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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 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