export interface Signature {
    text: string | null;
    html: string | null;
    font: string | null;
}
/**
 * Load an account's saved email signature from the fixed account-dir convention.
 * `.txt` and `.html` are returned verbatim (appended byte-for-byte). `.font` is a
 * single CSS font-family value, trimmed of surrounding whitespace. A missing file
 * is null, never an error: a draft still composes without a signature.
 */
export declare function loadSignature(accountDir: string | undefined): Signature;
/**
 * Append the signature to a draft's body/html deterministically, with no model
 * judgement. The plain-text signature is appended to body whenever present. The
 * html signature and the font wrap apply only when the caller supplied html:
 * font is HTML-only and has no plain-text analogue. `applied` is true when at
 * least one signature part (text or html) was appended; the font wrap alone does
 * not set it.
 */
export declare function applySignature(input: {
    body: string;
    html?: string;
}, sig: Signature): {
    body: string;
    html?: string;
    applied: boolean;
};
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