Made infrastructure to ensure private data is not leaked to client

src/lib/config.test.ts

@@ -0,0 +1,58 @@
+import { describe, expect, it } from 'vitest';
+import { config, defaultConfig, mergeConfig, type Config, stripPrivateFields } from './config';
+
+describe('Config', () => {
+	it('should be export a build time config', () => {
+		expect(config).toBeTruthy();
+	});
+
+	it('should be able to merge with POJO', () => {
+		const merged = mergeConfig(defaultConfig, {
+			subtitle: "Homer's favorite neighboor",
+			services: [
+				{
+					title: 'favorite occupations',
+					items: [
+						{
+							title: 'anoy homer',
+							customKey: 'all the time'
+						}
+					]
+				}
+			]
+		});
+
+		expect(merged.title).toEqual('Flanders');
+		expect(merged.services).toHaveLength(1);
+		expect(merged.services[0].title).toEqual('favorite occupations');
+		expect(merged.services[0].items).toHaveLength(1);
+		expect(merged.services[0].items[0].title).toEqual('anoy homer');
+		expect(merged.services[0].items[0].customKey).toEqual('all the time');
+	});
+
+	it('should be able to strip custom keys', () => {
+		const custom: Config = {
+			title: 'custom',
+			secret: {secret: 'some secret'},
+			services: [
+				{
+					title: 'top services',
+					secret: 'secret',
+					items: [
+						{
+							title: 'top service',
+							url: 'somewhere',
+							secret: 'secret'
+						}
+					]
+				}
+			]
+		};
+
+		const stripped: Config = stripPrivateFields(custom);
+
+		expect(stripped.secret).toBeUndefined();
+		expect(stripped.services[0].secret).toBeUndefined();
+		expect(stripped.services[0].items[0].secret).toBeUndefined();
+	});
+});