BUG-setTimeout.ts

import {
  assertEquals,
} from "https://deno.land/[email protected]/testing/asserts.ts";

import { spy } from "https://deno.land/x/[email protected]/mod.ts";
import type { Spy } from "https://deno.land/x/[email protected]/mod.ts";
import { delay } from "https://deno.land/[email protected]/async/delay.ts";

type Callable = (...arg:any[])=>any


// BUG
// Uncaught RangeError: Maximum call stack size exceeded
// at handleAsyncMsgFromRust (deno:core/core.js:70:23)
// https://github.com/denoland/deno/blob/fd3b961126150960104a0d456ceac14b12f90c8b/core/core.js#L69
const debounce = (fn:Callable, ms = 0) => {
  let timeoutId: number;
  return function(...args:any[]) {
     clearTimeout(timeoutId);
    timeoutId = setTimeout(fn, ms, ...args);
  };
};

// FIXED with setInterval
// const debounce = function (fn: Callable, delay = 0) {
//   let id: number;
//   let lastTime: number;

//   function watcher() {
//     if (Date.now() - lastTime > delay) {
//       clearInterval(id);
//       id = 0;
//       fn();
//     }
//   }
//   function debounced(): void {
//     lastTime = Date.now();
//     if (!id) {
//       id = setInterval(watcher, delay);
//     }
//   }
//   return debounced;
// };

const RUNS =
60709; // start failing
60708; // no fails

const runner = () => {
  console.count("run");
  return;
};
const run: Spy = spy(console, "count");

const debounced = debounce(runner, 10);

for (let i = 0; i < RUNS ; i++) {
  debounced()
}
await delay(1000);
assertEquals(run.calls.length, 1);