[eslint] Require trailing commas where useful #355
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This is a small part of #347 as suggested in #347 (comment).
https://eslint.org/docs/rules/comma-dangle
Including a trailing comma when the closing
]or}is on a different line means that it's easier to see what's changed when reviewing code. Adding a new item to an array or property to an object means that only the new line needs to be added, and no existing lines need to be modified; removing an item or property means that only that line needs to be removed with others remaining unchanged.