Fix isiterable

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@pomle/shapes",
-  "version": "0.1.3",
+  "version": "0.1.4",
   "description": "TypeScript library for coalescing unknown data into well defined object shapes.",
   "author": "Pontus Alexander <pontus.alexander@gmail.com>",
   "license": "MIT",

src/__tests__/guards.test.ts

@@ -0,0 +1,37 @@
+import { isIterable } from "../guards";
+
+describe("Guards", () => {
+  describe("#record", () => {
+    it("returns true on array", () => {
+      expect(isIterable([])).toBe(true);
+    });
+
+    it("returns true on set", () => {
+      expect(isIterable(new Set())).toBe(true);
+    });
+
+    it("returns false on null", () => {
+      expect(isIterable(null)).toBe(false);
+    });
+
+    it("returns false on undefined", () => {
+      expect(isIterable(undefined)).toBe(false);
+    });
+
+    it("returns false on object", () => {
+      expect(isIterable({})).toBe(false);
+    });
+
+    it("returns false on string", () => {
+      expect(isIterable("")).toBe(false);
+    });
+
+    it("returns false on number", () => {
+      expect(isIterable(124)).toBe(false);
+    });
+
+    it("returns false on boolean", () => {
+      expect(isIterable(true)).toBe(false);
+    });
+  });
+});

src/guards.ts

@@ -1,3 +1,3 @@
 export function isIterable(value: any): value is Iterable<unknown> {
-  return typeof value === "object" && Symbol.iterator in value;
+  return value != null && typeof value === "object" && Symbol.iterator in value;
 }