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Leetcode 2650. Design Cancellable Function
Run a generator that yields promises and return [cancel, promise] where each yielded promise's resolution or rejection is passed back into the generator via next/throw, and calling cancel() injects the string "Cancelled" as a thrown error to stop further execution. The returned promise should resolve with the generator's final value (or with the next yielded/returned value if a thrown error was caught) or reject with any uncaught error.
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