//#region src/is-valid-ncm/is-valid-ncm.d.ts
/**
 * Validates if a NCM (Nomenclatura Comum do Mercosul) code exists in the official table.
 *
 * A string is only read as a code when it is written in one of the documented forms: the 8
 * digits, or the `NNNN.NN.NN` mask, with a single separator between the groups and optional
 * surrounding whitespace. Anything else (`"abc01012100"`) is rejected instead of having its
 * digits picked out. A number is only read as a code when it is a non-negative safe integer,
 * since a sign, a decimal point or a rounded magnitude would otherwise be read as a code the
 * caller never wrote.
 *
 * An NCM code is always 8 digits and its leading zeros are part of it, so a value written as
 * bare digits is left padded with zeros to 8 whether it comes as a string or as a number:
 * `1012100`, `"1012100"` and `"01012100"` are the same code. A masked value already carries its
 * separators and is read as written.
 *
 * @param {string|number} value - The NCM code to be validated, with or without the
 * `NNNN.NN.NN` mask.
 * @returns {boolean} True when the code is a known 8 digit NCM code, false otherwise.
 *
 * @example
 * ```typescript
 * isValidNcm("0101.21.00"); // true
 * isValidNcm("01012100"); // true
 * isValidNcm(1012100); // true (padded to 8 digits, so this is "01012100")
 * isValidNcm("1012100"); // true (padded to 8 digits, so this is "01012100")
 * isValidNcm("00000000"); // false
 * isValidNcm("abc01012100"); // false (not a documented form)
 * isValidNcm(-84713012); // false (not a non-negative safe integer)
 * ```
 *
 * @see Official: https://portalunico.siscomex.gov.br/classif/api/publico/nomenclatura/download/json
 */
export declare const isValidNcm: (value: string | number) => boolean;
//#endregion