uptime-kuma/src/mixins/theme.js

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export default {
data() {
return {
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system: (window.matchMedia("(prefers-color-scheme: dark)").matches) ? "dark" : "light",
userTheme: localStorage.theme,
};
},
mounted() {
// Default Light
if (! this.userTheme) {
this.userTheme = "light";
}
document.body.classList.add(this.theme);
},
computed: {
theme() {
if (this.userTheme === "auto") {
return this.system;
}
return this.userTheme;
}
},
watch: {
userTheme(to, from) {
localStorage.theme = to;
},
theme(to, from) {
document.body.classList.remove(from);
document.body.classList.add(this.theme);
}
}
}