Number.MAX_SAFE_INTEGER is unknown

[PavelKastornyy]

This is my code:

let a: number = Number.MAX_VALUE; //OK
let b: number = Number.MAX_SAFE_INTEGER; //ERROR

The error is shown only in Netbeans Editor, the code is compiled without any problems.
Here they say Number.MAX_SAFE_INTEGER must work in ES6.

This is the list of files in lib folder to which nbts plugin is set.

cancellationToken.js		   lib.es2015.d.ts		     lib.es2017.object.d.ts	    lib.esnext.d.ts		      tsserver.js
cs				   lib.es2015.generator.d.ts	     lib.es2017.sharedmemory.d.ts   lib.esnext.full.d.ts	      tsserverlibrary.d.ts
de				   lib.es2015.iterable.d.ts	     lib.es2017.string.d.ts	    lib.esnext.intl.d.ts	      tsserverlibrary.js
diagnosticMessages.generated.json  lib.es2015.promise.d.ts	     lib.es2017.typedarrays.d.ts    lib.esnext.symbol.d.ts	      typescript.d.ts
es				   lib.es2015.proxy.d.ts	     lib.es2018.d.ts		    lib.scripthost.d.ts		      typescript.js
fr				   lib.es2015.reflect.d.ts	     lib.es2018.full.d.ts	    lib.webworker.d.ts		      typescriptServices.d.ts
it				   lib.es2015.symbol.d.ts	     lib.es2018.intl.d.ts	    lib.webworker.importscripts.d.ts  typescriptServices.js
ja				   lib.es2015.symbol.wellknown.d.ts  lib.es2018.promise.d.ts	    pl				      typesMap.json
ko				   lib.es2016.array.include.d.ts     lib.es2018.regexp.d.ts	    protocol.d.ts		      typingsInstaller.js
lib.dom.d.ts			   lib.es2016.d.ts		     lib.es5.d.ts		    pt-br			      watchGuard.js
lib.dom.iterable.d.ts		   lib.es2016.full.d.ts		     lib.es6.d.ts		    README.md			      zh-cn
lib.d.ts			   lib.es2017.d.ts		     lib.esnext.array.d.ts	    ru				      zh-tw
lib.es2015.collection.d.ts	   lib.es2017.full.d.ts		     lib.esnext.asynciterable.d.ts  tr
lib.es2015.core.d.ts		   lib.es2017.intl.d.ts		     lib.esnext.bigint.d.ts	    tsc.js

Could anyone say how to fix it?