build failuer 失敗する「event-stream@~3.3.0」content of undefined event-stream yarn

When you build project in server, It may fail to build.
The error message show you some info about event-stream 3.3.0. so you will check that package's repogitory.
then you will see there are some problem packege itself.

you can solve it. Fix package.json like below.

package.json

"resolutions": {
"**/event-stream": "^4.0.1"
}


the resolutions is force update sub dependence package.

I can now build it
thank you