plane/apps/app/store/theme.ts

// mobx
import { action, observable, makeObservable } from "mobx";
// helper
import { applyTheme, unsetCustomCssVariables } from "helpers/theme.helper";
// interfaces
import { ICurrentUserSettings } from "types";

class ThemeStore {
  sidebarCollapsed: boolean | null = null;
  theme: string | null = null;
  // root store
  rootStore;

  constructor(_rootStore: any | null = null) {
    makeObservable(this, {
      // observable
      sidebarCollapsed: observable,
      theme: observable,
      // action
      setSidebarCollapsed: action,
      setTheme: action,
      // computed
    });

    this.rootStore = _rootStore;
    this.initialLoad();
  }

  setSidebarCollapsed(collapsed: boolean | null = null) {
    if (collapsed === null) {
      let _sidebarCollapsed: string | boolean | null =
        localStorage.getItem("app_sidebar_collapsed");
      _sidebarCollapsed = _sidebarCollapsed ? (_sidebarCollapsed === "true" ? true : false) : false;
      this.sidebarCollapsed = _sidebarCollapsed;
    } else {
      this.sidebarCollapsed = collapsed;
      localStorage.setItem("app_sidebar_collapsed", collapsed.toString());
    }
  }

  setTheme = async (_theme: { theme: ICurrentUserSettings }) => {
    try {
      const currentTheme: string = _theme.theme.theme.toString();

      // updating the local storage theme value
      localStorage.setItem("theme", currentTheme);
      // updating the mobx theme value
      this.theme = currentTheme;

      // applying the theme to platform if the selected theme is custom
      if (currentTheme === "custom") {
        const themeSettings = this.rootStore.user.currentUserSettings || null;
        applyTheme(
          themeSettings?.theme?.palette !== ",,,,"
            ? themeSettings?.theme?.palette
            : "#0d101b,#c5c5c5,#3f76ff,#0d101b,#c5c5c5",
          themeSettings?.theme?.darkPalette
        );
      } else unsetCustomCssVariables();
    } catch (error) {
      console.error("setting user theme error", error);
    }
  };

  // init load
  initialLoad() {}
}

export default ThemeStore;