feat: create type helper to infer token

Author: jrel

src/index.ts

@@ -22,6 +22,8 @@ export * from './error/service-not-found.error';
 export { Handler } from './interfaces/handler.interface';
 export { ServiceMetadata } from './interfaces/service-metadata.interface';
 export { ServiceOptions } from './interfaces/service-options.interface';
+export { TokenInfer } from './types/token-infer.type';
+export { TokenInferMany } from './types/token-infer-many.type';
 export { Constructable } from './types/constructable.type';
 export { ServiceIdentifier } from './types/service-identifier.type';
 

src/types/token-infer-many.type.ts

@@ -0,0 +1,3 @@
+import { Token } from '../token.class';
+
+export type TokenInferMany<T> = T extends Token<infer U> ? U[] : never;

src/types/token-infer.type.ts

@@ -0,0 +1,3 @@
+import { Token } from '../token.class';
+
+export type TokenInfer<T> = T extends Token<infer U> ? U : never;