fix: remove nullish coalescing in js files to support node 12

[ZachJW34]

• Closes UNIFY-1060

User facing changelog

Remove nullish coalescing operator in js files

Additional details

plugins/react-scripts was failing on Node v12 due to the ?? operator. It's fine in typescript files since we transpile them, but not in javascript files.

How has the user experience changed?

@cypress/react/plugins/react-scripts works with node v12

Testing

I tested this by checkout out cypress-component-testing-examples and testing against create-react-app using nvm to switch to node v12. Running npx cypress open-ct throws:

The plugins file is missing or invalid.

Your `pluginsFile` is set to `/Users/zachjw/work/cypress-component-testing-examples/create-react-app/cypress/plugins/index.js`, but either the file is missing, it contains a syntax error, or threw an error when required. The `pluginsFile` must be a `.js`, `.ts`, or `.coffee` file.

Or you might have renamed the extension of your `pluginsFile`. If that's the case, restart the test runner.

Please fix this, or set `pluginsFile` to `false` if a plugins file is not necessary for your project.

 /Users/zachjw/work/cypress-component-testing-examples/create-react-app/node_modules/@cypress/react/plugins/utils/get-transpile-folders.js:5
  const rawFolders = config.addTranspiledFolders ?? []
                                                  ^

SyntaxError: Unexpected token '?'

...

Then, run yarn workspace @cypress/react build and copy and paste the npm/react/plugins and npm/react/dist folders into ~/<path-to-repo>/cypress-component-testing-examples/create-react-app/node_modules/@cypress/react and run npx cypress open-ct. No failure!

PR Tasks

• Have tests been added/updated?
• Has the original issue (or this PR, if no issue exists) been tagged with a release in ZenHub? (user-facing changes only)
• Has a PR for user-facing changes been opened in cypress-documentation?
• Have API changes been updated in the type definitions?
• Have new configuration options been added to the cypress.schema.json?

[cypress-bot]

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[cypress]

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Test summary

576 • 0 • 0 • 0 • 0

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Run details

Project	cypress
Status	Passed
Commit	32b061f
Started	Feb 8, 2022 5:28 PM
Ended	Feb 8, 2022 5:38 PM
Duration	09:08 💡
OS	Linux Debian - 10.10
Browser	Electron 94

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