Convert store to typescript w/ matching interfaces

src/modules/darkmodeModule.ts

@@ -0,0 +1,31 @@
+import IStateDarkmode from "../interfaces/IStateDarkmode";
+
+const state: IStateDarkmode = {
+  darkmodeSupported: false,
+  userChoice: undefined
+};
+
+export default {
+  namespaced: true,
+  state,
+  getters: {
+    darkmodeSupported: (state: IStateDarkmode) => {
+      return state.darkmodeSupported;
+    }
+  },
+  mutations: {
+    SET_DARKMODE_SUPPORT: (
+      state: IStateDarkmode,
+      browserSupported: boolean
+    ) => {
+      state.darkmodeSupported = browserSupported;
+    }
+  },
+  actions: {
+    findAndSetDarkmodeSupported({ commit }) {
+      const browserSupported =
+        window.matchMedia("(prefers-color-scheme)").media !== "not all";
+      commit("SET_DARKMODE_SUPPORT", browserSupported);
+    }
+  }
+};