/**
 * Verification-code (OTP/2FA) extraction from email subject + plain body text.
 *
 * A bare `\d{6}` regex matches order numbers, phone fragments, years, and
 * prices, so extraction is two-phase instead: generate shaped candidates,
 * then score each by keyword proximity (English + German) minus negative
 * context and shape penalties. Only candidates clearing a threshold are
 * returned — no hit is better than a wrong hit landing on the clipboard.
 *
 * The caller is responsible for preparing `bodyText`
 * (`bodyText ?? stripHtml(bodyHtml)`, then `stripReplyChain`).
 */
export interface VerificationCodeMatch {
    /** Canonical code to copy/paste (separators stripped, `G-` prefix removed). */
    code: string;
    /** The code exactly as it appeared in the mail. */
    display: string;
    confidence: 'high' | 'medium' | 'low';
    score: number;
    /** Trimmed line the code was found on (≤120 chars) — never log this blindly. */
    evidence: string;
    source: 'subject' | 'body';
}
/**
 * Extract the most likely verification code. Returns `undefined` when no
 * candidate clears the acceptance threshold.
 */
export declare function extractVerificationCode(subject: string, bodyText: string): VerificationCodeMatch | undefined;
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