outline/server/__mocks__/dd-trace.ts

/* eslint-disable @typescript-eslint/explicit-function-return-type */
import { Tracer } from "dd-trace";

// eslint-disable-next-line @typescript-eslint/no-empty-function
const emptyFn = function () {};

const callableHandlers = {
  get<T, P extends keyof T>(_target: T, _prop: P, _receiver: any): T[P] {
    const newMock = new Proxy(emptyFn, callableHandlers);
    return newMock as any as T[P];
  },

  apply<T extends (...args: any) => any, A extends Parameters<T>>(
    _target: T,
    _thisArg: any,
    _args: A
  ): ReturnType<T> {
    const newMock = new Proxy(emptyFn, callableHandlers);
    return newMock as any as ReturnType<T>;
  },
};

const callableMock = new Proxy(emptyFn, callableHandlers);

type MockTracer = Tracer & { isMock?: boolean };

export const mockTracer = new Proxy({} as MockTracer, {
  get<K extends keyof MockTracer>(_target: Tracer, key: K) {
    if (key === "isMock") {
      return true;
    }

    if (key === "wrap") {
      return (_: any, f: any) => f;
    }

    return callableMock;
  },
});