[6a3a178] | 1 | 'use strict';
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| 2 |
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| 3 | const colorIndexRegExp = /((?:not )?all and )?(\(color-index: *(22|48|70)\))/i;
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| 4 | const prefersColorSchemeRegExp = /prefers-color-scheme:/i;
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| 5 |
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| 6 | const prefersColorSchemeInit = initialColorScheme => {
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| 7 | const mediaQueryString = '(prefers-color-scheme: dark)';
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| 8 | const mediaQueryList = window.matchMedia && matchMedia(mediaQueryString);
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| 9 | const hasNativeSupport = mediaQueryList && mediaQueryList.media === mediaQueryString;
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| 10 |
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| 11 | const mediaQueryListener = () => {
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| 12 | set(mediaQueryList.matches ? 'dark' : 'light');
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| 13 | };
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| 14 |
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| 15 | const removeListener = () => {
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| 16 | if (mediaQueryList) {
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| 17 | mediaQueryList.removeListener(mediaQueryListener);
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| 18 | }
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| 19 | };
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| 20 |
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| 21 | const set = colorScheme => {
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| 22 | if (colorScheme !== currentColorScheme) {
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| 23 | currentColorScheme = colorScheme;
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| 24 |
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| 25 | if (typeof result.onChange === 'function') {
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| 26 | result.onChange();
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| 27 | }
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| 28 | }
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| 29 |
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| 30 | [].forEach.call(document.styleSheets || [], styleSheet => {
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| 31 | [].forEach.call(styleSheet.cssRules || [], cssRule => {
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| 32 | const colorSchemeMatch = prefersColorSchemeRegExp.test(Object(cssRule.media).mediaText);
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| 33 |
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| 34 | if (colorSchemeMatch) {
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| 35 | const index = [].indexOf.call(cssRule.parentStyleSheet.cssRules, cssRule);
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| 36 | cssRule.parentStyleSheet.deleteRule(index);
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| 37 | } else {
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| 38 | const colorIndexMatch = (Object(cssRule.media).mediaText || '').match(colorIndexRegExp);
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| 39 |
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| 40 | if (colorIndexMatch) {
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| 41 | 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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| 42 | }
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| 43 | }
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| 44 | });
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| 45 | });
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| 46 | };
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| 47 |
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| 48 | const result = Object.defineProperty({
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| 49 | hasNativeSupport,
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| 50 | removeListener
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| 51 | }, 'scheme', {
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| 52 | get: () => currentColorScheme,
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| 53 | set
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| 54 | }); // initialize the color scheme using the provided value, the system value, or light
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| 55 |
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| 56 | let currentColorScheme = initialColorScheme || (mediaQueryList && mediaQueryList.matches ? 'dark' : 'light');
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| 57 | set(currentColorScheme); // listen for system changes
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| 58 |
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| 59 | if (mediaQueryList) {
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| 60 | mediaQueryList.addListener(mediaQueryListener);
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| 61 | }
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| 62 |
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| 63 | return result;
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| 64 | };
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| 65 |
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| 66 | module.exports = prefersColorSchemeInit;
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| 67 | //# sourceMappingURL=index.js.map
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