@mr-hope/vuepress-shared/lib/esm/darkmode.js

Shared for vuepress-theme-hope

export const watchDarkTheme = (callback) => {
    const isDarkMode = window.matchMedia("(prefers-color-scheme: dark)").matches;
    const listener = (event) => callback(event.matches);
    window
        .matchMedia("(prefers-color-scheme: dark)")
        .addEventListener("change", listener);
    callback(isDarkMode);
    return () => {
        window
            .matchMedia("(prefers-color-scheme: dark)")
            .removeEventListener("change", listener);
    };
};
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