timers: remove dead code and simplify args check

The `setUnrefTimeout` function is never called with more arguments
than two. So quite some code was dead and never used. This removes
that code and simplifies the args check not to coerce objects to
booleans.
PR-URL: #26555
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

Author: BridgeAR

lib/internal/timers.js

@@ -102,34 +102,13 @@ Timeout.prototype.refresh = function() {
 returnthis;
 };
 
-functionsetUnrefTimeout(callback,after,arg1,arg2,arg3){
+functionsetUnrefTimeout(callback,after){
 // Type checking identical to setTimeout()
 if(typeofcallback!=='function'){
 thrownewERR_INVALID_CALLBACK();
 }
 
-leti,args;
-switch(arguments.length){
-// fast cases
-case1:
-case2:
-break;
-case3:
-args=[arg1];
-break;
-case4:
-args=[arg1,arg2];
-break;
-default:
-args=[arg1,arg2,arg3];
-for(i=5;i<arguments.length;i++){
-// Extend array dynamically, makes .apply run much faster in v6.0.0
-args[i-2]=arguments[i];
-}
-break;
-}
-
-consttimer=newTimeout(callback,after,args,false);
+consttimer=newTimeout(callback,after,undefined,false);
 getTimers()._unrefActive(timer);
 
 returntimer;

lib/timers.js

@@ -323,7 +323,7 @@ function listOnTimeout(list, now) {
 
 try{
 constargs=timer._timerArgs;
-if(!args)
+if(args===undefined)
 timer._onTimeout();
 else
 Reflect.apply(timer._onTimeout,timer,args);
@@ -462,8 +462,9 @@ function setTimeout(callback, after, arg1, arg2, arg3) {
 }
 
 setTimeout[internalUtil.promisify.custom]=function(after,value){
+constargs=value!==undefined ? [value] : value;
 returnnewPromise((resolve)=>{
-active(newTimeout(resolve,after,[value],false));
+active(newTimeout(resolve,after,args,false));
 });
 };