diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..2ff2a77
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,98 @@
+/// <reference types="node" />
+
+declare namespace Sox {
+    export type Combine =
+        "concatenate" |
+        "sequence" |
+        "mix" |
+        "mix-power" |
+        "merge" |
+        "multiply";
+
+    export type Encoding =
+        "signed-integer" |
+        "unsigned-integer" |
+        "floating-point" |
+        "mu-law" |
+        "a-law" |
+        "ima-adpcm" |
+        "ms-adpcm" |
+        "gsm-full-rate";
+
+    export type Endian =
+        "little" |
+        "big" |
+        "swap";
+
+    export type Effect = string | string[];
+
+    export interface StreamOptions {
+        "type"?: string;
+        "bits"?: number;
+        "encoding"?: Encoding;
+        "reverse-nibbles"?: boolean;
+        "reverse-bits"?: boolean;
+        "endian"?: Endian;
+        "channels"?: number;
+        "no-glob"?: boolean;
+        "rate"?: number;
+        "b"?: number;
+        "e"?: Encoding;
+        "t"?: string;
+        "N"?: boolean;
+        "X"?: boolean;
+        "L"?: boolean;
+        "B"?: boolean;
+        "x"?: boolean;
+        "c"?: number;
+        "r"?: number;
+    }
+
+    export interface InputOptions extends StreamOptions {
+        "ignore-length"?: boolean;
+        "volume"?: number;
+        "v"?: number;
+    }
+
+    export interface OutputOptions extends StreamOptions  {
+        "comment"?: string;
+        "add-comment"?: string;
+        "comment-file"?: string;
+        "compression"?: number;
+        "C"?: number;
+    }
+
+    export interface GlobalOptions {
+        "buffer"?: number;
+        "combine"?: Combine;
+        "mix"?: boolean;
+        "no-dither"?: boolean;
+        "effects-file"?: string;
+        "guard"?: boolean;
+        "input-buffer"?: number;
+        "norm"?: boolean;
+        "play-rate-arg"?: string;
+        "plot"?: "gnuplot" | "octave";
+        "replay-gain": "track" | "album" | "off";
+        "single-threaded"?: boolean;
+        "temp"?: string;
+        "R"?: boolean;
+        "M"?: boolean;
+        "T"?: boolean;
+        "D"?: boolean;
+        "G"?: boolean;
+    }
+
+    export interface SoxOptions {
+        input?: InputOptions;
+        output: OutputOptions;
+        effects?: Effect[];
+        global?: GlobalOptions;
+        soxPath?: string;
+    }
+
+}
+
+declare function Sox(options: Sox.SoxOptions): NodeJS.ReadWriteStream;
+
+export = Sox;