/**
 * Strip trailing slash, then append `defaultPath` only when the user's URL has
 * no meaningful path of its own.
 *
 * "No meaningful path" = pathname is `""` or `"/"`. If the user wrote
 * `https://api.openai.com/v1` or `http://localhost:8080/openai/v1`, the path
 * is already supplied and we leave it alone — matters for self-hosted OpenAI
 * compatible servers that don't follow the canonical mount point.
 */
export declare function withDefaultPath(baseUrl: string, defaultPath: string): string;
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