/** The clipboard flavors we care about for a paste. */
export interface ClipboardPaste {
    /** `text/plain` flavor — used for size heuristics and as the default body. */
    text: string;
    /** `text/html` flavor when the source provided one. */
    html?: string;
}
/** Read the relevant clipboard flavors from a paste/drop DataTransfer. */
export declare function readClipboardPaste(data: {
    getData(type: string): string;
} | null | undefined): ClipboardPaste;
export declare function shouldConvertPasteToAttachment(text: string): boolean;
/**
 * Whether a clipboard paste is large enough to become a `Pasted text`
 * attachment chip. Mirrors `shouldConvertPasteToAttachment` but evaluates the
 * representation we'd actually store, so an HTML-only paste (empty text/plain)
 * still converts on the strength of its markup.
 */
export declare function shouldConvertClipboardToAttachment(paste: ClipboardPaste): boolean;
/**
 * Build the attachment File for a page-sized paste, preserving HTML markup when
 * the pasted content is an HTML document so it travels the same rail as an
 * uploaded .html file.
 */
export declare function createPastedAttachmentFile(paste: ClipboardPaste): File;
/** Back-compat helper for callers that only have plain text. */
export declare function createPastedTextFile(text: string): File;
export declare function isPastedTextAttachmentName(name: string | undefined): boolean;
export declare function unwrapAttachmentEnvelope(text: string): string;
export declare function countLines(text: string): number;
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