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import { raf } from './environment.js';
const tasks = new Set();
/**
* @param {number} now
* @returns {void}
*/
function run_tasks(now) {
tasks.forEach((task) => {
if (!task.c(now)) {
tasks.delete(task);
task.f();
}
});
if (tasks.size !== 0) raf(run_tasks);
}
/**
* For testing purposes only!
* @returns {void}
*/
export function clear_loops() {
tasks.clear();
}
/**
* Creates a new task that runs on each raf frame
* until it returns a falsy value or is aborted
* @param {import('./private.js').TaskCallback} callback
* @returns {import('./private.js').Task}
*/
export function loop(callback) {
/** @type {import('./private.js').TaskEntry} */
let task;
if (tasks.size === 0) raf(run_tasks);
return {
promise: new Promise((fulfill) => {
tasks.add((task = { c: callback, f: fulfill }));
}),
abort() {
tasks.delete(task);
}
};
}
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