escapeKey does not handle properties which begin with a number

[cjpearson]

Environment

[email protected]
[email protected]

Reproduction

https://stackblitz.com/edit/github-v2sn8k?file=modules%2Ffoo%2Findex.ts,package.json,nuxt.config.ts

Describe the bug

An identifier can contain a digit, but it cannot be the first character. When given a string such as '2xl', escapeKey does not quote the value.

A better regex might be /^[_$a-zA-Z]\w*$/. It will not match all valid identifiers (e.g. emoji), but it's better to quote unnecessarily than to miss an identifier which should be quoted.

Additional context

nuxt/nuxt#29921

Logs

No response

[cjpearson]

Should be fixed with this PR #143