import type { Nodes } from "@rethinkhealth/hl7v2-ast";
/**
 * Check if an HL7v2 AST node is semantically empty.
 *
 * A node is empty when it contains no meaningful data — no subcomponent
 * anywhere in its subtree has a non-empty string value.
 *
 * This follows the HL7v2 specification (Chapter 2, Section 2.5.3) and
 * Conformance Methodology R1 (2019) definition of "non-empty value":
 * at least one character must be a non-whitespace character.
 *
 * ## HL7v2 emptiness semantics
 *
 * | Encoding    | Wire form     | isEmpty? | Meaning                          |
 * |-------------|---------------|----------|----------------------------------|
 * | `value`     | `\|value\|`   | `false`  | Field has data                   |
 * | `^DOE`      | `\|^DOE\|`    | `false`  | Component 2 has data             |
 * | `~value`    | `\|~value\|`  | `false`  | Repetition 2 has data            |
 * | `""`        | `\|""\|`      | `false`  | Explicit null (delete indicator) |
 * | (empty)     | `\|\|`        | `true`   | Not present                      |
 * | `^^`        | `\|^^\|`      | `true`   | Empty components                 |
 * | `~`         | `\|~\|`       | `true`   | Empty repetitions                |
 * | `~^^`       | `\|~^^\|`     | `true`   | Empty reps with empty components |
 *
 * @param node - The HL7v2 AST node to check (or null/undefined)
 * @returns `true` if the node has no meaningful data
 */
export declare function isEmptyNode(node?: Nodes | null | undefined): boolean;
/**
 * Calculate the byte length of any HL7v2 AST node.
 *
 * For literal nodes (Subcomponent), returns the UTF-8 byte length of the value.
 * For parent nodes, recursively calculates the length of all children. Delimiters are NOT included.
 *
 * @param node - The HL7v2 AST node to measure
 * @returns The total byte length of the node content
 *
 * @example
 * ```ts
 * const field: Field = { type: "field", children: [...] };
 * const length = getByteLength(field); // e.g., 42
 * ```
 */
export declare function getByteLength(node?: Nodes | null | undefined): number;
/**
 * Calculate the string length of any HL7v2 AST node.
 *
 * For literal nodes (Subcomponent), returns `value.length`.
 * For parent nodes, recursively calculates the length of all children. Delimiters are NOT included.
 *
 * Note: Returns JavaScript string length (UTF-16 code units). For UTF-8 byte
 * length (e.g., for wire protocol), use `getByteLength` instead.
 *
 * @param node - The HL7v2 AST node to measure
 * @returns The total string length of the node content
 *
 * @example
 * ```ts
 * const field: Field = { type: "field", children: [...] };
 * const length = getLength(field); // e.g., 42
 * ```
 */
export declare function getLength(node?: Nodes | null | undefined): number;
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