Add tests and typings for array/any

Author: przemyslawzalewski

array/any.js

@@ -1 +1 @@
-export default xs => xs && xs.length > 0;
+export default xs => (xs ? xs.length > 0 : false);

array/any.test.ts

@@ -3,7 +3,16 @@
 import any from "./any.ts";
 
 describe("any", () => {
-  it("TODO", () => {
-    expect(any()).toBeDefined();
+  it("returns true if the array is not empty", () => {
+    expect(any([1, 2])).toBe(true);
+  });
+
+  it("returns false if the array is empty", () => {
+    expect(any([])).toBe(false);
+  });
+
+  it("returns false if the given argument is falsy", () => {
+    expect(any(null)).toBe(false);
+    expect(any(undefined)).toBe(false);
   });
 });

array/any.ts

@@ -1 +1 @@
-export default xs => xs && xs.length > 0;
+export default (xs: any[]): boolean => (xs ? xs.length > 0 : false);