A path to generate PSI-files in, relative to the content root of the BNF file. Used for separating PSI logic from parsers.
It is required if a Syntax-API parser is intended to be KMP-compatible. (Kotlin-based generation only)
Examples:
{
//Given that BNF file is located at "path/to/project/somModule/src/main/grammars/grammar.bnf"
//Resulting PSI files would be placed in "path/to/project/someOtherModule/output/gen"
psiOutputPath="../someOtherModule/output"
}