feat: adding a very powerful type call AnyKey.ts

packages/easy/src/index.ts

@@ -54,6 +54,7 @@ export * from './sql/Table';
 export * from './sql/TableGateway';
 export * from './sql/Update';
 
+export * from './types/AnyKey';
 export * from './types/Array';
 export * from './types/Builder';
 export * from './types/Cache';

packages/easy/src/types/AnyKey.ts

@@ -0,0 +1,3 @@
+export type AnyKey<T> = {
+  [Key in keyof T & (string | number)]: T[Key] extends object ? `${Key}` | `${Key}.${AnyKey<T[Key]>}` : `${Key}`;
+}[keyof T & (string | number)];

packages/easy/test/types/AnyKey.test.ts

@@ -0,0 +1,24 @@
+import { AnyKey, traverse } from '../../src';
+
+class Test<T> {
+  constructor(public readonly value: T) {}
+
+  toValue = (key: AnyKey<T>) => traverse(this.value, key);
+}
+
+describe('AnyKey', () => {
+  const data = {
+    id: 42,
+    name: { first: 'Jan', last: 'Jansen', address: { city: 'Amsterdam', country: 'NL' } },
+    paid: { currency: 'EUR', cents: 3000 },
+  };
+
+  test('toValue', () => {
+    const t = new Test(data);
+    expect(t.toValue('id')).toBe(42);
+    expect(t.toValue('name.last')).toBe('Jansen');
+    expect(t.toValue('name.first')).toBe('Jan');
+    expect(t.toValue('paid.cents')).toBe(3000);
+    expect(t.toValue('name.address.city')).toBe('Amsterdam');
+  });
+});