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feat: auto theme for expressive code #721

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feat: auto theme for expressive code #721

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d6e2016
feat: auto theme for expressive code
JoeyC-Dev Jan 31, 2026
895703f
add missing line in themes configuration
JoeyC-Dev Feb 1, 2026
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3 changes: 2 additions & 1 deletion astro.config.mjs
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Original file line number Diff line number Diff line change
Expand Up @@ -56,7 +56,8 @@ export default defineConfig({
},
}),
expressiveCode({
themes: [expressiveCodeConfig.theme, expressiveCodeConfig.theme],
// themes: [expressiveCodeConfig.theme, expressiveCodeConfig.theme],
themes: expressiveCodeConfig.themes,
plugins: [
pluginCollapsibleSections(),
pluginLineNumbers(),
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3 changes: 2 additions & 1 deletion src/config.ts
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Expand Up @@ -86,5 +86,6 @@ export const licenseConfig: LicenseConfig = {
export const expressiveCodeConfig: ExpressiveCodeConfig = {
// Note: Some styles (such as background color) are being overridden, see the astro.config.mjs file.
// Please select a dark theme, as this blog theme currently only supports dark background color
theme: "github-dark",
// theme: "github-dark",
themes: ["github-dark", "github-dark-dimmed"],
};
3 changes: 2 additions & 1 deletion src/types/config.ts
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Expand Up @@ -98,5 +98,6 @@ export type BlogPostData = {
};

export type ExpressiveCodeConfig = {
theme: string;
// theme: string;
themes: string[];
};
15 changes: 10 additions & 5 deletions src/utils/setting-utils.ts
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Expand Up @@ -44,11 +44,16 @@ export function applyThemeToDocument(theme: LIGHT_DARK_MODE) {
break;
}

// Set the theme for Expressive Code
document.documentElement.setAttribute(
"data-theme",
expressiveCodeConfig.theme,
);
// Set the theme for Expressive Code (auto switch)
const themes = expressiveCodeConfig.themes || [];
const lightTheme = themes[0];
const darkTheme = themes.length > 1 ? themes[1] : themes[0];

const isDarkNow = document.documentElement.classList.contains("dark");
const autoTheme = isDarkNow ? darkTheme : lightTheme;
if (autoTheme) {
document.documentElement.setAttribute("data-theme", autoTheme);
}
}

export function setTheme(theme: LIGHT_DARK_MODE): void {
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