__slice.js

Array.prototype.slice.call(
    (Object.prototype.toString.call(source) !== "[object Array]") ? (_a = source.toString().split("")) : (_a = source),
    (typeof from !== "undefined" && from !== null) ? from < 0 ? (from = from + _a.length) < 0 ? 0 : from : from : 0,
    (typeof to !== "undefined" && to !== null) ? (to = to < 0 ? to + _a.length : to) < 0 ? (to = from) : to > _a.length ? (to = _a.length) : to : _a.length
);