1 | "use strict";
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17 | Object.defineProperty(exports, "__esModule", { value: true });
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18 | exports.AsyncEmitter = exports.WaitUntilEvent = exports.Emitter = exports.Event = void 0;
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19 |
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20 | const disposable_1 = require("./disposable");
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21 | var Event;
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22 | (function (Event) {
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23 | const _disposable = { dispose() { } };
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24 | function getMaxListeners(event) {
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25 | const { maxListeners } = event;
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26 | return typeof maxListeners === 'number' ? maxListeners : 0;
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27 | }
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28 | Event.getMaxListeners = getMaxListeners;
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29 | function setMaxListeners(event, maxListeners) {
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30 | if (typeof event.maxListeners === 'number') {
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31 | return event.maxListeners = maxListeners;
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32 | }
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33 | return maxListeners;
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34 | }
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35 | Event.setMaxListeners = setMaxListeners;
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36 | function addMaxListeners(event, add) {
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37 | if (typeof event.maxListeners === 'number') {
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38 | return event.maxListeners += add;
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39 | }
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40 | return add;
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41 | }
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42 | Event.addMaxListeners = addMaxListeners;
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43 | Event.None = Object.assign(function () { return _disposable; }, {
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44 | get maxListeners() { return 0; },
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45 | set maxListeners(maxListeners) { }
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46 | });
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47 | |
48 |
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49 |
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50 | function once(event) {
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51 | return (listener, thisArgs = undefined, disposables) => {
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52 |
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53 | let didFire = false;
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54 | let result = undefined;
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55 | result = event(e => {
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56 | if (didFire) {
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57 | return;
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58 | }
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59 | else if (result) {
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60 | result.dispose();
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61 | }
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62 | else {
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63 | didFire = true;
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64 | }
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65 | return listener.call(thisArgs, e);
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66 | }, undefined, disposables);
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67 | if (didFire) {
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68 | result.dispose();
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69 | }
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70 | return result;
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71 | };
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72 | }
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73 | Event.once = once;
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74 | function toPromise(event) {
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75 | return new Promise(resolve => once(event)(resolve));
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76 | }
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77 | Event.toPromise = toPromise;
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78 | |
79 |
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80 |
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81 |
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82 | function map(event, mapFunc) {
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83 | return Object.assign((listener, thisArgs, disposables) => event(i => listener.call(thisArgs, mapFunc(i)), undefined, disposables), {
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84 | get maxListeners() { return 0; },
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85 | set maxListeners(maxListeners) { }
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86 | });
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87 | }
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88 | Event.map = map;
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89 | function any(...events) {
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90 | return (listener, thisArgs = undefined, disposables) => new disposable_1.DisposableCollection(...events.map(event => event(e => listener.call(thisArgs, e), undefined, disposables)));
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91 | }
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92 | Event.any = any;
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93 | })(Event = exports.Event || (exports.Event = {}));
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94 | class CallbackList {
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95 | get length() {
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96 | return this._callbacks && this._callbacks.length || 0;
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97 | }
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98 | add(callback, context = undefined, bucket) {
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99 | if (!this._callbacks) {
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100 | this._callbacks = [];
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101 | this._contexts = [];
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102 | }
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103 | this._callbacks.push(callback);
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104 | this._contexts.push(context);
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105 | if (Array.isArray(bucket)) {
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106 | bucket.push({ dispose: () => this.remove(callback, context) });
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107 | }
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108 | }
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109 | remove(callback, context = undefined) {
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110 | if (!this._callbacks) {
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111 | return;
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112 | }
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113 | let foundCallbackWithDifferentContext = false;
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114 | for (let i = 0; i < this._callbacks.length; i++) {
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115 | if (this._callbacks[i] === callback) {
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116 | if (this._contexts[i] === context) {
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117 |
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118 | this._callbacks.splice(i, 1);
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119 | this._contexts.splice(i, 1);
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120 | return;
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121 | }
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122 | else {
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123 | foundCallbackWithDifferentContext = true;
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124 | }
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125 | }
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126 | }
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127 | if (foundCallbackWithDifferentContext) {
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128 | throw new Error('When adding a listener with a context, you should remove it with the same context');
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129 | }
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130 | }
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131 |
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132 | [Symbol.iterator]() {
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133 | if (!this._callbacks) {
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134 | return [][Symbol.iterator]();
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135 | }
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136 | const callbacks = this._callbacks.slice(0);
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137 | const contexts = this._contexts.slice(0);
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138 | return callbacks.map((callback, i) => (...args) => callback.apply(contexts[i], args))[Symbol.iterator]();
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139 | }
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140 | invoke(...args) {
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141 | const ret = [];
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142 | for (const callback of this) {
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143 | try {
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144 | ret.push(callback(...args));
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145 | }
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146 | catch (e) {
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147 | console.error(e);
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148 | }
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149 | }
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150 | return ret;
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151 | }
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152 | isEmpty() {
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153 | return !this._callbacks || this._callbacks.length === 0;
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154 | }
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155 | dispose() {
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156 | this._callbacks = undefined;
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157 | this._contexts = undefined;
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158 | }
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159 | }
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160 | class Emitter {
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161 | constructor(_options) {
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162 | this._options = _options;
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163 | this._disposed = false;
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164 | this._leakWarnCountdown = 0;
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165 | }
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166 | |
167 |
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168 |
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169 |
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170 | get event() {
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171 | if (!this._event) {
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172 | this._event = Object.assign((listener, thisArgs, disposables) => {
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173 | if (!this._callbacks) {
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174 | this._callbacks = new CallbackList();
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175 | }
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176 | if (this._options && this._options.onFirstListenerAdd && this._callbacks.isEmpty()) {
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177 | this._options.onFirstListenerAdd(this);
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178 | }
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179 | this._callbacks.add(listener, thisArgs);
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180 | const removeMaxListenersCheck = this.checkMaxListeners(Event.getMaxListeners(this._event));
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181 | const result = {
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182 | dispose: () => {
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183 | if (removeMaxListenersCheck) {
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184 | removeMaxListenersCheck();
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185 | }
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186 | result.dispose = Emitter._noop;
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187 | if (!this._disposed) {
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188 | this._callbacks.remove(listener, thisArgs);
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189 | result.dispose = Emitter._noop;
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190 | if (this._options && this._options.onLastListenerRemove && this._callbacks.isEmpty()) {
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191 | this._options.onLastListenerRemove(this);
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192 | }
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193 | }
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194 | }
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195 | };
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196 | if (disposable_1.DisposableGroup.canPush(disposables)) {
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197 | disposables.push(result);
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198 | }
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199 | else if (disposable_1.DisposableGroup.canAdd(disposables)) {
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200 | disposables.add(result);
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201 | }
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202 | return result;
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203 | }, {
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204 | maxListeners: Emitter.LEAK_WARNING_THRESHHOLD
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205 | });
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206 | }
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207 | return this._event;
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208 | }
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209 | checkMaxListeners(maxListeners) {
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210 | if (maxListeners === 0 || !this._callbacks) {
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211 | return undefined;
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212 | }
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213 | const listenerCount = this._callbacks.length;
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214 | if (listenerCount <= maxListeners) {
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215 | return undefined;
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216 | }
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217 | const popStack = this.pushLeakingStack();
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218 | this._leakWarnCountdown -= 1;
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219 | if (this._leakWarnCountdown <= 0) {
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220 |
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221 |
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222 | this._leakWarnCountdown = maxListeners * 0.5;
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223 | let topStack;
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224 | let topCount = 0;
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225 | this._leakingStacks.forEach((stackCount, stack) => {
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226 | if (!topStack || topCount < stackCount) {
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227 | topStack = stack;
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228 | topCount = stackCount;
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229 | }
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230 | });
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231 |
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232 | console.warn(`Possible Emitter memory leak detected. ${listenerCount} listeners added. Use event.maxListeners to increase the limit (${maxListeners}). MOST frequent listener (${topCount}):`);
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233 | console.warn(topStack);
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234 | }
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235 | return popStack;
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236 | }
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237 | pushLeakingStack() {
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238 | if (!this._leakingStacks) {
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239 | this._leakingStacks = new Map();
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240 | }
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241 | const stack = new Error().stack.split('\n').slice(3).join('\n');
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242 | const count = (this._leakingStacks.get(stack) || 0);
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243 | this._leakingStacks.set(stack, count + 1);
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244 | return () => this.popLeakingStack(stack);
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245 | }
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246 | popLeakingStack(stack) {
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247 | if (!this._leakingStacks) {
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248 | return;
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249 | }
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250 | const count = (this._leakingStacks.get(stack) || 0);
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251 | this._leakingStacks.set(stack, count - 1);
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252 | }
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253 | |
254 |
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255 |
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256 |
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257 | fire(event) {
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258 | if (this._callbacks) {
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259 | return this._callbacks.invoke(event);
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260 | }
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261 | }
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262 | |
263 |
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264 |
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265 |
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266 | async sequence(processor) {
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267 | if (this._callbacks) {
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268 | for (const listener of this._callbacks) {
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269 | if (!await processor(listener)) {
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270 | break;
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271 | }
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272 | }
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273 | }
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274 | }
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275 | dispose() {
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276 | if (this._leakingStacks) {
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277 | this._leakingStacks.clear();
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278 | this._leakingStacks = undefined;
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279 | }
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280 | if (this._callbacks) {
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281 | this._callbacks.dispose();
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282 | this._callbacks = undefined;
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283 | }
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284 | this._disposed = true;
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285 | }
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286 | }
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287 | exports.Emitter = Emitter;
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288 | Emitter.LEAK_WARNING_THRESHHOLD = 175;
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289 | Emitter._noop = function () { };
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290 | var WaitUntilEvent;
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291 | (function (WaitUntilEvent) {
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292 | |
293 |
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294 |
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295 |
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296 |
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297 | async function fire(emitter, event, timeout, token = cancellation_1.CancellationToken.None) {
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298 | const waitables = [];
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299 | const asyncEvent = Object.assign(event, {
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300 | token,
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301 | waitUntil: (thenable) => {
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302 | if (Object.isFrozen(waitables)) {
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303 | throw new Error('waitUntil cannot be called asynchronously.');
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304 | }
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305 | waitables.push(thenable);
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306 | }
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307 | });
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308 | try {
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309 | emitter.fire(asyncEvent);
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310 |
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311 | Object.freeze(waitables);
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312 | }
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313 | finally {
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314 | delete asyncEvent['waitUntil'];
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315 | }
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316 | if (!waitables.length) {
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317 | return;
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318 | }
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319 | if (timeout !== undefined) {
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320 | await Promise.race([Promise.all(waitables), new Promise(resolve => setTimeout(resolve, timeout))]);
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321 | }
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322 | else {
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323 | await Promise.all(waitables);
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324 | }
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325 | }
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326 | WaitUntilEvent.fire = fire;
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327 | })(WaitUntilEvent = exports.WaitUntilEvent || (exports.WaitUntilEvent = {}));
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328 | const cancellation_1 = require("./cancellation");
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329 | class AsyncEmitter extends Emitter {
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330 | |
331 |
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332 |
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333 | fire(event, token = cancellation_1.CancellationToken.None, promiseJoin) {
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334 | const callbacks = this._callbacks;
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335 | if (!callbacks) {
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336 | return Promise.resolve();
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337 | }
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338 | const listeners = [...callbacks];
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339 | if (this.deliveryQueue) {
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340 | return this.deliveryQueue = this.deliveryQueue.then(() => this.deliver(listeners, event, token, promiseJoin));
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341 | }
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342 | return this.deliveryQueue = this.deliver(listeners, event, token, promiseJoin);
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343 | }
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344 | async deliver(listeners, event, token, promiseJoin) {
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345 | for (const listener of listeners) {
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346 | if (token.isCancellationRequested) {
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347 | return;
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348 | }
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349 | const waitables = [];
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350 | const asyncEvent = Object.assign(event, {
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351 | token,
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352 | waitUntil: (thenable) => {
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353 | if (Object.isFrozen(waitables)) {
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354 | throw new Error('waitUntil cannot be called asynchronously.');
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355 | }
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356 | if (promiseJoin) {
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357 | thenable = promiseJoin(thenable, listener);
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358 | }
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359 | waitables.push(thenable);
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360 | }
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361 | });
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362 | try {
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363 | listener(event);
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364 |
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365 | Object.freeze(waitables);
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366 | }
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367 | catch (e) {
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368 | console.error(e);
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369 | }
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370 | finally {
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371 | delete asyncEvent['waitUntil'];
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372 | }
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373 | if (!waitables.length) {
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374 | return;
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375 | }
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376 | try {
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377 | await Promise.all(waitables);
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378 | }
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379 | catch (e) {
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380 | console.error(e);
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381 | }
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382 | }
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383 | }
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384 | }
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385 | exports.AsyncEmitter = AsyncEmitter;
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386 |
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