export type AttachmentTextOutcome = "extracted" | "no-text-layer" | "unsupported-mime";
export interface AttachmentTextResult {
    outcome: AttachmentTextOutcome;
    /** Extracted text; empty string for no-text-layer and unsupported-mime. */
    text: string;
    mimeType: string;
}
/**
 * Extract readable text from one attachment's already-decoded bytes.
 *
 *  - `application/pdf` → `pdftotext` (poppler-utils). Empty output means the
 *    PDF has no text layer (a scanned image), reported as `no-text-layer`
 *    rather than an empty success so "no data in the PDF" is never
 *    indistinguishable from "the PDF could not be read".
 *  - `text/*` → UTF-8 decode.
 *  - anything else → `unsupported-mime` (no bytes are interpreted).
 *
 * This is the email plugin's own extractor. Plugin isolation forbids importing
 * the memory plugin's copy, so the `pdftotext` pattern is duplicated here.
 */
export declare function extractAttachmentText(bytes: Buffer, mimeType: string): Promise<AttachmentTextResult>;
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