import { type ChatUiMessage, type FileUIPartWithUpload } from "../../chat/types.js";
/** Input payload for runtime file URL resolver. */
export type RuntimeFileUrlResolverInput = {
    uploadId: string;
    part: FileUIPartWithUpload;
    message: ChatUiMessage;
};
/** Public API contract for runtime file URL resolver. */
export type RuntimeFileUrlResolver = (input: RuntimeFileUrlResolverInput) => Promise<string | undefined>;
/** Input payload for runtime file content fetcher. */
export type RuntimeFileContentFetcherInput = {
    url: string;
    mediaType: string;
    filename?: string;
    uploadId?: string;
    uploadPath?: string;
    abortSignal?: AbortSignal;
    timeoutMs?: number;
    part: FileUIPartWithUpload;
    message: ChatUiMessage;
};
/** Public API contract for runtime file content fetcher. */
export type RuntimeFileContentFetcher = (input: RuntimeFileContentFetcherInput) => Promise<string | undefined>;
/** Creates a safe runtime file content fetcher. */
export declare function createRuntimeFileContentFetcher(options?: {
    trustedUrls?: ReadonlySet<string>;
    abortSignal?: AbortSignal;
    timeoutMs?: number;
}): RuntimeFileContentFetcher;
/** Resolves runtime message file urls. */
export declare function resolveRuntimeMessageFileUrls(messages: readonly ChatUiMessage[], resolveFileUrl: RuntimeFileUrlResolver): Promise<ChatUiMessage[]>;
/** Fetches text attachment bodies and adds them as adjacent text parts. */
export declare function inlineRuntimeMessageFileContents(messages: readonly ChatUiMessage[], fetchFileContent?: RuntimeFileContentFetcher, options?: {
    abortSignal?: AbortSignal;
    fetchTimeoutMs?: number;
}): Promise<ChatUiMessage[]>;
/** Composes abort signals manually for runtimes without AbortSignal.any (Node < 20.3). */
export declare function composeAbortSignals(signals: readonly AbortSignal[]): AbortSignal;
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