Total refactoring performed

src/types.ts

@@ -0,0 +1,16 @@
+export interface Instrument {
+  name: string;
+  sampleUrl?: string;
+}
+
+export type Grid = boolean[][];
+
+export type BassLineGrid = string[][];
+
+export interface BeatData {
+  tempo: number;
+  steps: number;
+  grid: Grid;
+  mutes?: boolean[];
+  bassLine?: BassLineGrid;
+}