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(<any>globalMessageHandler).instance;\n if (event.source === root &&\n typeof event.data === 'string' &&\n event.data.indexOf(messagePrefix) === 0) {\n instance.runIfPresent(+event.data.slice(messagePrefix.length));\n }\n };\n (<any>onGlobalMessage).instance = this;\n\n root.addEventListener('message', onGlobalMessage, false);\n\n let fn = function setImmediate() {\n const { messagePrefix, instance } = (<any>setImmediate);\n let handle = instance.addFromSetImmediateArguments(arguments);\n instance.root.postMessage(messagePrefix + handle, '*');\n return handle;\n };\n\n (<any>fn).instance = this;\n (<any>fn).messagePrefix = messagePrefix;\n\n return fn;\n }\n\n runIfPresent(handle: any) {\n // From the spec: 'Wait until any invocations of this algorithm started before this one have completed.'\n // So if we're currently running a task, we'll need to delay this invocation.\n if (this.currentlyRunningATask) {\n // Delay by doing a setTimeout. setImmediate was tried instead, but in Firefox 7 it generated a\n // 'too much recursion' error.\n this.root.setTimeout(this.partiallyApplied(this.runIfPresent, handle), 0);\n } else {\n let task = this.tasksByHandle[handle];\n if (task) {\n this.currentlyRunningATask = true;\n try {\n task();\n } finally {\n this.clearImmediate(handle);\n this.currentlyRunningATask = false;\n }\n }\n }\n }\n\n createMessageChannelSetImmediate() {\n let channel = new this.root.MessageChannel();\n channel.port1.onmessage = (event: any) => {\n let handle = event.data;\n this.runIfPresent(handle);\n };\n\n let fn = function setImmediate() {\n const { channel, instance } = (<any>setImmediate);\n let handle = instance.addFromSetImmediateArguments(arguments);\n channel.port2.postMessage(handle);\n return handle;\n };\n\n (<any>fn).channel = channel;\n (<any>fn).instance = this;\n\n return fn;\n }\n\n createReadyStateChangeSetImmediate() {\n let fn = function setImmediate() {\n const instance = (<any>setImmediate).instance;\n const root = instance.root;\n 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