TypeError: Class constructor Lexer cannot be invoked without 'new'

[AdityaDaksha]

 ngOnInit() {
      //console.log(this.response);
      this.testAntlr4ts();
 }

  testAntlr4ts() {
      // Create the lexer and parser
      let inputStream = new ANTLRInputStream("text");
      let lexer = new GrammerLexer(inputStream);
      let tokenStream = new CommonTokenStream(lexer);
      let parser = new GrammerParser(tokenStream);

      //parser.buildParseTrees = true;
      let tree = parser.expression();
      console.log(tree);
  }

getting below exception:

at new BQLLexer (http://localhost:4200/main.bundle.js:732:16)
    at RuleAppComponent.webpackJsonp.750.RuleAppComponent.testAntlr4ts (http://localhost:4200/main.bundle.js:546:21)
    at RuleAppComponent.webpackJsonp.750.RuleAppComponent.ngOnInit (http://localhost:4200/main.bundle.js:541:14)
    at Wrapper_RuleAppComponent.ngDoCheck (/AppModule/RuleAppComponent/wrapper.ngfactory.js:22:53)
    at CompiledTemplate.proxyViewClass.View_AppComponent0.detectChangesInternal (/AppModule/AppComponent/component.ngfactory.js:53:30)
    at CompiledTemplate.proxyViewClass.AppView.detectChanges (http://localhost:4200/vendor.bundle.js:114333:14)
    at CompiledTemplate.proxyViewClass.DebugAppView.detectChanges (http://localhost:4200/vendor.bundle.js:114528:44)
    at CompiledTemplate.proxyViewClass.AppView.internalDetectChanges (http://localhost:4200/vendor.bundle.js:114318:18)
    at CompiledTemplate.proxyViewClass.View_AppComponent_Host0.detectChangesInternal (/AppModule/AppComponent/host.ngfactory.js:29:19)
    at CompiledTemplate.proxyViewClass.AppView.detectChanges (http://localhost:4200/vendor.bundle.js:114333:14)
    at CompiledTemplate.proxyViewClass.DebugAppView.detectChanges (http://localhost:4200/vendor.bundle.js:114528:44)
    at ViewRef_.detectChanges (http://localhost:4200/vendor.bundle.js:76866:20)
    at http://localhost:4200/vendor.bundle.js:51073:67
    at Array.forEach (native)
    at ApplicationRef_.tick (http://localhost:4200/vendor.bundle.js:51073:25)

package.json

{
  "name": "app",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve --proxy-config proxy.config.json",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e",
    "antlr4ts": "antlr4ts -visitor C:/**/Grammer.g4"
  },
  "private": true,
  "dependencies": {
    "@angular/common": "^2.4.0",
    "@angular/compiler": "^2.4.0",
    "@angular/core": "^2.4.0",
    "@angular/forms": "^2.4.0",
    "@angular/http": "^2.4.0",
    "@angular/platform-browser": "^2.4.0",
    "@angular/platform-browser-dynamic": "^2.4.0",
    "@angular/router": "^3.4.0",
    "angular-split": "^0.1.20",
    "angular2-froala-wysiwyg": "^2.5.1-2",
    "angular2-resizable": "^0.4.1",
    "bootstrap": "^3.3.7",
    "core-js": "^2.4.1",
    "ng2-bootstrap": "^1.6.1",
    "rxjs": "^5.1.0",
    "zone.js": "^0.7.6",
    "antlr4ts": "^0.4.0-alpha.4"
  },
  "devDependencies": {
    "@angular/cli": "1.0.0-rc.1",
    "@angular/compiler-cli": "^2.4.0",
    "@types/jasmine": "2.5.38",
    "@types/node": "~6.0.60",
    "antlr4ts": "^0.4.0-alpha.4",
    "antlr4ts-cli": "^0.4.0-alpha.4",
    "codelyzer": "~2.0.0",
    "jasmine-core": "~2.5.2",
    "jasmine-spec-reporter": "~3.2.0",
    "karma": "~1.4.1",
    "karma-chrome-launcher": "~2.0.0",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^0.2.0",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "^5.1.1",
    "ts-node": "~2.0.0",
    "tslint": "~4.4.2",
    "typescript": "~2.0.0"
  }
}

[nehaagrawal]

can someone please help us here. We are getting this error when it executes constructor for Lexer.js

//generated code from MyLexer.ts
constructor(input: CharStream) {
		super(input); // it fails here while calling Lexer.js 
		this._interp = new LexerATNSimulator(BQLLexer._ATN, this);
	}

[BurtHarris]

To date, we have not tackled getting antlr4ts to run on browsers, we recognize that it's desirable but it is not currently in scope for our first release, so helping with the current info provided is tricky. If you can simplify the sample code for this issue to be node.js only, we can probably tackle it sooner. Ideally you could point me at a simpler sample project on github rather than embed project files in the issue description.

[mindhivefi]

I think this could be fixed by setting the tsconfig's target to es5. Is there some reason why it has been set to es2015?

[sharwell]

Duplicate of #326