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{/* Inlined to avoid FOUC. This is a parser blocking script. */}
<script is:inline>
const lightModePref = window.matchMedia("(prefers-color-scheme: light)");
function getUserPref() {
const storedTheme = typeof localStorage !== "undefined" && localStorage.getItem("theme");
return storedTheme || (lightModePref.matches ? "light" : "dark");
}
function setTheme(newTheme) {
if (newTheme !== "light" && newTheme !== "dark") {
return console.warn(
`Invalid theme value '${newTheme}' received. Expected 'light' or 'dark'.`,
);
}
const root = document.documentElement;
// root already set to newTheme, exit early
if (newTheme === root.getAttribute("data-theme")) {
return;
}
root.setAttribute("data-theme", newTheme);
if (typeof localStorage !== "undefined") {
localStorage.setItem("theme", newTheme);
}
}
// initial setup
setTheme(getUserPref());
// View Transitions hook to restore theme
document.addEventListener("astro:after-swap", () => setTheme(getUserPref()));
// listen for theme-change custom event, fired in src/components/ThemeToggle.astro
document.addEventListener("theme-change", (e) => {
setTheme(e.detail.theme);
});
// listen for prefers-color-scheme change.
lightModePref.addEventListener("change", (e) => setTheme(e.matches ? "light" : "dark"));
</script>
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