Add definitions for color-diff (#32516)

types/color-diff/color-diff-tests.ts

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+import diff from "color-diff";
+
+const color = { R: 255, G: 1, B: 30 };
+// red, green, blue
+const palette = [
+  { R: 255, G: 0, B: 0 },
+  { R: 0, G: 255, B: 0 },
+  { R: 0, G: 0, B: 255 }
+];
+
+diff.closest(color, palette); // {R: 255, G: 0, B: 0 }, red
+
+const color1 = { R: 255, G: 255, B: 255 };
+// black, white
+const palette1 = [{ R: 0, G: 0, B: 0 }, { R: 255, G: 255, B: 255 }];
+
+diff.furthest(color1, palette1); // {R: 0, G: 0, B: 0 }, black

types/color-diff/index.d.ts

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+// Type definitions for color-diff 1.1
+// Project: https://github.com/markusn/color-diff#readme
+// Definitions by: katsanva <https://github.com/katsanva>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.7
+
+export interface RGBColor {
+  R: number;
+  G: number;
+  B: number;
+  A?: number;
+}
+
+export interface LabColor {
+  L: number;
+  a: number;
+  b: number;
+}
+
+export function diff(c1: LabColor, c2: LabColor): number;
+
+export function rgb_to_lab(c: RGBColor): LabColor;
+export function rgba_to_lab(c: RGBColor, bc?: RGBColor): LabColor;
+
+export function closest(
+  color: RGBColor,
+  palette: ReadonlyArray<RGBColor>,
+  backgroundColor?: RGBColor
+): RGBColor;
+
+export function furthest(
+  color: RGBColor,
+  palette: ReadonlyArray<RGBColor>,
+  backgroundColor?: RGBColor
+): RGBColor;
+
+export function map_palette(
+  a: ReadonlyArray<RGBColor>,
+  b: ReadonlyArray<RGBColor>,
+  type?: "closest" | "furthest",
+  backgroundColor?: RGBColor
+): { [key: string]: RGBColor };
+
+export function palette_map_key(c: RGBColor): string;
+
+export function closest_lab(
+  color: LabColor,
+  palette: ReadonlyArray<LabColor>
+): LabColor;
+
+export function furthest_lab(
+  color: LabColor,
+  palette: ReadonlyArray<LabColor>
+): LabColor;
+
+export function map_palette_lab(
+  p1: ReadonlyArray<LabColor>,
+  p2: ReadonlyArray<LabColor>
+): { [key: string]: LabColor };
+
+export function lab_palette_map_key(c: LabColor): string;
+
+export function match_palette_lab(
+  target_color: LabColor,
+  palette: ReadonlyArray<LabColor>,
+  find_furthest: boolean
+): LabColor;

types/color-diff/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": ["es6"],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": ["../"],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "esModuleInterop": true,
+        "strictFunctionTypes": true
+    },
+    "files": ["index.d.ts", "color-diff-tests.ts"]
+}

types/color-diff/tslint.json

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+{ "extends": "dtslint/dt.json" }