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34 lines
1.3 KiB
JavaScript
34 lines
1.3 KiB
JavaScript
/* eslint-disable no-empty, no-var, prefer-destructuring */
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// this function is converted to a string verbatim, substitutions are made to insert dynamic values, minified, and then
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// finally exported as an inline `<script>` tag in ThemeScript.tsx for _document.tsx to use.
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export const clientScript = () => {
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// `try/catch` in case I messed something up here bigly... (will default to light theme)
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try {
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// help minifier minify
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var light = "light";
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var dark = "dark";
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var newTheme;
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// the list of <html>'s current class(es)...
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var classList = document.documentElement.classList;
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// map of theme -> classname
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var classNames = "__CLASS_NAMES__";
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// user's saved preference
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var pref = window.localStorage.getItem("__STORAGE_KEY__");
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if (pref === light || pref === dark) {
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// simply restore the local storage preference
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newTheme = pref;
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} else {
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// test CSS media query for system dark mode preference
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// https://stackoverflow.com/a/57795495/1438024
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newTheme = window.matchMedia("__MEDIA_QUERY__").matches ? dark : light;
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}
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// remove both `classNames` to start fresh...
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classList.remove(classNames[light], classNames[dark]);
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// ...and then FINALLY set the root class
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classList.add(classNames[newTheme]);
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} catch (error) {}
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};
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