Port to elysia, tailwind (no effect)

packages/common/src/Brand.ts

@@ -0,0 +1,35 @@
+import * as Function from "./Function";
+import * as Types from "./Types";
+
+declare const BrandTypeId: unique symbol;
+export type BrandTypeId = typeof BrandTypeId;
+
+declare const ConstructorTypeId: unique symbol;
+export type ConstructorTypeId = typeof ConstructorTypeId;
+
+export interface Brand<in out K extends string | symbol> {
+	readonly [BrandTypeId]: {
+		readonly [k in K]: K;
+	}
+}
+
+export declare namespace Brand {
+	export interface Constructor<in out A extends Brand<any>> {
+		readonly [ConstructorTypeId]: ConstructorTypeId;
+		(args: Brand.Unbranded<A>): A;
+	}
+
+	export type Unbranded<P> = P extends infer Q & Brands<P> ? Q : P;
+
+	export type Brands<P> = P extends Brand<any>
+		? Types.UnionToIntersection<{
+			[k in keyof P[BrandTypeId]]: k extends string | symbol ? Brand<k> : never
+		}[keyof P[BrandTypeId]]>
+		: never;
+}
+
+export type Branded<A, K extends string | symbol> = A & Brand<K>;
+
+export const nominal = <A extends Brand<any>>(): Brand.Constructor<A> => {
+	return Function.identity as Brand.Constructor<A>;
+};