IDEA shows warning "unused function declaration" for inline functions. This bug was marked resolved (IDEADEV-23553), but I still see the problem. I've included a more complete example with comments as well as a screen shot. This is inside a javascript file (bug.js) function aaa(){ /* nested functions works as expected */ bbb(); function bbb(){} ccc(); function ccc(){} /* nested functions do NOT work as expected */ ddd(); eee(); function ddd(){} /// function ddd() appears unused because the function call eee() is between this function and it's caller function eee(){} /// /* nested functions do NOT work as expected */ fff(); ggg() hhh(); iii(); // only the closest function call iii will show its function as used function fff(){} function ggg(){} function hhh(){} function iii(){} // only the closest function call iii will show its function as used /* nested functions do NOT work as expected */ jjj(); kkk(); function jjj(){} // this function is shown as used only because a call to it appears below function kkk(){} kkk(); // after the fact function calls in between do not appear to be a factor jjj(); // this causes function jjj() to appear as used } /* non-nested functions does NOT behave as expected */ function lll(){} // not used and not reported as such /* non-nested functions behave as expected */ mmm(); nnn(); function mmm(){} function nnn(){}