import type { gmail_v1 } from 'googleapis';
import { type AttachmentMeta, type Message, type MessageBody } from '@fluxmail/core';
export declare function decodeBase64Url(data: string): Buffer;
export declare function encodeBase64Url(data: Buffer): string;
export declare function decodeTextPart(part: gmail_v1.Schema$MessagePart, encoded?: string): string;
type BodyField = 'text' | 'html';
export interface ExternalBodyPart {
    attachmentId: string;
    part: gmail_v1.Schema$MessagePart;
}
export type ExternalBodyParts = Partial<Record<BodyField, ExternalBodyPart>>;
interface WalkedParts {
    body: MessageBody;
    attachments: AttachmentMeta[];
    externalBodyParts: ExternalBodyParts;
}
interface ParsedAttachment {
    meta: AttachmentMeta;
    content?: Buffer;
    /** Gmail's opaque ID from the current message response. */
    providerAttachmentId?: string;
}
/** Walk the MIME tree collecting the preferred text/html bodies and attachment metadata. */
export declare function walkParts(payload: gmail_v1.Schema$MessagePart | undefined): WalkedParts;
export declare function findAttachment(payload: gmail_v1.Schema$MessagePart | undefined, attachmentId: string): ParsedAttachment | undefined;
export interface ParseContext {
    accountId: string;
    /** Gmail label id -> display name, for translating labelIds. */
    labelNames: Map<string, string>;
    includeBody: boolean;
    /** Set only when the Gmail response includes the MIME payload. */
    includeAttachments?: boolean;
    includeHeaders?: boolean;
}
export declare function parseGmailMessage(msg: gmail_v1.Schema$Message, ctx: ParseContext): Message;
export declare function parseGmailMessageWithParts(msg: gmail_v1.Schema$Message, ctx: ParseContext): {
    message: Message;
    externalBodyParts: ExternalBodyParts;
};
export {};
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