/** Symbol key for accessing a thread's error observable. */
export declare const $errors: unique symbol;
/** Symbol key for accessing a thread's event observable. */
export declare const $events: unique symbol;
/** Symbol key for accessing a thread's terminate function. */
export declare const $terminate: unique symbol;
/** Symbol key for marking an object as a transferable descriptor. */
export declare const $transferable: unique symbol;
/** Symbol key for accessing the underlying worker instance of a thread. */
export declare const $worker: unique symbol;
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