1 | ;
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2 |
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3 | Object.defineProperty(exports, "__esModule", {
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4 | value: true
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5 | });
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6 | exports.default = reflect;
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7 |
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8 | var _initialParams = require('./internal/initialParams');
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9 |
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10 | var _initialParams2 = _interopRequireDefault(_initialParams);
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11 |
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12 | var _slice = require('./internal/slice');
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13 |
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14 | var _slice2 = _interopRequireDefault(_slice);
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15 |
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16 | var _wrapAsync = require('./internal/wrapAsync');
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17 |
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18 | var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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19 |
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20 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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21 |
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22 | /**
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23 | * Wraps the async function in another function that always completes with a
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24 | * result object, even when it errors.
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25 | *
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26 | * The result object has either the property `error` or `value`.
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27 | *
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28 | * @name reflect
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29 | * @static
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30 | * @memberOf module:Utils
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31 | * @method
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32 | * @category Util
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33 | * @param {AsyncFunction} fn - The async function you want to wrap
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34 | * @returns {Function} - A function that always passes null to it's callback as
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35 | * the error. The second argument to the callback will be an `object` with
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36 | * either an `error` or a `value` property.
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37 | * @example
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38 | *
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39 | * async.parallel([
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40 | * async.reflect(function(callback) {
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41 | * // do some stuff ...
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42 | * callback(null, 'one');
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43 | * }),
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44 | * async.reflect(function(callback) {
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45 | * // do some more stuff but error ...
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46 | * callback('bad stuff happened');
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47 | * }),
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48 | * async.reflect(function(callback) {
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49 | * // do some more stuff ...
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50 | * callback(null, 'two');
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51 | * })
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52 | * ],
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53 | * // optional callback
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54 | * function(err, results) {
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55 | * // values
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56 | * // results[0].value = 'one'
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57 | * // results[1].error = 'bad stuff happened'
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58 | * // results[2].value = 'two'
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59 | * });
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60 | */
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61 | function reflect(fn) {
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62 | var _fn = (0, _wrapAsync2.default)(fn);
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63 | return (0, _initialParams2.default)(function reflectOn(args, reflectCallback) {
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64 | args.push(function callback(error, cbArg) {
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65 | if (error) {
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66 | reflectCallback(null, { error: error });
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67 | } else {
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68 | var value;
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69 | if (arguments.length <= 2) {
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70 | value = cbArg;
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71 | } else {
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72 | value = (0, _slice2.default)(arguments, 1);
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73 | }
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74 | reflectCallback(null, { value: value });
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75 | }
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76 | });
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77 |
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78 | return _fn.apply(this, args);
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79 | });
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80 | }
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81 | module.exports = exports['default']; |
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