update?

src/Store.ts

@@ -0,0 +1,20 @@
+import type BeatUnit from "./BeatUnit";
+import Beat, {BeatInitOptions} from "./Beat";
+
+export default class Store {
+    private beat: Beat;
+    constructor(options: BeatInitOptions) {
+        this.beat = new Beat(options);
+    }
+
+    getBeat() {
+        return this.beat;
+    }
+
+    subscribeBeatUnit(schemaKey: string, index: number, callback: (unit: BeatUnit) => void): BeatUnit {
+        this.beat.onUnitUpdate(() => {
+            callback(this.beat.getUnit(schemaKey, index));
+        });
+        return this.beat.getUnit(schemaKey, index);
+    }
+}