import type { gmail_v1 } from "googleapis";
export interface ParsedAttachment {
    readonly filename: string;
    readonly mime_type: string;
    readonly size: number;
    readonly attachment_id: string;
}
export interface ParsedHeaders {
    readonly from: string;
    readonly to: string;
    readonly cc: string;
    readonly bcc: string;
    readonly subject: string;
    readonly date: string;
    readonly message_id: string;
    readonly reply_to: string;
}
export declare function decodeBase64Url(data: string): string;
export declare function extractHeaders(payload: gmail_v1.Schema$MessagePart | undefined): ParsedHeaders;
export interface ExtractedBody {
    readonly text: string;
    readonly html: string;
    readonly attachments: ReadonlyArray<ParsedAttachment>;
}
export declare function extractBody(payload: gmail_v1.Schema$MessagePart | undefined): ExtractedBody;
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