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Call AbortSignal.none to create a new AbortSignal instance that cannot be cancelled.\n * Use `AbortSignal.none` when you are required to pass a cancellation token but the operation\n * cannot or will not ever be cancelled.\n *\n * @example\n * Abort without timeout\n * ```ts\n * await doAsyncWork(AbortSignal.none);\n * ```\n */\nexport class AbortSignal implements AbortSignalLike {\n constructor() {\n listenersMap.set(this, []);\n abortedMap.set(this, false);\n }\n\n /**\n * Status of whether aborted or not.\n *\n * @readonly\n */\n public get aborted(): boolean {\n if (!abortedMap.has(this)) {\n throw new TypeError(\"Expected `this` to be an instance of AbortSignal.\");\n }\n\n return abortedMap.get(this)!;\n }\n\n /**\n * Creates a new AbortSignal instance that will never be aborted.\n *\n * @readonly\n */\n public static get none(): AbortSignal {\n return new AbortSignal();\n }\n\n /**\n * onabort event listener.\n */\n public onabort: ((ev?: Event) => any) | null = null;\n\n /**\n * Added new \"abort\" event listener, only support \"abort\" event.\n *\n * @param _type - Only support \"abort\" event\n * @param listener - The listener to be added\n */\n public addEventListener(\n // tslint:disable-next-line:variable-name\n _type: \"abort\",\n listener: (this: AbortSignalLike, ev: any) => any\n ): void {\n if (!listenersMap.has(this)) {\n throw new TypeError(\"Expected `this` to be an instance of AbortSignal.\");\n }\n\n const listeners = listenersMap.get(this)!;\n listeners.push(listener);\n }\n\n /**\n * Remove \"abort\" event listener, only support \"abort\" event.\n *\n * @param _type - Only support \"abort\" event\n * @param listener - The listener to be removed\n */\n public removeEventListener(\n // tslint:disable-next-line:variable-name\n _type: \"abort\",\n listener: (this: AbortSignalLike, ev: any) => any\n ): void {\n if (!listenersMap.has(this)) {\n throw new TypeError(\"Expected `this` to be an instance of AbortSignal.\");\n }\n\n const listeners = listenersMap.get(this)!;\n\n const index = listeners.indexOf(listener);\n if (index > -1) {\n listeners.splice(index, 1);\n }\n }\n\n /**\n * Dispatches a synthetic event to the AbortSignal.\n */\n dispatchEvent(_event: Event): boolean {\n throw new Error(\n \"This is a stub dispatchEvent implementation that should not be used. It only exists for type-checking purposes.\"\n );\n }\n}\n\n/**\n * Helper to trigger an abort event immediately, the onabort and all abort event listeners will be triggered.\n * Will try to trigger abort event for all linked AbortSignal nodes.\n *\n * - If there is a timeout, the timer will be cancelled.\n * - If aborted is true, nothing will happen.\n *\n * @internal\n */\n// eslint-disable-next-line @azure/azure-sdk/ts-use-interface-parameters\nexport function abortSignal(signal: AbortSignal): void {\n if (signal.aborted) {\n return;\n }\n\n if (signal.onabort) {\n signal.onabort.call(signal);\n }\n\n const listeners = listenersMap.get(signal)!;\n if (listeners) {\n // Create a copy of listeners so mutations to the array\n // (e.g. via removeListener calls) don't affect the listeners\n // we invoke.\n listeners.slice().forEach((listener) => {\n listener.call(signal, { type: \"abort\" });\n });\n }\n\n abortedMap.set(signal, true);\n}\n"]}