Function validates

validates<
    TSchema extends ZodType<any, ZodTypeDef, any>,
    TInput = unknown,
    TOutput = TypeOf<TSchema>,
>(
    schema: TSchema,
    transformer?: (input: TypeOf<TSchema>) => TOutput,
): ContractValidator<TInput, TOutput>
Creates a validation condition that uses a Zod schema to validate and optionally transform input. This condition is marked as a validator for the @contract decorator, meaning it can modify the input.
Type Parameters
- TSchema extends ZodType<any, ZodTypeDef, any>
  The Zod schema type.
- TInput = unknown
  The expected type of the input before validation.
- TOutput = TypeOf<TSchema>
  The inferred type from the Zod schema, or the transformed type.
Parameters
- schema: TSchema
  The Zod schema to validate the input against.
- Optionaltransformer: (input: TypeOf<TSchema>) => TOutput
  An optional function to transform the validated input.
Returns ContractValidator<TInput, TOutput>
A validator function that takes input and returns the validated/transformed input.
Throws
If the input validation fails.
Example
```
const UserSchema = z.object({ name: z.string(), email: z.string().email() });

class MyService {
  @contract({
    requires: [validates(UserSchema)],
  })
  async processUser(user: z.infer<typeof UserSchema>) {
    // user is guaranteed to conform to UserSchema here
    console.log("Processing user:", user);
  }
}
```
- Defined in conditions/validation.ts:32