NestJS - is is possible to get the parameter's value within a nest ParamDecorator?

Question

I do have 2 decorators: @CurrentUser() and @MinimumRole(Role.manager)

• The @CurrentUser takes the user from the context and set it to the decorated parameter.
• The @MinimumRole(Role.manager) check if the user in the context has the minimum specified role, throw if this is not the case.

The code of the second decorator is as follow:

export const MinimumRole = createParamDecorator(
  (minimumRole: Role, executionContext: ExecutionContext) => {

    const user = getCurrentUserFromContext(executionContext);
    assertHasMinimumRole(user.role, minimumRole); // throw if the condition is not met
    return undefined;
  });

Now, I would like the @MinimumRole to work like a transparent decorator i.e. without changing the decorated value. Because right now if I do so:

@CurrentUser() @MinimumRole(Role.manager) user: User; it works (@CurrentUser is last to be called and therefore last to return the value)

while

@MinimumRole(Role.manager) @CurrentUser() user: User; will set undefined to the decorated value (as my decorator returns undefined) and therefore override the users value.

I do see 2 solutions but I need some help:

1. Either there is a way to get the target's value in the createParamDecorator, in which case I would be able to return this value.

2. Moving the decorator so that it decorates the whole method instead of a parameter's only. But I would then need to know how to get the context from a method decorator in nestjs.