diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..0d7e901
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,61 @@
+
+type EncoderDecoderInput = Object;
+
+interface ICodecOptions {
+  preset?: boolean;
+  safe?: boolean;
+  useraw?: boolean;
+  int64?: boolean;
+  uint8array?: boolean;
+  binarraybuffer?: boolean;
+  usemap?: boolean;
+}
+
+interface ICodec {
+  (options?: ICodecOptions);
+  options: ICodecOptions;
+  addExtPacker<T extends typeof FunctionConstructor = typeof FunctionConstructor>(type: number, instanceConstructor: T, instancePacker: (instance: InstanceType<T>) => Uint8Array);
+  addExtUnpacker<T = any>(type: number, instanceUnpacker: (buffer: Buffer) => T);
+}
+
+interface IEncoderDecoderOptions {
+  codec: ICodec;
+}
+
+interface IEncodeBuffer {
+  codec: ICodec;
+  write(input: EncoderDecoderInput);
+}
+
+interface IDecodeBuffer {
+  codec: ICodec;
+  fetch(): any;
+}
+
+class Encoder extends IEncodeBuffer {
+  constructor(options?: IEncoderDecoderOptions);
+  encode(chunk: any);
+  end(chunk: any);
+}
+
+class Decoder extends IDecodeBuffer {
+  constructor(options?: IEncoderDecoderOptions);
+  decode(chunk: any);
+  push(chunk: any);
+  end(chunk: any);
+}
+
+export function encode(input: EncoderDecoderInput, options?: IEncoderDecoderOptions): Uint8Array;
+
+export function decode(input: Buffer, options?: IEncoderDecoderOptions): any;
+export function decode(input: Uint8Array, options?: IEncoderDecoderOptions): any;
+export function decode(input: number[], options?: IEncoderDecoderOptions): any;
+
+export const Encoder: Encoder;
+export const Decoder: Decoder;
+
+export function createEncodeStream(): TransformStream;
+export function createDecodeStream(): TransformStream;
+
+export function createCodec(options?: ICodecOptions): ICodec;
+export const codec: ICodec;