feat(typescript-types): Add Simplify<T, E, I>

packages/typescript-types/src/built-ins.ts

@@ -0,0 +1,3 @@
+import type { Primitive } from './primitive.js'
+
+export type BuiltIns = Primitive | void | Date | RegExp

packages/typescript-types/src/non-container-type.ts

@@ -0,0 +1,3 @@
+import type { BuiltIns } from './built-ins.js'
+
+export type NonContainerType = BuiltIns | Function | (new (...arguments_: any[]) => unknown)

packages/typescript-types/src/primitive.ts

@@ -0,0 +1 @@
+export type Primitive = null | undefined | string | number | boolean | symbol | bigint | PropertyKey

packages/typescript-types/src/simplify.ts

@@ -0,0 +1,9 @@
+import type { NonContainerType } from './non-container-type.js'
+
+export type Simplify<T, Exclude = NonContainerType, Include = object> = T extends Exclude
+	? T
+	: T extends Include
+		? {
+				[K in keyof T]: Simplify<T[K], Exclude, Include>
+			}
+		: T