diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 088a423eb7..af326634b1 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -326,6 +326,7 @@ All definitions files include a header with the author and editors, so at some p
 * [Tags Manager](http://welldonethings.com/tags/manager) (by [Vincent Bortone](https://github.com/vbortone))
 * [Teechart](http://www.steema.com) (by [Steema](http://www.steema.com))
 * [text-buffer](https://github.com/atom/text-buffer) (by [vvakame](https://github.com/vvakame))
+* [text-encoding](https://github.com/inexorabletash/text-encoding) (by [MIZUNE Pine](https://github.com/pine613))
 * [three.js](http://mrdoob.github.com/three.js/) (by [Kon](http://phyzkit.net/))
 * [TimelineJS](https://github.com/NUKnightLab/TimelineJS) (by [Roland Zwaga](https://github.com/rolandzwaga))
 * [timezonecomplete](https://github.com/SpiritIT/timezonecomplete) (by [Rogier Schouten](https://github.com/rogierschouten))
diff --git a/text-encoding/text-encoding-tests.ts b/text-encoding/text-encoding-tests.ts
new file mode 100644
index 0000000000..e0274a04c0
--- /dev/null
+++ b/text-encoding/text-encoding-tests.ts
@@ -0,0 +1,60 @@
+/// <reference path="text-encoding.d.ts" />
+
+function test_encoder() {
+    var text = "plain text";
+    var uint8array: Uint8Array;
+
+    // constructor
+    uint8array = new TextEncoder().encode(text);
+    uint8array = new TextEncoder('utf-8').encode(text);
+    uint8array = new TextEncoder('windows-1252', { NONSTANDARD_allowLegacyEncoding: true }).encode(text);
+
+    uint8array = TextEncoder().encode(text);
+    uint8array = TextEncoder('utf-8').encode(text);
+    uint8array = TextEncoder('windows-1252', { NONSTANDARD_allowLegacyEncoding: true }).encode(text);
+
+    // attributes
+    var encoder = new TextEncoder();
+    encoder.encoding = 'utf-8';
+    var encoding: string = encoder.encoding;
+
+    // methods
+    encoder.encode();
+    encoder.encode(text);
+    encoder.encode(text, { stream: true });
+}
+
+function test_decoder() {
+    var text = "plain text";
+    var uint8array: Uint8Array = TextEncoder().encode(text);
+
+    // constructor
+    text = new TextDecoder().decode(uint8array);
+    text = new TextDecoder('utf-8').decode(uint8array);
+    text = new TextDecoder('windows-1252', {}).decode(uint8array);
+    text = new TextDecoder('windows-1252', { fatal: true }).decode(uint8array);
+    text = new TextDecoder('windows-1252', { ignoreBOM: true }).decode(uint8array);
+
+    text = TextDecoder().decode(uint8array);
+    text = TextDecoder('utf-8').decode(uint8array);
+    text = TextDecoder('windows-1252', {}).decode(uint8array);
+    text = TextDecoder('windows-1252', { fatal: true }).decode(uint8array);
+    text = TextDecoder('windows-1252', { ignoreBOM: true }).decode(uint8array);
+
+    // attributes
+    var decoder = new TextDecoder();
+
+    decoder.encoding = 'utf-8';
+    var encoding: string = decoder.encoding;
+
+    decoder.fatal = true;
+    var fatal: boolean = decoder.fatal;
+
+    decoder.ignoreBOM = true;
+    var ignoreBOM: boolean = decoder.ignoreBOM;
+
+    // methods
+    decoder.decode();
+    decoder.decode(uint8array);
+    decoder.decode(uint8array, { stream: true });
+}
\ No newline at end of file
diff --git a/text-encoding/text-encoding.d.ts b/text-encoding/text-encoding.d.ts
new file mode 100644
index 0000000000..574b25d716
--- /dev/null
+++ b/text-encoding/text-encoding.d.ts
@@ -0,0 +1,45 @@
+// Type definitions for text-encoding
+// Project: https://github.com/inexorabletash/text-encoding
+// Definitions by: MIZUNE Pine <https://github.com/pine613/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module TextEncoding {
+    interface TextDecoderOptions {
+        fatal?: boolean;
+        ignoreBOM?: boolean;
+    }
+
+    interface TextDecodeOptions {
+        stream?: boolean;
+    }
+
+    interface TextEncoderOptions {
+        NONSTANDARD_allowLegacyEncoding?: boolean;
+    }
+
+    interface TextDecoder {
+        encoding: string;
+        fatal: boolean;
+        ignoreBOM: boolean;
+        decode(input?: ArrayBufferView, options?: TextDecodeOptions): string;
+    }
+
+    interface TextEncoder {
+        encoding: string;
+        encode(input?: string, options?: TextEncodeOptions): Uint8Array;
+    }
+
+    interface TextEncodeOptions {
+        stream?: boolean;
+    }
+}
+
+declare var TextDecoder: {
+    (label?: string, options?: TextEncoding.TextDecoderOptions): TextEncoding.TextDecoder;
+    new (label?: string, options?: TextEncoding.TextDecoderOptions): TextEncoding.TextDecoder;
+};
+
+declare var TextEncoder: {
+    (utfLabel?: string, options?: TextEncoding.TextEncoderOptions): TextEncoding.TextEncoder;
+    new (utfLabel?: string, options?: TextEncoding.TextEncoderOptions): TextEncoding.TextEncoder;
+};
\ No newline at end of file