import { CoreErrorException } from "./types.js";
/**
 * Raised when one event contains the same changed field more than once.
 *
 * A duplicate field would make the event identity ambiguous, so callers must
 * reject or quarantine the observation instead of generating an event key.
 */
export declare class DuplicateChangedFieldError extends CoreErrorException<"event_identity", "duplicate_changed_field"> {
    readonly fieldName: string;
    constructor(fieldName: string);
}
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