Create getter on the flow

getterbuild.ts

function createMethod(name: string, value: string, parent, theContext) {
  const getter = function() {
    parent.endpoint = value;
    return parent.endpoint;
  };

  Object.defineProperty(theContext, name, {
    get: getter,
    enumerable: true,
    configurable: true
  });
}

function registerMethods(methods: any[], context, parent) {
  methods.forEach(item => {
    createMethod(item.k, item.v, parent, context);
  });
}

export default function register(contextMember: string) {
  return function(
    target: any,
    propertyKey: string,
    descriptor: PropertyDescriptor
  ) {
    const originalMethod = descriptor.value;
    descriptor.value = function() {
      const parent = target[contextMember];
      const methods = originalMethod.apply(this, arguments);
      registerMethods(methods, target, parent);
    };
    return descriptor;
  };
}