Branded types now compatible with declaration option of TS (#196)

runtypes · Mar 22, 2021 · 146d8f6 · 146d8f6
1 parent b0c25df
commit 146d8f6
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Showing 2 changed files with 7 additions and 3 deletions.
diff --git a/src/index.ts b/src/index.ts
@@ -24,5 +24,5 @@ export * from './types/function';
 export { InstanceOf } from './types/instanceof';
 export * from './types/lazy';
 export * from './types/constraint';
-export { Brand } from './types/brand';
+export * from './types/brand';
 export * from './decorator';
diff --git a/src/types/brand.ts b/src/types/brand.ts
@@ -1,12 +1,16 @@
 import { Runtype, Static, create } from '../runtype';
 
-declare const RuntypeName: unique symbol;
+export declare const RuntypeName: unique symbol;
+
+export interface RuntypeBrand<B extends string> {
+  [RuntypeName]: B;
+}
 
 export interface Brand<B extends string, A extends Runtype>
   extends Runtype<
     // TODO: replace it by nominal type when it has been released
     // https://github.com/microsoft/TypeScript/pull/33038
-    Static<A> & { [RuntypeName]: B }
+    Static<A> & RuntypeBrand<B>
   > {
   tag: 'brand';
   brand: B;