diff --git a/isbn-utils/index.d.ts b/isbn-utils/index.d.ts
new file mode 100644
index 0000000000..fe2ac4dae9
--- /dev/null
+++ b/isbn-utils/index.d.ts
@@ -0,0 +1,35 @@
+// Type definitions for isbn-utils 1.1
+// Project: https://github.com/GitbookIO/isbn-utils
+// Definitions by: Jørgen Elgaard Larsen <https://github.com/elhaard/>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+
+type IGroups = any;
+
+export class ISBNcodes {
+    readonly source: string;
+    readonly prefix: string;
+    readonly group: string;
+    readonly publisher: string;
+    readonly article: string;
+    readonly check: string;
+    readonly check10: string;
+    readonly check13: string;
+    readonly groupname: string;
+}
+
+export class ISBN {
+    constructor(val: string, groups: IGroups);
+    asIsbn10(hyphenate?: boolean): string;
+    asIsbn13(hyphenate?: boolean): string;
+    codes: ISBNcodes;
+    isIsbn10(): boolean;
+    isIsbn13(): boolean;
+    isValid(): boolean;
+}
+
+export function asIsbn10(isbn: string, hyphenate?: boolean): string;
+export function asIsbn13(isbn: string, hyphenate?: boolean): string;
+export function parse(isbn: string, groups?: IGroups): ISBN|null;
+export function hyphenate(isbn: string): string;
+export function isValid(isbn: string, groups?: IGroups): boolean;
diff --git a/isbn-utils/isbn-utils-tests.ts b/isbn-utils/isbn-utils-tests.ts
new file mode 100644
index 0000000000..91f72a0359
--- /dev/null
+++ b/isbn-utils/isbn-utils-tests.ts
@@ -0,0 +1,36 @@
+import * as isbn from 'isbn-utils';
+
+
+const isbn10a: isbn.ISBN|null = isbn.parse('4873113369');
+let b: boolean;
+let s: string;
+
+if (isbn10a !== null) {
+    b = isbn10a.isIsbn10();
+    b = isbn10a.isIsbn13();
+    s = isbn10a.asIsbn10();
+    s = isbn10a.asIsbn10(true);
+    s = isbn10a.asIsbn13();
+    s = isbn10a.asIsbn13(true);
+    s = isbn10a.codes.source;
+    s = isbn10a.codes.prefix;
+    s = isbn10a.codes.group;
+    s = isbn10a.codes.publisher;
+    s = isbn10a.codes.article;
+    s = isbn10a.codes.check;
+    s = isbn10a.codes.check10;
+    s = isbn10a.codes.check13;
+    s = isbn10a.codes.groupname;
+}
+
+const bad: isbn.ISBN|null = isbn.parse('invalid format');
+if (bad === null) {
+  s = 'Bummer.';
+}
+
+s = isbn.asIsbn13('4-87311-336-9');
+s = isbn.asIsbn13('4-87311-336-9', true);
+s = isbn.asIsbn10('978-4-87311-336-4');
+s = isbn.asIsbn10('978-4-87311-336-4', true);
+
+s = isbn.hyphenate('9784873113364');
diff --git a/isbn-utils/tsconfig.json b/isbn-utils/tsconfig.json
new file mode 100644
index 0000000000..b061bf6192
--- /dev/null
+++ b/isbn-utils/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "files": [
+        "index.d.ts",
+        "isbn-utils-tests.ts"
+    ],
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es6",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    }
+}
diff --git a/isbn-utils/tslint.json b/isbn-utils/tslint.json
new file mode 100644
index 0000000000..f9e30021f4
--- /dev/null
+++ b/isbn-utils/tslint.json
@@ -0,0 +1,3 @@
+{
+    "extends": "../tslint.json"
+}