TypeScript: avoid trailing commas on index signatures with only one parameter #7836
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Fixes #7834. Specifically, it now outputs the trailing comma only when there's multiple parameters. In the usual (non-error) case, it treats it like a computed property name and therefore omits the trailing comma.
See #7224 and #7228 for some context.
changelog_unreleased/*/pr-XXXX.mdfile followingchangelog_unreleased/TEMPLATE.md.✨Try the playground for this PR✨