How to use the antlr4/index.tree function in antlr4

// Generated from Ballerina.g4 by ANTLR 4.5.3
// jshint ignore: start
var antlr4 = require('antlr4/index');

// This class defines a complete generic visitor for a parse tree produced by BallerinaParser.

class BallerinaVisitor extends antlr4.tree.ParseTreeVisitor {
    constructor() {
        super();
        return this;
    }

    // Visit a parse tree produced by BallerinaParser#compilationUnit.
    visitCompilationUnit(ctx) {
    }

    // Visit a parse tree produced by BallerinaParser#packageDeclaration.
    visitPackageDeclaration(ctx) {
    }

    // Visit a parse tree produced by BallerinaParser#importDeclaration.
    visitImportDeclaration(ctx) {
    }

// Generated from Ballerina.g4 by ANTLR 4.5.3
// jshint ignore: start
var antlr4 = require('antlr4/index');

// This class defines a complete listener for a parse tree produced by BallerinaParser.
class BallerinaListener extends antlr4.tree.ParseTreeListener {
    constructor() {
        super();
        return this;
    }

    // Enter a parse tree produced by BallerinaParser#compilationUnit.
    enterCompilationUnit(ctx) {
    }

    // Exit a parse tree produced by BallerinaParser#compilationUnit.
    exitCompilationUnit(ctx) {
    }

    // Enter a parse tree produced by BallerinaParser#packageDeclaration.
    enterPackageDeclaration(ctx) {
    }

// Generated from Java.g4 by ANTLR 4.5
// jshint ignore: start
var antlr4 = require('antlr4/index');

// This class defines a complete listener for a parse tree produced by JavaParser.
function JavaListener() {
	antlr4.tree.ParseTreeListener.call(this);
	return this;
}

JavaListener.prototype = Object.create(antlr4.tree.ParseTreeListener.prototype);
JavaListener.prototype.constructor = JavaListener;

// Enter a parse tree produced by JavaParser#compilationUnit.
JavaListener.prototype.enterCompilationUnit = function(ctx) {
};

// Exit a parse tree produced by JavaParser#compilationUnit.
JavaListener.prototype.exitCompilationUnit = function(ctx) {
};


// Enter a parse tree produced by JavaParser#packageDeclaration.
JavaListener.prototype.enterPackageDeclaration = function(ctx) {
};

// Exit a parse tree produced by JavaParser#packageDeclaration.

// Generated from grammars/Python3.g4 by ANTLR 4.7.1
// jshint ignore: start
var antlr4 = require('antlr4/index');

// This class defines a complete listener for a parse tree produced by Python3Parser.
function Python3Listener() {
	antlr4.tree.ParseTreeListener.call(this);
	return this;
}

Python3Listener.prototype = Object.create(antlr4.tree.ParseTreeListener.prototype);
Python3Listener.prototype.constructor = Python3Listener;

// Enter a parse tree produced by Python3Parser#single_input.
Python3Listener.prototype.enterSingle_input = function(ctx) {
};

// Exit a parse tree produced by Python3Parser#single_input.
Python3Listener.prototype.exitSingle_input = function(ctx) {
};


// Enter a parse tree produced by Python3Parser#file_input.
Python3Listener.prototype.enterFile_input = function(ctx) {
};

// Exit a parse tree produced by Python3Parser#file_input.

// @ts-nocheck
// Generated from sexpression.g4 by ANTLR 4.7.2
// jshint ignore: start
var antlr4 = require('antlr4/index');

// This class defines a complete listener for a parse tree produced by sexpressionParser.
function sexpressionListener() {
	antlr4.tree.ParseTreeListener.call(this);
	return this;
}

sexpressionListener.prototype = Object.create(antlr4.tree.ParseTreeListener.prototype);
sexpressionListener.prototype.constructor = sexpressionListener;

// Enter a parse tree produced by sexpressionParser#sexpr.
sexpressionListener.prototype.enterSexpr = function(ctx) {
};

// Exit a parse tree produced by sexpressionParser#sexpr.
sexpressionListener.prototype.exitSexpr = function(ctx) {
};


// Enter a parse tree produced by sexpressionParser#item.
sexpressionListener.prototype.enterItem = function(ctx) {
};

// Exit a parse tree produced by sexpressionParser#item.

function VariableDeclarationListener() {
	antlr4.tree.ParseTreeListener.call(this);
	return this;
}

function LUFileParserListener() {
	antlr4.tree.ParseTreeListener.call(this);
	return this;
}

function ExprListener() {
	antlr4.tree.ParseTreeListener.call(this);
	return this;
}

function LuaListener() {
	antlr4.tree.ParseTreeListener.call(this);
	return this;
}

function SolidityVisitor() {
	antlr4.tree.ParseTreeVisitor.call(this);
	return this;
}