create-react-app Failed at the core-js@2.6.11 postinstall script

[CGawronski]

Windows 10
node version: 12.13.1
npm version: 6.13.7

Log of the failure:

C:\Users\colin\Web_Development\React>npx create-react-app jsx

Creating a new React app in C:\Users\colin\Web_Development\React\jsx.

Installing packages. This might take a couple of minutes.
Installing react, react-dom, and react-scripts with cra-template...

> core-js@2.6.11 postinstall C:\Users\colin\Web_Development\React\jsx\node_modules\babel-runtime\node_modules\core-js
> node -e "try{require('./postinstall')}catch(e){}"

npm ERR! code ELIFECYCLE
npm ERR! syscall spawn C:\Program Files (x86)\git\bin\bash.exe
npm ERR! file C:\Program Files (x86)\git\bin\bash.exe
npm ERR! path C:\Program Files (x86)\git\bin\bash.exe
npm ERR! errno ENOENT
npm ERR! core-js@2.6.11 postinstall: `node -e "try{require('./postinstall')}catch(e){}"`
npm ERR! spawn C:\Program Files (x86)\git\bin\bash.exe ENOENT
npm ERR!
npm ERR! Failed at the core-js@2.6.11 postinstall 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\colin\AppData\Roaming\npm-cache\_logs\2020-02-06T23_30_34_240Z-debug.log

Aborting installation.
  npm install --save --save-exact --loglevel error react react-dom react-scripts cra-template has failed.

Deleting generated file... node_modules
Deleting generated file... package.json
Deleting jsx/ from C:\Users\colin\Web_Development\React
Done.

Any help would be appreciated.

Thank you

[Dergash]

Hello @CGawronski! It's an interesting problem you have, I was able to reproduce it and I think I know what causing it.

Judging by a error message

npm ERR! spawn C:\Program Files (x86)\git\bin\bash.exe ENOENT

I imagine things went like this:

1. CRA dependens on core-js for ie11 support
2. core-js contains postinstall script which spawns a separate process via node -e call
3. Child process requires a script shell and node tries to find it in a wrong place.
   Now here things become interesting: I believe nodeJS should use ComSpec enviromental variable to get the path for script shell, but when child process is spawned, some hardcoded value C:\Program Files (x86)\git\bin\bash.exe is used (definetly hardcoded at some period, see child_process: Support bash as shell. nodejs/node#10333) instead of ComSpec variable.

I believe you could resolve the problem by running:

npm config set script-shell "C:\\Program Files\\git\\bin\\bash.exe"

where instead of C:\programgiles you should specify path where your actual bash.exe or cmd.exe are located.
This will create a record in your .npmrc file which will be used to spawn child node processes.
Alternatively you could check if your ComSpec or PATH enviromental variables includes `C:\Program Files (x86)\git\bin\bash.exe' value and replace it with path to your actual shell executable

[CGawronski]

Hi @Dergash Thank you!

That was a silly mistake. You were correct and my bash.exe was located in another path. After changing path and re-running create-react-app everything seems to be working.

Thank you very much!!