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81 lines
2.3 KiB
81 lines
2.3 KiB
'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = reflect;
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var _initialParams = require('./internal/initialParams');
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var _initialParams2 = _interopRequireDefault(_initialParams);
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var _slice = require('./internal/slice');
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var _slice2 = _interopRequireDefault(_slice);
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var _wrapAsync = require('./internal/wrapAsync');
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var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Wraps the async function in another function that always completes with a
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* result object, even when it errors.
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*
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* The result object has either the property `error` or `value`.
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*
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* @name reflect
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* @static
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* @memberOf module:Utils
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* @method
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* @category Util
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* @param {AsyncFunction} fn - The async function you want to wrap
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* @returns {Function} - A function that always passes null to it's callback as
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* the error. The second argument to the callback will be an `object` with
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* either an `error` or a `value` property.
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* @example
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*
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* async.parallel([
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* async.reflect(function(callback) {
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* // do some stuff ...
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* callback(null, 'one');
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* }),
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* async.reflect(function(callback) {
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* // do some more stuff but error ...
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* callback('bad stuff happened');
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* }),
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* async.reflect(function(callback) {
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* // do some more stuff ...
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* callback(null, 'two');
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* })
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* ],
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* // optional callback
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* function(err, results) {
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* // values
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* // results[0].value = 'one'
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* // results[1].error = 'bad stuff happened'
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* // results[2].value = 'two'
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* });
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*/
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function reflect(fn) {
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var _fn = (0, _wrapAsync2.default)(fn);
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return (0, _initialParams2.default)(function reflectOn(args, reflectCallback) {
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args.push(function callback(error, cbArg) {
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if (error) {
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reflectCallback(null, { error: error });
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} else {
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var value;
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if (arguments.length <= 2) {
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value = cbArg;
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} else {
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value = (0, _slice2.default)(arguments, 1);
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}
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reflectCallback(null, { value: value });
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}
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});
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return _fn.apply(this, args);
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});
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}
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module.exports = exports['default'];
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