/*******
 * Split a flat “array body” string into top-level segments by a single-character separator,
 * while ignoring separators that appear inside:
 * - quoted strings ("…" or '…', with backslash escapes),
 * - nested arrays (both `[...]` and `«...»`),
 * - tag headers (`<...>`), meaning the attribute/header region only.
 *
 * This is a lightweight, single-pass scanner used to safely split list-like
 * surfaces (e.g. comma-separated items) without being fooled by commas that
 * are syntactically “owned” by deeper structures.
 *
 * Important limitations / expectations:
 * - `separator` is treated as a *single character* (the code compares `ch === separator`).
 * - The tag-header guard only covers `<...>` headers; it does not attempt to
 *   understand or skip content between `<tag>` and `</tag>`.
 * - Quote handling supports backslash escaping and ends a string only when the
 *   matching quote character is encountered unescaped.
 * - Nesting depths are tracked independently for square brackets and guillemets.
 *   Depths are assumed to be well-formed in the input.
 *
 * Output:
 * - Each segment is `trim()`’d.
 * - Empty segments are dropped (e.g. trailing separators or `a,,b`), but note that
 *   truly empty *quoted* values (like `""`) survive because their segment length is
 *   non-zero.
 *
 * @param str - The input string to split (typically a bracketless/flat slice).
 * @param separator - The single-character separator to split on (commonly `,`).
 * @returns An array of top-level segments with surrounding whitespace removed.
 *******/
export declare function split_array_string(str: string, separator: string): string[];
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