JavaScript library for advanced queries #1466
Description
It would be useful to have a JavaScript library to parse and generate advanced queries. This can be used for various client-based verifications: to check whether the whole query is syntactically correct but also e.g. to check whether a query is only filtering for mutations or certain fields (this would allow a field to only accept "variant queries" as we have them in CoV-Spectrum).
ANTLR4 supports JavaScript as a target, so this hopefully isn't too hard to implement.