javascript - Debounce function implemented with promises -

i'm trying implement debounce function works promise in javascript. way, each caller can consume result of "debounced" function using promise. here best have been able come far:

function debounce(inner, ms = 0) {   let timer = null;   let promise = null;   const events = new eventemitter();  // need this?    return function (...args) {     if (timer == null) {       promise = new promise(resolve => {         events.once('done', resolve);       });     } else {       cleartimeout(timer);     }      timer = settimeout(() => {       events.emit('done', inner(...args));       timer = null;     }, ms);      return promise;   }; } 

ideally, implement utility function without introducing dependency on eventemitter (or implementing own basic version of eventemitter), can't think of way it. thoughts?

i found better way implement promises:

function debounce(inner, ms = 0) {   let timer = null;   let resolves = [];    return function (...args) {         // run function after amount of time     cleartimeout(timer);     timer = settimeout(() => {       // result of inner function, apply resolve function of       // each promise has been created since last time inner function run       let result = inner(...args);       resolves.foreach(r => r(result));       resolves = [];     }, ms);      return new promise(r => resolves.push(r));   }; } 

i still welcome suggestions, new implementation answers original question how implement function without dependency on eventemitter (or it).