/**
 * ISO 17442 Legal Entity Identifier — Peppol scheme `0199`.
 *
 * Format: 18 uppercase alphanumerics then 2 check digits.
 * Check: ISO/IEC 7064 MOD 97-10 — map A=10 … Z=35, read the whole 20-character
 * value as one number, and require a remainder of 1.
 *
 * Both halves are the code list's `validation-rules` line verbatim
 * ("RegEx: [A-Z0-9]{18}[0-9]{2}" + "Check digit: mod97-10"), with the algorithm
 * spelled out in its `structure` field.
 *
 * ⚠️ Uppercase only — the issuer's rule, not a preference of ours: ISO 17442
 * defines the alphabet as "A-Z only, without special characters". Whether the
 * network tolerates a lowercase spelling is UNMEASURED, so a lowercase value is
 * refused on format rather than folded to uppercase and silently accepted.
 */
export declare function isValidLei(input: string): boolean;
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