Update watcher function. Add tests

src/__tests__/utils/is-development.test.ts

@@ -0,0 +1,39 @@
+import { describe, it, expect, beforeEach, afterEach } from "bun:test";
+import isDevelopment from "../../utils/is-development";
+
+const originalEnv = process.env.NODE_ENV;
+
+beforeEach(() => {
+    // Reset global config before each test
+    (global as any).CONFIG = {};
+});
+
+afterEach(() => {
+    process.env.NODE_ENV = originalEnv;
+});
+
+describe("isDevelopment", () => {
+    it("returns false when NODE_ENV is production", () => {
+        process.env.NODE_ENV = "production";
+        (global as any).CONFIG = { development: true };
+        expect(isDevelopment()).toBe(false);
+    });
+
+    it("returns true when config.development is true and NODE_ENV is not production", () => {
+        process.env.NODE_ENV = "development";
+        (global as any).CONFIG = { development: true };
+        expect(isDevelopment()).toBe(true);
+    });
+
+    it("returns false when config.development is false", () => {
+        process.env.NODE_ENV = "development";
+        (global as any).CONFIG = { development: false };
+        expect(isDevelopment()).toBe(false);
+    });
+
+    it("returns false when config.development is undefined", () => {
+        process.env.NODE_ENV = "development";
+        (global as any).CONFIG = {};
+        expect(isDevelopment()).toBe(false);
+    });
+});