nextTick.js

'use strict';

import { hasNextTick, hasSetImmediate, fallback, wrap }  from './internal/setImmediate';

/**
 * Calls `callback` on a later loop around the event loop. In Node.js this just
 * calls `process.nextTicl`.  In the browser it will use `setImmediate` if
 * available, otherwise `setTimeout(callback, 0)`, which means other higher
 * priority events may precede the execution of `callback`.
 *
 * This is used internally for browser-compatibility purposes.
 *
 * @name nextTick
 * @static
 * @memberOf module:Utils
 * @method
 * @see [async.setImmediate]{@link module:Utils.setImmediate}
 * @category Util
 * @param {Function} callback - The function to call on a later loop around
 * the event loop. Invoked with (args...).
 * @param {...*} args... - any number of additional arguments to pass to the
 * callback on the next tick.
 * @example
 *
 * var call_order = [];
 * async.nextTick(function() {
 *     call_order.push('two');
 *     // call_order now equals ['one','two']
 * });
 * call_order.push('one');
 *
 * async.setImmediate(function (a, b, c) {
 *     // a, b, and c equal 1, 2, and 3
 * }, 1, 2, 3);
 */
var _defer;

if (hasNextTick) {
    _defer = process.nextTick;
} else if (hasSetImmediate) {
    _defer = setImmediate;
} else {
    _defer = fallback;
}

export default wrap(_defer);