/**
 * Stable, machine-readable codes for OIDC state / nonce failures occurring
 * between the authorization redirect and the callback handling.
 *
 * These codes let consumers react to specific failure modes without having to
 * pattern-match against error message strings.
 */
export declare const OidcStateErrorCode: {
    /** No state was found in storage when handling the callback. */
    readonly STATE_MISSING: "STATE_MISSING";
    /** The state returned by the server does not match the stored one. */
    readonly STATE_MISMATCH: "STATE_MISMATCH";
    /** No nonce was found in storage when handling the callback / renewal. */
    readonly NONCE_MISSING: "NONCE_MISSING";
};
export type OidcStateErrorCode = (typeof OidcStateErrorCode)[keyof typeof OidcStateErrorCode];
/**
 * Typed error thrown when the OIDC login state or nonce is missing,
 * corrupted, or does not match the value returned by the authorization server.
 *
 * Consumers can use `instanceof OidcStateError` and inspect `code` instead of
 * relying on the (unstable) error message text.
 */
export declare class OidcStateError extends Error {
    readonly code: OidcStateErrorCode;
    constructor(code: OidcStateErrorCode, message: string);
}
/**
 * Type guard for {@link OidcStateError}. Useful in callers that want to react
 * specifically to state/nonce failures.
 */
export declare const isOidcStateError: (value: unknown) => value is OidcStateError;
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