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URL: http://github.com/nodejs/doc-kit/pull/766/files

ymous" media="all" rel="stylesheet" href="https://github.githubassets.com/assets/code-c22301b4e838281c.css" /> fix: resolve flash of unstyled content in dark mode by TusharThakur04 · Pull Request #766 · nodejs/doc-kit · GitHub
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fix: resolve flash of unstyled content in dark mode #766

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fix: resolve flash of unstyled content in dark mode #766

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2 changes: 1 addition & 1 deletion src/generators/web/template.html
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@
href="https://fonts.googleapis.com/css2?family=IBM+Plex+Mono&family=Open+Sans:ital,wght@0,300..800;1,300..800" />

<!-- Apply theme before paint to avoid Flash of Unstyled Content -->
<script>document.documentElement.setAttribute("data-theme", document.documentElement.style.colorScheme = localStorage.getItem("theme") || (matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light"));</script>
<script>${themeScript}</script>
<script type="importmap">${importMap}</script>
<script type="speculationrules">${speculationRules}</script>
</head>
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26 changes: 26 additions & 0 deletions src/generators/web/ui/theme-script.mjs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,26 @@
'use strict';

/**
* This script is designed to be inlined in the <head> of the HTML template.
* It must execute BEFORE the body renders to prevent a Flash of Unstyled Content (FOUC).
*/
function initializeTheme() {
var THEME_STORAGE_KEY = 'theme';
var THEME_DATA_ATTRIBUTE = 'data-theme';
var DARK_QUERY = '(prefers-color-scheme: dark)';

var savedUserPreference = localStorage.getItem(THEME_STORAGE_KEY);
var systemSupportsDarkMode = window.matchMedia(DARK_QUERY).matches;

var shouldApplyDark =
savedUserPreference === 'dark' ||
(savedUserPreference === 'system' && systemSupportsDarkMode) ||
(!savedUserPreference && systemSupportsDarkMode);

var themeToApply = shouldApplyDark ? 'dark' : 'light';

document.documentElement.setAttribute(THEME_DATA_ATTRIBUTE, themeToApply);
document.documentElement.style.colorScheme = themeToApply;
}

export var THEME_SCRIPT = `(${initializeTheme.toString()})();`;
2 changes: 2 additions & 0 deletions src/generators/web/utils/processing.mjs
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Expand Up @@ -13,6 +13,7 @@ import getConfig from '../../../utils/configuration/index.mjs';
import { populate } from '../../../utils/configuration/templates.mjs';
import { minifyHTML } from '../../../utils/html-minifier.mjs';
import { SPECULATION_RULES } from '../constants.mjs';
import { THEME_SCRIPT } from '../ui/theme-script.mjs';

/**
* Populates a template string by evaluating it as a JavaScript template literal,
Expand Down Expand Up @@ -137,6 +138,7 @@ export async function processJSXEntries(entries, template) {
importMap: clientBundle.importMap?.replaceAll('/', root) ?? '',
entrypoint: `${data.api}.js?${randomUUID()}`,
speculationRules: SPECULATION_RULES,
themeScript: THEME_SCRIPT,
root,
metadata: data,
config,
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