apps/web-shared/src/assets/preload.js


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const value = `; ${document.cookie}`;
const parts = value.split(`; go_theme=`);
let currentTheme = "system";
if (parts.length === 2) {
    currentTheme = parts.pop().split(";").shift();
}
if (currentTheme === "light") {
    document.querySelector("html").dataset.theme = "light";
} else if (currentTheme === "dark") {
    document.querySelector("html").dataset.theme = "dark";
} else {
    document.querySelector("html").dataset.theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
}