安装： npm install 启动： npm start

如果重新 clone react，有以下三个文件需要更改：

1. /src/react/packages/react-reconciler/src/ReactFiberHostConfig.js

//invariant(false, 'This module must be shimmed by a specific renderer.'); //sy
export * from "./forks/ReactFiberHostConfig.dom";

2. /src/react/packages/shared/invariant.js

export default function invariant(condition, format, a, b, c, d, e, f) {
  if (condition) return; //加上这个
  throw new Error(
    "Internal React error: invariant() is meant to be replaced at compile " +
      "time. There is no runtime version."
  );
}

3. /src/react/packages/shared/ReactSharedInternals.js

// import React from 'react';
// const ReactSharedInternals =
//   React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;

import ReactSharedInternals from "../react/src/ReactSharedInternals";

4. /Users/gaoshaoyun/Documents/library/DebugReact/src/react/packages/scheduler/index.js

   'use strict';
   
   export * from './src/Scheduler';
   //添加以下
   export {
     unstable_flushAllWithoutAsserting,
     unstable_flushNumberOfYields,
     unstable_flushExpired,
     unstable_clearYields,
     unstable_flushUntilNextPaint,
     unstable_flushAll,
     unstable_yieldValue,
     unstable_advanceTime,
   } from './src/SchedulerHostConfig.js';

5. react/packages/scheduler/src/SchedulerHostConfig.js

// 注释掉这里
// throw new Error('This module must be shimmed by a specific build.');

// 添加以下
export {
  unstable_flushAllWithoutAsserting,
  unstable_flushNumberOfYields,
  unstable_flushExpired,
  unstable_clearYields,
  unstable_flushUntilNextPaint,
  unstable_flushAll,
  unstable_yieldValue,
  unstable_advanceTime,
} from './forks/SchedulerHostConfig.mock.js';

export {
  requestHostCallback,
  requestHostTimeout,
  cancelHostTimeout,
  shouldYieldToHost,
  getCurrentTime,
  forceFrameRate,
  requestPaint,
} from './forks/SchedulerHostConfig.default.js';

参考： nannongrousong/blog#1 https://github.com/bubucuo/react-sourcecode-debug-env