feat(typescript-types): Add Assign<Shape,Defaults,Obj>

packages/typescript-types/test/assign.tst.ts

@@ -0,0 +1,29 @@
+import type { Assign } from '@/assign.js'
+import { expect } from 'tstyche'
+
+interface Person {
+	name: string
+	age?: number
+}
+
+interface Options extends Person {
+	relations?: Array<Person>
+}
+
+interface DefaultValues {
+	name: 'Max Mustermann'
+	age: 17
+	relations: []
+}
+
+expect<Assign<Options, DefaultValues, { name: 'Another Name' }>>().type.toBe<{
+	name: 'Another Name'
+	age?: 17
+	relations?: []
+}>()
+
+expect<Assign<Options, DefaultValues, { name: 'Another Name'; age: 18 }>>().type.toBe<{
+	name: 'Another Name'
+	age?: 18
+	relations?: []
+}>()