visit ( msg : Model . Message , visitors : { attributes ?: ( attributes : Attributes , context : "declaration" | "placeholder" , ) => void | () => void ; declaration ?: ( declaration : Model . Declaration ) => void | () => void ; expression ?: ( expression : Model . Expression , context : "declaration" | "placeholder" , ) => void | () => void ; functionRef ?: ( functionRef : Model . FunctionRef , context : "declaration" | "placeholder" , argument : undefined | Model . VariableRef | Model . Literal , ) => void | () => void ; key ?: ( key : Model . Literal | Model . CatchallKey , index : number , keys : (
Model . Literal | Model . CatchallKey )
[] , ) => void ; markup ?: ( markup : Model . Markup , context : "declaration" | "placeholder" , ) => void | () => void ; node ?: ( node : Node , ... rest : unknown [] ) => void ; options ?: ( options : Options , context : "declaration" | "placeholder" , ) => void | () => void ; pattern ?: ( pattern : Model . Pattern ) => void | () => void ; value ?: ( value : Model . VariableRef | Model . Literal , context : "declaration" | "placeholder" | "selector" , position : "arg" | "option" | "attribute" , ) => void ; variant ?: ( variant : Model . Variant ) => void | () => void ; } , ) : void Parameters msg : Model . Message visitors : { attributes ?: ( attributes : Attributes , context : "declaration" | "placeholder" , ) => void | () => void ; declaration ?: ( declaration : Model . Declaration ) => void | () => void ; expression ?: ( expression : Model . Expression , context : "declaration" | "placeholder" , ) => void | () => void ; functionRef ?: ( functionRef : Model . FunctionRef , context : "declaration" | "placeholder" , argument : undefined | Model . VariableRef | Model . Literal , ) => void | () => void ; key ?: ( key : Model . Literal | Model . CatchallKey , index : number , keys : (Model . Literal | Model . CatchallKey )[] , ) => void ; markup ?: ( markup : Model . Markup , context : "declaration" | "placeholder" , ) => void | () => void ; node ?: ( node : Node , ... rest : unknown [] ) => void ; options ?: ( options : Options , context : "declaration" | "placeholder" , ) => void | () => void ; pattern ?: ( pattern : Model . Pattern ) => void | () => void ; value ?: ( value : Model . VariableRef | Model . Literal , context : "declaration" | "placeholder" | "selector" , position : "arg" | "option" | "attribute" , ) => void ; variant ?: ( variant : Model . Variant ) => void | () => void ; } Returns void
Apply visitor functions to message nodes.
The visitors are applied in source order, starting from the root. Visitors for nodes that contain other nodes may return a callback function that will be called with no arguments when exiting the node.
If set, the
nodevisitor is called for all Node values for which an explicit visitor is not defined.Many visitors will be called with additional arguments identifying some of the context for the visited node.