Add TypeScript definitions

index.d.ts

@@ -0,0 +1,36 @@
+/**
+ * The LAB color configuration object.
+ */
+export interface Lab {
+  /** The lightness value, on scale of 0 to 100. */
+  L: number;
+  /** The chroma value, on scale of -128 to 128 */
+  A: number;
+  /** The hue value, on scale of -128 to 128 */
+  B: number;
+}
+
+declare class DeltaE {
+  /**
+   * The CIE76 color difference algorithm: a simple euclidean distance calculation.
+   * http://en.wikipedia.org/wiki/Color_difference#CIE76
+   */
+  getDeltaE76(x1: Lab, x2: Lab): number;
+
+  /**
+   * The CIE94 algorithm: an iteration of the CIE76 algorithm.
+   * http://en.wikipedia.org/wiki/Color_difference#CIE94
+   */
+  getDeltaE94(x1: Lab, x2: Lab): number;
+
+  /**
+   * The CIE2000 color difference algorithm.
+   * http://en.wikipedia.org/wiki/Color_difference#CIEDE2000
+   */
+
+  getDeltaE00(x1: Lab, x2: Lab): number;
+}
+
+declare const deltaE: DeltaE;
+
+export default deltaE;

package.json

@@ -4,6 +4,7 @@
   "description": "CIE color difference algorithms in JavaScript.",
   "private": false,
   "main": "./src/index.js",
+  "types": "./index.d.ts",
   "keywords": [
     "cie",
     "cie94",