/**
 * Validate the optional public API base URL accepted by the stdio entrypoint.
 *
 * The returned base is canonical and always ends in `/v1`. Validation happens
 * before a FrihetClient is constructed, so an API key cannot be sent to an
 * attacker-controlled origin through the public environment override.
 */
export declare function normalizePublicApiBaseUrl(value: string): string;
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