@beisen/ethos/lib/es6-promise-debounce/index.js

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"use strict";

(function () {

    "use strict";

    exports.Promise = require('es6-promise').Promise;
    module.exports = function (func, wait, immediate) {

        var timeout;
        return function () {

            var context = this,
                args = arguments;

            return new exports.Promise(function (resolve) {
                var later = function later() {
                    timeout = null;
                    if (!immediate) resolve(func.apply(context, args));
                };

                var callNow = immediate && !timeout;
                clearTimeout(timeout);
                timeout = setTimeout(later, wait);

                if (callNow) resolve(func.apply(context, args));
            });
        };
    };
})();