Add types for exported module

index.d.ts

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+export * from "./src/nes";
+export * from "./src/controller";

src/controller.d.ts

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+export type ControllerKey = 1 | 2;
+
+export type ButtonKey = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7;
+
+export class Controller {
+  state: number[];
+  buttonDown: (key: ControllerKey) => void;
+  buttonUp: (key: ControllerKey) => void;
+
+  static readonly BUTTON_A = 0;
+  static readonly BUTTON_B = 1;
+  static readonly BUTTON_SELECT = 2;
+  static readonly BUTTON_START = 3;
+  static readonly BUTTON_UP = 4;
+  static readonly BUTTON_DOWN = 5;
+  static readonly BUTTON_LEFT = 6;
+  static readonly BUTTON_RIGHT = 7;
+}

src/nes.d.ts

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+import { ControllerKey, ButtonKey } from "./controller";
+
+export interface EmulatorData {
+  cpu: string;
+  mmap: string;
+  ppu: string;
+  papu: string;
+}
+
+export interface NESOptions {
+  onFrame?: (buffer: Buffer) => void;
+  onAudioSample?: (left: number, right: number) => void;
+  onStatusUpdate?: (status: string) => void;
+  onBatteryRamWrite?: (address: number, value: number) => void;
+  preferredFrameRate?: number;
+  emulateSound?: boolean;
+  sampleRate?: number;
+}
+
+export class NES {
+  constructor(opts: NESOptions);
+  stop: () => void;
+  reset: () => void;
+  frame: () => void;
+  buttonDown: (controller: ControllerKey, button: ButtonKey) => void;
+  buttonUp: (controller: ControllerKey, button: ButtonKey) => void;
+  zapperMove: (x: number, y: number) => void;
+  zapperFireDown: () => void;
+  zapperFireUp: () => void;
+  getFPS: () => number;
+  reloadROM: () => void;
+  loadROM: (data: string | Buffer) => void;
+  setFramerate: (rate: number) => void;
+  toJSON: () => EmulatorData;
+  fromJSON: (data: EmulatorData) => void;
+}