diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..cb05b8a
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,156 @@
+declare namespace aperture {
+  type Screen = {
+    id: number;
+    name: string;
+  };
+
+  type AudioDevice = {
+    id: string;
+    name: string;
+  };
+
+  type VideoCodec = 'h264' | 'hevc' | 'proRes422' | 'proRes4444';
+
+  type RecordingOptions = {
+    /**
+    Number of frames per seconds.
+    */
+    readonly fps?: number;
+
+    /**
+    Record only an area of the screen.
+    */
+    readonly cropArea?: {
+      x: number;
+      y: number;
+      width: number;
+      height: number;
+    };
+
+    /**
+    Show the cursor in the screen recording.
+    */
+    readonly showCursor?: boolean;
+
+    /**
+    Highlight cursor clicks in the screen recording.
+
+    Enabling this will also enable the `showCursor` option.
+    */
+    readonly highlightClicks?: boolean;
+
+    /**
+    Screen to record.
+
+    Defaults to primary screen.
+    */
+    readonly screenId?: number;
+
+    /**
+    Audio device to include in the screen recording.
+
+    Should be one of the `id`'s from `aperture.audioDevices()`.
+    */
+    readonly audioDeviceId?: string;
+
+    /**
+    Video codec to use.
+
+    The `hevc` codec requires macOS 10.13 or newer. A computer with Intel 6th generation processor or newer is strongly recommended, as otherwise it will use software encoding, which only produces 3 FPS fullscreen recording.
+
+    The `proRes422` and `proRes4444` codecs are uncompressed data. They will create huge files.
+    */
+    readonly videoCodec?: VideoCodec;
+  };
+
+  interface Recorder {
+    /**
+    Returns a `Promise` that fullfills when the recording starts or rejects if the recording didn't start after 5 seconds.
+    */
+    startRecording: (options?: RecordingOptions) => Promise<void>;
+
+    /**
+    `Promise` that fullfills with the path to the screen recording file when it's ready. This will never reject.
+
+    Only available while a recording is happening, `undefined` otherwise.
+
+    Usually, this resolves around 1 second before the recording starts, but that's not guaranteed.
+    */
+    isFileReady: Promise<string> | undefined;
+
+    /**
+    Pauses the recording. To resume, call `recorder.resume()`.
+
+    Returns a `Promise` that fullfills when the recording has been paused.
+    */
+    pause: () => Promise<void>;
+
+    /**
+    Resumes the recording if it's been paused.
+
+    Returns a `Promise` that fullfills when the recording has been resumed.
+    */
+    resume: () => Promise<void>;
+
+    /**
+    Returns a `Promise` that resolves with a boolean indicating whether or not the recording is currently paused.
+    */
+    isPaused: () => Promise<boolean>;
+
+    /**
+    Returns a `Promise` for the path to the screen recording file.
+    */
+    stopRecording: () => Promise<string>;
+  }
+}
+
+declare const aperture: (() => aperture.Recorder) & {
+  /**
+  Get a list of available video codecs.
+
+  The key is the `videoCodec` option name and the value is the codec name.
+
+  It only returns `hevc` if you're on macOS 10.13 or newer and your computer supports HEVC hardware encoding.
+
+  @example
+  ```
+  Map {
+    'h264' => 'H264',
+    'hevc' => 'HEVC',
+    'proRes422' => 'Apple ProRes 422',
+    'proRes4444' => 'Apple ProRes 4444'
+  }
+  ```
+  */
+  videoCodecs: Map<aperture.VideoCodec, string>;
+
+  /**
+  Get a list of screens.
+
+  The first screen is the primary screen.
+
+  @example
+  ```
+  [{
+    id: 69732482,
+    name: 'Color LCD'
+  }]
+  ```
+  */
+  screens: () => Promise<aperture.Screen[]>;
+
+  /**
+  Get a list of audio devices.
+
+  @example
+  ```
+  [{
+    id: 'AppleHDAEngineInput:1B,0,1,0:1',
+    name: 'Built-in Microphone'
+  }]
+  ```
+  */
+  audioDevices: () => Promise<aperture.AudioDevice[]>;
+};
+
+export = aperture;
diff --git a/index.test-d.ts b/index.test-d.ts
new file mode 100644
index 0000000..94fbb15
--- /dev/null
+++ b/index.test-d.ts
@@ -0,0 +1,20 @@
+import {expectType, expectError} from 'tsd';
+import {Recorder, Screen, AudioDevice, VideoCodec} from './index.js';
+
+import aperture = require('./index.js');
+
+const recorder = aperture();
+
+expectType<Recorder>(recorder);
+
+expectType<AudioDevice[]>(await aperture.audioDevices());
+
+expectType<Screen[]>(await aperture.screens());
+
+expectError(recorder.startRecording({videoCodec: 'random'}));
+
+expectType<string | undefined>(await recorder.isFileReady);
+
+expectType<string>(await recorder.stopRecording());
+
+expectType<Map<VideoCodec, string>>(aperture.videoCodecs);
diff --git a/package.json b/package.json
index f48a33f..37f9047 100644
--- a/package.json
+++ b/package.json
@@ -8,13 +8,14 @@
     "node": ">=10"
   },
   "scripts": {
-    "test": "xo && ava",
+    "test": "xo && ava && tsd",
     "build": "swift build --configuration=release && mv .build/release/aperture .",
     "prepublish": "npm run build"
   },
   "files": [
     "index.js",
-    "aperture"
+    "aperture",
+    "index.d.ts"
   ],
   "dependencies": {
     "electron-util": "^0.14.2",
@@ -28,6 +29,7 @@
     "delay": "^5.0.0",
     "file-type": "^12.0.0",
     "read-chunk": "^3.2.0",
+    "tsd": "^0.14.0",
     "xo": "^0.38.2"
   },
   "xo": {