new

things/nest/src/dto/ReturnMessage.dto.ts

@@ -29,13 +29,24 @@ export class BlankReturnMessageDto implements BlankReturnMessage {
   }
 }
 
-export class ReturnMessageDto<T>
-  extends BlankReturnMessageDto
-  implements ReturnMessage<T> {
-  @ApiProperty({ description: '返回内容' })
-  data?: T;
-  constructor(statusCode: number, message?: string, data?: T) {
+export type AnyClass = new (...args: any[]) => any;
+export type ClassType<T> = new (...args: any[]) => T;
+export type ClassOrArray = AnyClass | [AnyClass];
+export type TypeFromClass<T extends AnyClass> = T extends new (
+  ...args: any[]
+) => infer U
+  ? U
+  : never;
+export type ParseType<T> = T extends [ClassType<infer U>] ? U : ClassType<T>;
+
+export function ReturnMessageDto<T extends ClassOrArray>(type: T) {
+  const cl = class SpecificReturnMessage extends BlankReturnMessageDto {
+    data?: ParseType<T>;
+    constructor(statusCode: number, message?: string, data?: ParseType<T>) {
       super(statusCode, message);
       this.data = data;
     }
+  };
+  ApiProperty({ description: '返回数据', type })(cl.prototype, 'data');
+  return cl;
 }