Unknown signal: null error with Node 12 .13.1

[asadsaeed]

Describe the bug
Unable to setup project on windows 10. After running "yarn install" it's install all package and then throw the following errors

[5/5] Building fresh packages...
$ if [ "$NODE_ENV" = production ] ; then npm run prod-build && npm run prod-stat
ic-upload && npm run install-config-file && npm run notify-slack; fi
"$NODE_ENV" was unexpected at this time.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this
command.

To Reproduce
Steps to reproduce the behavior:

1. Clone repository locally
2. Setup postgres
3. Install the Node version listed in .nvmrc. NVM
4. Run yarn install command

Expected behavior
Should install all packages successfully.

Screenshots

Platform:

• OS: Windows 10, 64 bit

[Frydafly]

Hi @asadsaeed checking whether this is still an issue? Would love to help you get past this! Let me know