/**
 * Canonical user-id namespace for an externally-issued identity:
 * `'<providerId>:<providerSubject>'`. One definition shared by the
 * OAuth-login routes and the OIDC verify adapter so every consumer
 * computes the same id. Collision-safe vs raw provider subjects that
 * carry no `:` prefix.
 */
export declare function composeOAuthUserId(input: {
    readonly providerId: string;
    readonly providerSubject: string;
}): string;
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