Force Node.js 14 Cloud Function runtime

[jthegedus]

Is your feature request related to a problem? Please describe.

SvelteKit should be deployed to Node.js 14 Cloud Functions. The template initialised by firebase init functions defaults to Node.js 12 so errors around this are likely to crop up. #47 is an example of not targetting v14.

Describe the solution you'd like

Error if Node.js 14 is not detected in either:

• the functions/package.json engines.node field
• the firebase.json functions.runtime field - add in Enable functions runtime engine config through firebase.json firebase/firebase-tools#2241 and released in https://github.com/firebase/firebase-tools/releases/tag/v8.6.0

Describe alternatives you've considered

Additional context

The only reason I know of the firebase.json.functions.runtime field is from reading firebase-tools release notes religiously, not because it was easily found in the Firebase documentation.

[github-actions]

🎉 This issue has been resolved in version 0.7.3 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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