diff --git a/.gitignore b/.gitignore
index 8452bb5..5bfa031 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 npm-debug.log
 node_modules
 build
+browser/types
 index.html
 index.js
 yarn.lock
diff --git a/package.json b/package.json
index 0d76419..b0bbf28 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "version": "3.1.0",
   "description": "A library providing an API for generating MIDI files.",
   "main": "build/index.js",
-  "types": "types.d.ts",
+  "types": "build/types/main.d.ts",
   "dependencies": {
     "@tonaljs/midi": "^4.9.0"
   },
diff --git a/tsconfig.json b/tsconfig.json
index 0b4cec9..ba14d0c 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,5 +1,7 @@
 {
     "compilerOptions": {
-        "lib": ["esnext", "dom"]
+        "lib": ["esnext", "dom"],
+        "declaration": true,
+        "declarationDir": "./types"
     }
 }
diff --git a/types.d.ts b/types.d.ts
deleted file mode 100644
index 90ad4d4..0000000
--- a/types.d.ts
+++ /dev/null
@@ -1,113 +0,0 @@
-declare module "midi-writer-js" {
-	type BaseDuration = "1" | "2" | "4" | "8" | "16" | "32" | "64";
-	type TickDuration = `T${number}`;
-	type DottedDuration = `d${BaseDuration}`;
-	type DoubleDottedDuration = `dd${BaseDuration}`;
-	type TripletDuration = `${BaseDuration}t`;
-	type Duration =
-		| BaseDuration
-		| TickDuration
-		| DottedDuration
-		| DoubleDottedDuration
-		| TripletDuration;
-	type PitchModifier = "#" | "b" | "";
-	type BasePitch = "A" | "B" | "C" | "D" | "E" | "F" | "G";
-	type Pitch = `${BasePitch}${PitchModifier}${number}`;
-
-	type Options = Omit<NoteEvent, "wait" | "startTick"> &
-		(Pick<NoteEvent, "startTick"> | Pick<NoteEvent, "wait">);
-
-	class Event {}
-	class NoteEvent extends Event {
-		/**
-		 * Each pitch can be a string or valid MIDI note code. Format for string
-		 * is C#4. Pro tip: You can use the output from tonal functions to build
-		 * scales, chords, intervals, etc. in this parameter.
-		 */
-		pitch: Pitch | Pitch[];
-		/**
-		 * How long the note should sound.
-		 * - 1 : whole
-		 * - 2 : half
-		 * - d2 : dotted half
-		 * - dd2 : double dotted half
-		 * - 4 : quarter
-		 * - 4t : quarter triplet
-		 * - d4 : dotted quarter
-		 * - dd4 : double dotted quarter
-		 * - 8 : eighth
-		 * - 8t : eighth triplet
-		 * - d8 : dotted eighth
-		 * - dd8 : double dotted eighth
-		 * - 16 : sixteenth
-		 * - 16t : sixteenth triplet
-		 * - 32 : thirty-second
-		 * - 64 : sixty-fourth
-		 * - Tn : where n is an explicit number of ticks (T128 = 1 beat)
-		 *
-		 * If an array of durations is passed then the sum of the durations will be used.
-		 */
-		duration: Duration | Duration[];
-		/**
-		 * Grace note to be applied to note event. Takes same value format as pitch
-		 */
-		grace?: Pitch | Pitch[];
-		/**
-		 * If true then array of pitches will be played sequentially as opposed to simulatanously.
-		 * Default: false
-		 */
-		sequential?: boolean;
-		/**
-		 * How loud the note should sound, values 1-100. Default: 50
-		 */
-		velocity?: number;
-		/**
-		 * How many times this event should be repeated. Default: 1
-		 */
-		repeat?: number;
-		/**
-		 * MIDI channel to use. Default: 1
-		 */
-		channel?: number;
-		/**
-		 * How long to wait before sounding note (rest). Takes same values as duration.
-		 */
-		wait?: Duration | Duration[];
-		/**
-		 * Specific tick where this event should be played. If this parameter is supplied
-		 * then wait is disregarded if also supplied.
-		 */
-		startTick?: number;
-
-		constructor(options: Options);
-	}
-	class ProgramChangeEvent {
-		constructor(options?: Partial<{ instrument: number }>);
-	}
-	class Track {
-		addEvent<EventType extends Event>(
-			event: EventType | EventType[],
-			mapFunction?: (index: number, event: EventType) => Partial<EventType>
-		): void;
-		setTempo(tempo: number, tick: number): void;
-		addText(text: string): void;
-		addCopyright(text: string): void;
-		addTrackName(text: string): void;
-		addInstrumentName(text: string): void;
-		addMarker(text: string): void;
-		addCuePoint(text: string): void;
-		addLyric(text: string): void;
-		setTimeSignature(numerator: number, denominator: number): void;
-	}
-	class Writer {
-		constructor(track: Track | Track[]);
-		buildFile(): Uint8Array;
-		base64(): string;
-		dataUri(): string;
-		saveMIDI(filename: string): void;
-		/**
-		 *  file stream (cli)
-		 */
-		stdout(): void;
-	}
-}