diff --git a/geopattern/geopattern-tests.ts b/geopattern/geopattern-tests.ts
new file mode 100644
index 0000000000..79def7a91e
--- /dev/null
+++ b/geopattern/geopattern-tests.ts
@@ -0,0 +1,4 @@
+/// <reference path="index.d.ts" />
+
+var pattern = GeoPattern.generate('GitHub');
+pattern.toDataUrl();
diff --git a/geopattern/index.d.ts b/geopattern/index.d.ts
new file mode 100644
index 0000000000..77584571c9
--- /dev/null
+++ b/geopattern/index.d.ts
@@ -0,0 +1,70 @@
+// Type definitions for GeoPattern v1.2.3
+// Project: https://github.com/btmills/geopattern
+// Definitions by: Gaelan <https://github.com/Gaelan>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export as namespace GeoPattern;
+
+/**
+ * Returns a newly-generated, tiling SVG Pattern.
+ *
+ * @param string Will be hashed using the SHA1 algorithm, and the resulting hash
+ * will be used as the seed for generation.
+ */
+export function generate(string: string, options?: PatternOptions): Pattern;
+
+export interface PatternOptions {
+    /**
+     * Specify an exact background color. This is a CSS hexadecimal color
+     * value.
+     */
+    color: string;
+
+    /**
+     * Controls the relative background color of the generated image. The color
+     * is not identical to that used in the pattern because the hue is rotated
+     * by the generator. This is a CSS hexadecimal color value, which defaults
+     * to #933c3c.
+     */
+    baseColor: string;
+
+    /**
+     * Determines the pattern. All of the original patterns from the Ruby
+     * version at jasonlong/geo_pattern are available in this port, and their
+     * names are camelCased.
+     */
+    generator: GeneratorType;
+}
+
+export type GeneratorType = 'chevrons' | 'octagons' | 'overlappingCircles' |
+    'plusSigns' | 'xes' | 'sineWaves' | 'hexagons' | 'overlappingRings' |
+    'plaid' |'triangles' | 'squares' | 'nestedSquares' | 'mosaicSquares' |
+    'concentricCircles' | 'diamonds' | 'tessellation';
+
+export interface Pattern {
+    /** Gets the pattern's background color as a hexadecimal string. */
+    color: string;
+
+    /** Gets the SVG string representing the pattern. */
+    toString(): string;
+
+    /** Gets the SVG string representing the pattern. */
+    toSvg(): string;
+
+    /** Gets the SVG as a Base64-encoded string. */
+    toBase64(): string;
+
+    /**
+     * Gets the pattern as a data URI,
+     * i.e. data:image/svg+xml;base64,PHN2ZyB...
+     */
+    toDataUri(): string;
+
+    /**
+     * Gets the pattern as a data URL suitable for use as a CSS
+     * background-image, i.e. url("data:image/svg+xml;base64,PHN2ZyB...").
+     */
+    toDataUrl(): string;
+}
+
+// TODO: implement the jQuery plugin.
diff --git a/geopattern/tsconfig.json b/geopattern/tsconfig.json
new file mode 100644
index 0000000000..4dd9479920
--- /dev/null
+++ b/geopattern/tsconfig.json
@@ -0,0 +1,20 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es6",
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "geopattern-tests.ts"
+    ]
+}
diff --git a/geopattern/tslint.json b/geopattern/tslint.json
new file mode 100644
index 0000000000..377cc837d4
--- /dev/null
+++ b/geopattern/tslint.json
@@ -0,0 +1 @@
+{ "extends": "../tslint.json" }