* [client] add friendly console log on '<' syntax error
Issue: when a javascript file is served with invalid contents, sometimes
it means that a fallback html file was returned from server instead.
This can be hard to determine because the stack trace is not helpful and
the `filename` information was previously lost from the global error
handler.
Added a specific error for this case to produce a friendlier error
message on the console.
* Add ace define override for custom mode
* Apply prettier changes
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Co-authored-by: Justin Clift <justin@postgresql.org>
