instantsearch.js/cjs/lib/utils/defer.js

InstantSearch.js is a JavaScript library for building performant and instant search experiences with Algolia.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
var nextMicroTask = Promise.resolve();

var defer = function defer(callback) {
  var progress = null;
  var cancelled = false;

  var fn = function fn() {
    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
      args[_key] = arguments[_key];
    }

    if (progress !== null) {
      return;
    }

    progress = nextMicroTask.then(function () {
      progress = null;

      if (cancelled) {
        cancelled = false;
        return;
      }

      callback.apply(void 0, args);
    });
  };

  fn.wait = function () {
    if (progress === null) {
      throw new Error('The deferred function should be called before calling `wait()`');
    }

    return progress;
  };

  fn.cancel = function () {
    if (progress === null) {
      return;
    }

    cancelled = true;
  };

  return fn;
};

var _default = defer;
exports.default = _default;