/**
 * companion-chat-attachments.ts
 *
 * Pure attachment-resolution + provider-content helpers for CompanionChatManager.
 * Extracted so the manager file stays within its line budget; behaviour is
 * unchanged, every function takes the artifact store explicitly instead of
 * reaching through `this`.
 */
import { Buffer } from 'node:buffer';
import type { ContentPart } from '../providers/interface.js';
import type { ArtifactDescriptor } from '../artifacts/index.js';
import type { CompanionChatMessageAttachment, CompanionChatMessageAttachmentInput, CompanionChatMessage } from './companion-chat-types.js';
export declare const MAX_ATTACHMENTS_PER_MESSAGE = 8;
export interface CompanionChatArtifactStore {
    get(artifactId: string): ArtifactDescriptor | null;
    readContent(artifactId: string): Promise<{
        readonly record: {
            readonly mimeType: string;
            readonly filename?: string | undefined;
        };
        readonly buffer: ArrayBuffer | Uint8Array | Buffer;
    }>;
}
export declare function toNodeBuffer(buffer: ArrayBuffer | Uint8Array | Buffer): Buffer;
export declare function resolveAttachments(inputs: readonly CompanionChatMessageAttachmentInput[], artifactStore: CompanionChatArtifactStore | null): CompanionChatMessageAttachment[];
export declare function formatAttachmentSummary(attachments: readonly CompanionChatMessageAttachment[]): string;
export declare function buildReplayUserContent(message: CompanionChatMessage): string;
export declare function buildProviderUserContent(content: string, attachments: readonly CompanionChatMessageAttachment[], artifactStore: CompanionChatArtifactStore | null): Promise<string | ContentPart[]>;
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