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@langchain/openai

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type HeaderValue = string | undefined | null; export type HeadersLike = Headers | readonly HeaderValue[][] | Record<string, HeaderValue | readonly HeaderValue[]> | undefined | null | { values: Headers; [key: string]: unknown; }; export declare function isHeaders(headers: unknown): headers is Headers; export declare function normalizeHeaders(headers: HeadersLike): Record<string, HeaderValue | readonly HeaderValue[]>; export {};