nope/lib/decorators.ts

// Symbols for the Property Registery:
const _registeredMethods_ = Symbol('_registedMethods_');
const _registeredParams_ = Symbol('_registedParams_');

// Interfaces for the Class
export interface IExportApiParameters {
  url: string,
}

export interface IExportMethodParameters {
  url?: string,
}

export interface IExportPropertyParameters {
  url?: string,
  readonly?: boolean
}

export const unicorn = {
  test: []
}

/**
 * Decorator used to export a Class API over openAPI
 * @param options 
 */
export function eportApi(options: IExportApiParameters) {
  return function <T extends { new(...args: any[]): {} }>(Base: T) {
    return class extends Base {
      constructor(...args: any[]) {
        super(...args);

        const _this = this as any;

        // Adding the Path Option.
        _this.__path = options.url;

        // extract the Registered Methods of the Class.
        const registeredMethods = Base.prototype[_registeredMethods_] as Map<string, IExportMethodParameters>;
        const registeredParams  = Base.prototype[_registeredParams_]  as Map<string, IExportPropertyParameters>;

        // Online if they are present, iterate over them
        if (registeredMethods) {
          _this.__dispatchRegisterdMethods = (cb: (methodName: string, callback: (...args) => Promise<any>, options: IExportMethodParameters) => void) => {
            registeredMethods.forEach((options, methodName) => {
              // Callback the Method
              cb(methodName, async (...args) => _this[methodName](...args), options);
            });
          }
        }

        // Online if they are present, iterate over them
        if (registeredParams) {
          _this.__dispatchRegisterdParams = (cb: (methodName: string, callback: (...args) => Promise<any>, options: IExportPropertyParameters) => void) => {
            registeredParams.forEach((options, methodName) => {
              // Callback the Method
              cb(methodName, async (...args) => _this[methodName](...args), options);
            });
          }
        }
      }
    };
  }
}

/**
 * Decorator, used to export the Method.
 * @param options 
 */
export function exportMethod(options: IExportMethodParameters = {}) {
  return function (target: any, propertyKey: string, descriptor: PropertyDescriptor) {
    target[_registeredMethods_] = target[_registeredMethods_] || new Map<string, IExportMethodParameters>();
    // Here we just add some information that class decorator will use
    target[_registeredMethods_].set(propertyKey, options);
  };
}

/**
 * Decorator, will create a POST and GET api for the Parameter.
 * @param options 
 */
export function exportProperty(options: IExportPropertyParameters = {}) {
  return function (target: any, propertyKey: string, descriptor: PropertyDescriptor) {
    target[_registeredParams_] = target[_registeredParams_] || new Map<string, IExportPropertyParameters>();
    // Here we just add some information that class decorator will use
    target[_registeredParams_].set(propertyKey, options);
  };
}