Fresh install errors - possibly due to core-js@2.6.11

[StarfallProjects]

Describe the bug
Trying to do a fresh local install of 11ty for a new project, getting errors on install. Installation does not complete (11ty doesn't end up listed in the package.json, and doesn't run)

To Reproduce

1. Run npm install --save-dev @11ty/eleventy
2. See it throw an error:

npm ERR! code ELIFECYCLE
npm ERR! syscall spawn =
npm ERR! file =
npm ERR! path =
npm ERR! errno ENOENT
npm ERR! core-js@2.6.11 postinstall: `node -e "try{require('./postinstall')}catch(e){}"`
npm ERR! spawn = 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.

3. Try to run with npx @11ty/eleventy (just in case it's an ignorable error)
4. See it throw another error:

internal/modules/cjs/loader.js:796
    throw err;
    ^

Error: Cannot find module 'C:\Users\debor\Desktop\Code\habermas-terminology\node_modules\@11ty\eleventy\cmd.js'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:793:17)
    at Function.Module._load (internal/modules/cjs/loader.js:686:27)
    at Function.Module.runMain (internal/modules/cjs/loader.js:1043:10)
    at internal/main/run_main_module.js:17:11 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}

Environment:

• Windows 10, PowerShell
• latest on npm (as of 22nd Feb 2020)

Other
Note that the installation also warns that core-js@2.6.11 is no longer maintained and should be upgraded to 3.x

[zachleat]

What’s your node --version?

[StarfallProjects]

12.15.0

[StarfallProjects]

I upgraded to 12.16.1 (the current LTS: https://nodejs.org/en/) and still get the same error.

[DirtyF]

Not reproduced on latest macOS with current LTS node:

volta install @11ty/eleventy@latest
success: installed @11ty/eleventy@0.10.0 with executables: eleventy

[StarfallProjects]

Still having the errors today, so went and tried on Ubuntu via WSL. Node 12.6.1, latest 11ty, and it installed and ran, albeit with quite a few warnings. No errors though.

It looks like somehow Windows/Node on Windows is being more sensitive about the outdated corejs?

[StarfallProjects]

Tried it on Windows with Git Bash today (in case it was Powershell being a pain) and still had the errors.

[pdehaan]

I wonder if this is related to zloirock/core-js#582

[StarfallProjects]

@pdehaan that looks like a Powershell issue? Would it explain seeing it in git bash as well?

And I have had successful 11ty installs in the past couple of months,

Edit to add: had time to investigate more today. Went and checked in case I had set my npm script-shell to be Powershell, and:

C:\Users\debor\Desktop> npm config get script-shell
=                                                                         

Not terribly informative, but decided to try unsetting it.
Got:

PS C:\Users\debor\Desktop> npm config get script-shell                                                                  null

And voila - 11ty installed again (various warnings, no errors)

So yup, looks like it was something to do with that issue you linked, thank you!

[zachleat]

@StarfallProjects okay to close as issue in dependency?

[StarfallProjects]

@zachleat yes - thanks for the community help on this! I guess I am once again the PowerShell-shaped canary in the coalmine 🤦‍♀

[zachleat]

Thank you!