react Cannot find module 'node_m

原来运行得好好的react项目，突然运行不成功了，提示如下错误

$ npm start

> react-app-rewired start

internal/modules/cjs/loader.js:589
    throw err;
    ^

Error: Cannot find module 'D:\my_project\node_modules\react-scripts/config/webpack.config.dev.js'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:587:15)
    at Function.Module._load (internal/modules/cjs/loader.js:513:25)
    at Module.require (internal/modules/cjs/loader.js:643:17)
    at require (internal/modules/cjs/helpers.js:22:18)
    at Object.<anonymous> (D:\my_project\node_modules\react-app-rewired\scripts\start.js:18:23)
    at Module._compile (internal/modules/cjs/loader.js:707:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:718:10)
    at Module.load (internal/modules/cjs/loader.js:605:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:544:12)
    at Function.Module._load (internal/modules/cjs/loader.js:536:3)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! my_project@0.1.0 start: `react-app-rewired start --scripts-version react-scripts-ts`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the my_project@0.1.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\...\AppData\Roaming\npm-cache\_logs\2019-01-19T10_56_58_751Z-debug.log

经过四处寻找，在github找到了原因解释，只不过他的解释是针对使用了ts下的react项目，但是原理相同内容如下

This has been caused by recent changes to CRA (2.1.2) where they merged the webpack.config.dev.js and webpack.config.prod.js into a single file webpack.config.js. See #343 and #345 for more details on the change.

The adjustment to paths made in react-app-rewired in order to continue to be able to be used with CRA looks for a react-scripts version number greater than or equal to 2.1.2. The react-scripts-ts version number has been higher than that for the last ~18 months, so react-app-rewired is treating it according to the merged webpack config instead of the split one.

To solve it, you'll need to install an older version of react-app-rewired that doesn't have this change. I believe the last version of react-app-rewired that will be compatible with react-scripts-ts is version 1.6.2. The versions for 2.x have the breaking change to support CRA 2.1.2 and beyond that is misfiring on react-scripts-ts.

Use yarn add react-app-rewired@1.6.2 or npm install react-app-rewired@1.6.2 to step back to the last of the 1.x versions of react-app-rewired - it will install the older version and lock the version number to exactly that version so that it doesn't get upgraded to a newer version accidentally in future.

大致意思就是react-app-rewired这个插件升级导致了不会单独生成dev和prod配置文件了，所以导致文件找不到。需要将react-app-rewired版本固定在1.6.2，这样处理能解决上面的问题，

但是又出现了一个新问题，大致内容是can not find module react_script/package.json

分析应该也是版本问题导致的，所以通过git版本回退找到了以前的代码的package.json中react_script的使用版本是2.0.3，所以将版本也固定在了2.0.3

删掉node_modules目录，重新执行npm install

npm start 启动项目，成功启动并打开浏览器tab页。