Resolve Nx generator unit test issues in Nx 18 + Jest 29.

test-setup.ts

/// <reference types="jest" />
import type { createProjectGraphAsync } from '@nx/devkit';

/**
 * Resolve `TypeError: performance.mark is not a function`.
 *
 * @see https://github.com/nrwl/nx/issues/23435#issuecomment-2127183725
 */
const performanceMock: Performance = {
  ...performance,
  mark: jest.fn(),
  measure: jest.fn(),
};
Object.defineProperties(globalThis, {
  performance: { value: performanceMock },
});
jest.doMock('perf_hooks', () => ({
  ...jest.requireActual('perf_hooks'),
  performance: performanceMock,
}));
jest.doMock('node:perf_hooks', () => ({
  ...jest.requireActual('node:perf_hooks'),
  performance: performanceMock,
}));

/**
 * Resolve `LoadPluginError: Could not load plugin node_modules/nx/src/plugins/project-json/build-nodes/package-json-next-to-project-json`.
 *
 * When `createProjectGraphAsync` is called during tests, if its not
 * mocked, it will return the actual Nx workspace's project graph. We
 * don't want any unit tests to depend on the structure of the actual
 * Nx workspace, so we mock it to return an empty project graph.
 *
 * @see https://github.com/nrwl/nx/issues/23435
 * @see https://github.com/nrwl/nx/blob/0392a67a70e26ddf19a9fffc3131370c427aae0b/scripts/unit-test-setup.js
 */
jest.doMock('@nx/devkit', () => ({
  ...jest.requireActual('@nx/devkit'),
  createProjectGraphAsync: jest.fn().mockImplementation(
    (): ReturnType<typeof createProjectGraphAsync> =>
      Promise.resolve({
        nodes: {},
        dependencies: {},
      })
  ),
}));