interface CancelStackCredentials {
    accessKeyId: string;
    secretAccessKey: string;
    sessionToken?: string;
}
/**
 * What a cancel attempt did. `cancelled-update` issued a cancel, and
 * `cancel-unconfirmed` may have: CloudFormation's answer to it was lost.
 * Every other outcome issued none. Each `reason` is masked at construction.
 */
export type CancelInFlightOutcome = {
    readonly kind: "cancelled-update";
} | {
    readonly kind: "create-in-progress";
} | {
    readonly kind: "not-cancellable";
    readonly status: string;
} | {
    readonly kind: "no-stack";
} | {
    readonly kind: "unreadable";
    readonly reason: string;
} | {
    readonly kind: "cancel-refused";
    readonly reason: string;
} | {
    readonly kind: "cancel-unconfirmed";
    readonly reason: string;
};
/**
 * Describe the stack and, if it is mid-update, issue CancelUpdateStack.
 *
 * - `UPDATE_IN_PROGRESS` → CancelUpdateStack (CFN rolls back to last good state).
 * - `CREATE_IN_PROGRESS` → CancelUpdateStack is invalid for a first create; we
 *   leave it (CFN's own create-failure default is rollback, and the next deploy's
 *   stack-cleanup reconciles a ROLLBACK_* stack) and report so the operator can
 *   `fjall destroy <target>` if they want it gone now.
 * - any other status → `not-cancellable` (the op already reached a terminal
 *   or rollback state); no stack → `no-stack` (abort fired before any CFN op).
 * - a status that could not be read → `unreadable`, and a CancelUpdateStack
 *   CloudFormation answered with a refusal → `cancel-refused`; neither issued
 *   a cancel. A CancelUpdateStack whose answer was lost (a transport failure,
 *   a timeout, a 5xx, or a refusal on an attempt the SDK retried) →
 *   `cancel-unconfirmed`, since CloudFormation may have taken it.
 *
 * @param onOutput optional sink for an operator-facing line (already inside the
 *   deploy output stream — caller masks at its own boundary if needed).
 * @param clientRequestToken sent with the CancelUpdateStack, so CloudFormation
 *   recognises a retry of a request it already took, by the SDK or by the
 *   caller, rather than refusing the stack's new status.
 */
export declare function cancelInFlightStack(stackName: string, region: string, credentials?: CancelStackCredentials, onOutput?: (message: string) => void, clientRequestToken?: string): Promise<CancelInFlightOutcome>;
export {};