feat(mobx): add experiments store

src/mobx/State.ts

@@ -5,6 +5,7 @@ import { useContext } from "preact/hooks";
 
 import Auth from "./stores/Auth";
 import Draft from "./stores/Draft";
+import Experiments from "./stores/Experiments";
 import LocaleOptions from "./stores/LocaleOptions";
 
 interface StoreDefinition {
@@ -22,6 +23,7 @@ export default class State {
     auth: Auth;
     draft: Draft;
     locale: LocaleOptions;
+    experiments: Experiments;
 
     /**
      * Construct new State.
@@ -30,6 +32,7 @@ export default class State {
         this.auth = new Auth();
         this.draft = new Draft();
         this.locale = new LocaleOptions();
+        this.experiments = new Experiments();
 
         makeAutoObservable(this);
     }

src/mobx/stores/Experiments.ts

@@ -10,7 +10,7 @@ export type Experiment = "dummy" | "theme_shop";
 /**
  * Currently active experiments.
  */
-export const AVAILABLE_EXPERIMENTS: Experiment[] = ["theme_shop"];
+export const AVAILABLE_EXPERIMENTS: Experiment[] = ["dummy", "theme_shop"];
 
 /**
  * Definitions for experiments listed by {@link Experiment}.
@@ -84,6 +84,19 @@ export default class Experiments implements Persistent<Data> {
         this.enabled.delete(experiment);
     }
 
+    /**
+     * Set the state of an experiment.
+     * @param key Experiment
+     * @param enabled Whether this experiment is enabled.
+     */
+    @computed setEnabled(key: Experiment, enabled: boolean): void {
+        if (enabled) {
+            this.enable(key);
+        } else {
+            this.disable(key);
+        }
+    }
+
     /**
      * Reset and disable all experiments.
      */