/**
 * Helpers for resolving the top-level token issuer identifier.
 *
 * During the appId -> apiKey transition, both fields are treated as aliases for
 * the same identifier. The identifier is interpreted as an API key when it uses
 * the publishable key prefix; otherwise it is treated as a legacy appId.
 */
export interface ConnectionIdentityInput {
    appId?: string;
    apiKey?: string;
}
export interface ResolvedConnectionIdentity {
    identifier?: string;
    appId?: string;
    apiKey?: string;
    useAuthorizationHeader: boolean;
}
export declare function looksLikeVowelApiKey(value: string | undefined): boolean;
export declare function resolveConnectionIdentity(input: ConnectionIdentityInput): ResolvedConnectionIdentity;
export declare function getSafeConnectionStoragePrefix(input: ConnectionIdentityInput): string;
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