1 | (function (root) {
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2 |
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3 |
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4 |
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5 | var setTimeoutFunc = setTimeout;
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6 |
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7 | function noop() {}
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8 |
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9 |
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10 | function bind(fn, thisArg) {
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11 | return function () {
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12 | fn.apply(thisArg, arguments);
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13 | };
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14 | }
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15 |
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16 | function Promise(fn) {
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17 | if (!(this instanceof Promise)) throw new TypeError('Promises must be constructed via new');
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18 | if (typeof fn !== 'function') throw new TypeError('not a function');
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19 | this._state = 0;
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20 | this._handled = false;
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21 | this._value = undefined;
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22 | this._deferreds = [];
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23 |
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24 | doResolve(fn, this);
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25 | }
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26 |
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27 | function handle(self, deferred) {
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28 | while (self._state === 3) {
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29 | self = self._value;
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30 | }
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31 | if (self._state === 0) {
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32 | self._deferreds.push(deferred);
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33 | return;
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34 | }
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35 | self._handled = true;
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36 | Promise._immediateFn(function () {
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37 | var cb = self._state === 1 ? deferred.onFulfilled : deferred.onRejected;
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38 | if (cb === null) {
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39 | (self._state === 1 ? resolve : reject)(deferred.promise, self._value);
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40 | return;
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41 | }
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42 | var ret;
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43 | try {
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44 | ret = cb(self._value);
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45 | } catch (e) {
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46 | reject(deferred.promise, e);
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47 | return;
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48 | }
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49 | resolve(deferred.promise, ret);
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50 | });
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51 | }
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52 |
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53 | function resolve(self, newValue) {
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54 | try {
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55 |
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56 | if (newValue === self) throw new TypeError('A promise cannot be resolved with itself.');
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57 | if (newValue && (typeof newValue === 'object' || typeof newValue === 'function')) {
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58 | var then = newValue.then;
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59 | if (newValue instanceof Promise) {
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60 | self._state = 3;
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61 | self._value = newValue;
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62 | finale(self);
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63 | return;
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64 | } else if (typeof then === 'function') {
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65 | doResolve(bind(then, newValue), self);
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66 | return;
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67 | }
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68 | }
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69 | self._state = 1;
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70 | self._value = newValue;
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71 | finale(self);
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72 | } catch (e) {
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73 | reject(self, e);
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74 | }
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75 | }
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76 |
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77 | function reject(self, newValue) {
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78 | self._state = 2;
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79 | self._value = newValue;
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80 | finale(self);
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81 | }
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82 |
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83 | function finale(self) {
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84 | if (self._state === 2 && self._deferreds.length === 0) {
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85 | Promise._immediateFn(function() {
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86 | if (!self._handled) {
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87 | Promise._unhandledRejectionFn(self._value);
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88 | }
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89 | });
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90 | }
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91 |
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92 | for (var i = 0, len = self._deferreds.length; i < len; i++) {
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93 | handle(self, self._deferreds[i]);
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94 | }
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95 | self._deferreds = null;
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96 | }
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97 |
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98 | function Handler(onFulfilled, onRejected, promise) {
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99 | this.onFulfilled = typeof onFulfilled === 'function' ? onFulfilled : null;
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100 | this.onRejected = typeof onRejected === 'function' ? onRejected : null;
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101 | this.promise = promise;
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102 | }
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103 |
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104 | |
105 |
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106 |
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107 |
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108 |
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109 |
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110 | function doResolve(fn, self) {
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111 | var done = false;
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112 | try {
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113 | fn(function (value) {
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114 | if (done) return;
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115 | done = true;
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116 | resolve(self, value);
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117 | }, function (reason) {
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118 | if (done) return;
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119 | done = true;
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120 | reject(self, reason);
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121 | });
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122 | } catch (ex) {
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123 | if (done) return;
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124 | done = true;
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125 | reject(self, ex);
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126 | }
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127 | }
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128 |
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129 | Promise.prototype['catch'] = function (onRejected) {
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130 | return this.then(null, onRejected);
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131 | };
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132 |
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133 | Promise.prototype.then = function (onFulfilled, onRejected) {
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134 | var prom = new (this.constructor)(noop);
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135 |
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136 | handle(this, new Handler(onFulfilled, onRejected, prom));
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137 | return prom;
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138 | };
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139 |
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140 | Promise.all = function (arr) {
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141 | return new Promise(function (resolve, reject) {
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142 | if (!arr || typeof arr.length === 'undefined') throw new TypeError('Promise.all accepts an array');
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143 | var args = Array.prototype.slice.call(arr);
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144 | if (args.length === 0) return resolve([]);
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145 | var remaining = args.length;
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146 |
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147 | function res(i, val) {
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148 | try {
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149 | if (val && (typeof val === 'object' || typeof val === 'function')) {
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150 | var then = val.then;
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151 | if (typeof then === 'function') {
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152 | then.call(val, function (val) {
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153 | res(i, val);
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154 | }, reject);
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155 | return;
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156 | }
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157 | }
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158 | args[i] = val;
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159 | if (--remaining === 0) {
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160 | resolve(args);
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161 | }
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162 | } catch (ex) {
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163 | reject(ex);
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164 | }
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165 | }
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166 |
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167 | for (var i = 0; i < args.length; i++) {
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168 | res(i, args[i]);
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169 | }
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170 | });
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171 | };
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172 |
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173 | Promise.resolve = function (value) {
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174 | if (value && typeof value === 'object' && value.constructor === Promise) {
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175 | return value;
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176 | }
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177 |
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178 | return new Promise(function (resolve) {
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179 | resolve(value);
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180 | });
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181 | };
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182 |
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183 | Promise.reject = function (value) {
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184 | return new Promise(function (resolve, reject) {
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185 | reject(value);
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186 | });
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187 | };
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188 |
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189 | Promise.race = function (values) {
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190 | return new Promise(function (resolve, reject) {
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191 | for (var i = 0, len = values.length; i < len; i++) {
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192 | values[i].then(resolve, reject);
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193 | }
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194 | });
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195 | };
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196 |
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197 |
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198 | Promise._immediateFn = (typeof setImmediate === 'function' && function (fn) { setImmediate(fn); }) ||
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199 | function (fn) {
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200 | setTimeoutFunc(fn, 0);
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201 | };
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202 |
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203 | Promise._unhandledRejectionFn = function _unhandledRejectionFn(err) {
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204 | if (typeof console !== 'undefined' && console) {
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205 | console.warn('Possible Unhandled Promise Rejection:', err);
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206 | }
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207 | };
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208 |
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209 | |
210 |
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211 |
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212 |
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213 |
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214 | Promise._setImmediateFn = function _setImmediateFn(fn) {
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215 | Promise._immediateFn = fn;
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216 | };
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217 |
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218 | |
219 |
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220 |
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221 |
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222 |
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223 | Promise._setUnhandledRejectionFn = function _setUnhandledRejectionFn(fn) {
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224 | Promise._unhandledRejectionFn = fn;
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225 | };
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226 |
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227 | if (typeof module !== 'undefined' && module.exports) {
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228 | module.exports = Promise;
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229 | } else if (!root.Promise) {
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230 | root.Promise = Promise;
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231 | }
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232 |
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233 | })(this);
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