExp);
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if (colorIndexMatch) {
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cssRule.media.mediaText = ((/^dark$/i.test(colorScheme) ? colorIndexMatch[3] === '48' : /^light$/i.test(colorScheme) ? colorIndexMatch[3] === '70' : colorIndexMatch[3] === '22') ? 'not all and ' : '') + cssRule.media.mediaText.replace(colorIndexRegExp, '$2');
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}
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}
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});
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});
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};
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const result = Object.defineProperty({
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hasNativeSupport,
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removeListener
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}, 'scheme', {
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get: () => currentColorScheme,
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set
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}); // initialize the color scheme using the provided value, the system value, or light
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let currentColorScheme = initialColorScheme || (mediaQueryList && mediaQueryList.matches ? 'dark' : 'light');
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set(currentColorScheme); // listen for system changes
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if (mediaQueryList) {
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mediaQueryList.addListener(mediaQueryListener);
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}
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return result;
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};
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module.exports = prefersColorSchemeInit;
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//# sourceMappingURL=index.js.map
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