Option	Possible Values	Description
psi	yes, no	PSI: generate PSI classes
psi-classes-map	yes, no	PSI: generate IElementType to node class map
psi-factory	yes, no	PSI: generate PsiElement for ASTNode node factory
visitor	yes, no	PSI: generate visitor for PSI classes
visitor-value	void, name of type parameter	PSI: generate visitor with generic argument
fqn	no, yes	PSI: generate fully qualified class names
elements	yes, no	Types: generate composite element type constants
element-case	lower | upper | as-is	Types: composite element type constants case option
tokens	yes, no	Types: generate token constants
token-case	lower | upper | as-is	Types: token type constants case option
token-sets	yes, no	Types: generate token sets from top-level choice rules
exact-types	all | no | tokens, elements	Types: token and element types constants exact type; no means IElementType
token-accessors	yes, no	PSI: generate token getters
names	short, long, classic	Parser: local variables style
first-check	positive number, 2	Parser: generate FIRST-based look-ahead optimization
java	6, 8, 11, etc.	Generator: generate lambda-s or other language constructs supported in selected version
...	...	...

Examples:

  {
    // turn off PSI classes generation and token constants
    // .. and prefer classic names
    generate=[psi="no" tokens="no" names="short"]
  }