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Given JSONata is implemented in languages other than Javascript too, I am unsure about this change. I feel like the input should be valid JSON, even though I'm pretty sure I've fallen foul of this too, and appreciate the attempt to make things easier. |
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Hey @mattbaileyuk thanks for your feedback! Yeah I expected that this might be controversial as trailing commas are not liked by everyone even in the JS world 😅 Feel free to close the PR if you decide not to go that way! :-) |
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Fixes #637
It's probably a philosophy question whether trailing commas should be supported: they are valid in JavaScript but not valid in JSON.
I encountered many cases where I removed a line from an JSONata expression but I forgot to remove the trailing comma in the previous line and encountered an error.
Such cases would usually be auto-fixed by the linter/formatter/IDE, but since we don't have built-in support for JSONata, I personally think trailing commas would be convenient to reduce such stylistic errors.