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Diffstat (limited to 'node_modules/async/ensureAsync.js')
-rw-r--r-- | node_modules/async/ensureAsync.js | 69 |
1 files changed, 0 insertions, 69 deletions
diff --git a/node_modules/async/ensureAsync.js b/node_modules/async/ensureAsync.js deleted file mode 100644 index 08e08296f..000000000 --- a/node_modules/async/ensureAsync.js +++ /dev/null @@ -1,69 +0,0 @@ -'use strict'; - -Object.defineProperty(exports, "__esModule", { - value: true -}); -exports.default = ensureAsync; - -var _setImmediate = require('./internal/setImmediate'); - -var _setImmediate2 = _interopRequireDefault(_setImmediate); - -var _initialParams = require('./internal/initialParams'); - -var _initialParams2 = _interopRequireDefault(_initialParams); - -function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } - -/** - * Wrap an async function and ensure it calls its callback on a later tick of - * the event loop. If the function already calls its callback on a next tick, - * no extra deferral is added. This is useful for preventing stack overflows - * (`RangeError: Maximum call stack size exceeded`) and generally keeping - * [Zalgo](http://blog.izs.me/post/59142742143/designing-apis-for-asynchrony) - * contained. - * - * @name ensureAsync - * @static - * @memberOf module:Utils - * @method - * @category Util - * @param {Function} fn - an async function, one that expects a node-style - * callback as its last argument. - * @returns {Function} Returns a wrapped function with the exact same call - * signature as the function passed in. - * @example - * - * function sometimesAsync(arg, callback) { - * if (cache[arg]) { - * return callback(null, cache[arg]); // this would be synchronous!! - * } else { - * doSomeIO(arg, callback); // this IO would be asynchronous - * } - * } - * - * // this has a risk of stack overflows if many results are cached in a row - * async.mapSeries(args, sometimesAsync, done); - * - * // this will defer sometimesAsync's callback if necessary, - * // preventing stack overflows - * async.mapSeries(args, async.ensureAsync(sometimesAsync), done); - */ -function ensureAsync(fn) { - return (0, _initialParams2.default)(function (args, callback) { - var sync = true; - args.push(function () { - var innerArgs = arguments; - if (sync) { - (0, _setImmediate2.default)(function () { - callback.apply(null, innerArgs); - }); - } else { - callback.apply(null, innerArgs); - } - }); - fn.apply(this, args); - sync = false; - }); -} -module.exports = exports['default'];
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