strict mode worries the IDE

code using the 'use strict' directive is identified by the editor, but
brings up error message for built-in library functions (see attached image)

function test_strict(){
  "use strict";
  
  var N=false;   // oops - typo...
  setInterval( function(){
    LED2.write( n);
    n = !n;
  },1000);
}

is there any libraray available to satisfy the editor's strict validator?

ps: the esprima minifyer ignores the strict directive, and reports even bad code to be fine

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