解决使用jenkins构建react项目失败

• Jenkins构建react项目失败，报错如下：
• 解决方法

Jenkins构建react项目失败，报错如下：

yarn build 
yarn run v1.22.17
$ node scripts/build.js
Creating an optimized production build...

Treating warnings as errors because process.env.CI = true.
Most CI servers set it automatically.

Failed to compile.

./src/pages/sacrifice/index.jsx
  Line 1:17:      'PureComponent' is defined but never used    

....省略一堆错误
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
Build step 'Execute Windows batch command' marked build as failure
Finished: FAILURE

Treating warnings as errors because process.env.CI = true.CI模式会把所有的warning当做errors处理，所以在服务器上自动执行命令会报错，我们只要把所有的warning解决掉就可以了。

解决方法

设置系统变量：

process.env.CI = false;