Add format-unicorn type definition.

format-unicorn/format-unicorn-safe-tests.ts

@@ -0,0 +1,11 @@
+/// <reference path="format-unicorn-safe.d.ts"/>
+
+import formatUnicorn from 'format-unicorn/safe';
+
+// Safe version
+var outputString: string;
+
+outputString = formatUnicorn('Hello, {name}; you have {favoriteNumber}', {
+  name: "kruncher",
+  favoriteNumber: 42
+});

format-unicorn/format-unicorn-safe.d.ts

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+// Type definitions for format-unicorn
+// Project: https://github.com/tallesl/format-unicorn
+// Definitions by: kruncher <https://github.com/kruncher/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module 'format-unicorn/safe' {
+
+  export default function (str: string, replacements: { }): string;
+
+}

format-unicorn/format-unicorn-tests.ts

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+/// <reference path="format-unicorn.d.ts"/>
+
+import 'format-unicorn';
+
+// Unsafe version
+var outputString: string;
+
+outputString = 'Hello, {name}; you have {favoriteNumber}'.formatUnicorn({
+  name: "kruncher",
+  favoriteNumber: 42
+});

format-unicorn/format-unicorn.d.ts

@@ -0,0 +1,12 @@
+// Type definitions for format-unicorn
+// Project: https://github.com/tallesl/format-unicorn
+// Definitions by: kruncher <https://github.com/kruncher/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+interface String {
+  formatUnicorn(replacements: { }): string;
+}
+
+declare module "format-unicorn" {
+
+}