/**
 * Estonian VAT number (KMKR, Peppol `9931` / `EE:VAT`) check — GPR-1396.
 *
 * `EE` + nine digits; the ninth is a check digit: weights 3,7,1,3,7,1,3,7 over
 * the first eight, then `(10 - sum mod 10) mod 10`. Measured on the whole
 * Äriregister open data of 2026-10-03: all 131 565 VAT numbers pass it.
 *
 * The `EE` prefix is OPTIONAL and case-insensitive here, as for the German
 * USt-IdNr (GPR-1045): of the 890 live `9931` participants on the Peppol
 * Directory (2026-10-03), 68 carry no prefix and 824 are lowercase. Registering
 * your OWN number still requires the prefix — that rule lives with the scheme
 * (`SCHEMES_BY_COUNTRY.EE`), not here.
 *
 * ⚠️ Only the literal `EE` is stripped, never "any two leading letters": a
 * foreign prefix on a nine-digit body is not an Estonian number.
 */
export declare function isValidEeVat(input: string): boolean;
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