/**
 * Parse blessed-style descriptor strings into ANSI escape codes.
 * Replaces BlessedProgram.prototype.style / _attr.
 *
 * Supports:
 *   Attributes: "bold", "dim", "italic", "underline", "strikeout", "blink", "inverse", "invisible"
 *   Negated:    "!bold", "!dim", etc.
 *   Named fg:   "red fg", "brightBlue fg", "gray fg", "default fg"
 *   Named bg:   "red bg", "brightBlue bg", "gray bg", "default bg"
 *   Hex fg/bg:  "#ff0000 fg", "#ff0000(196) fg", "#aabb00 bg"
 *   SGR index:  "196 fg", "232 bg"
 *   Combined:   ["bold", "red fg"] or "bold, red fg"
 *   Default:    "default"
 */
/**
 * Convert blessed-style descriptor(s) to ANSI escape sequence.
 *
 * @example
 *   parseStyleDescriptor('bold')              // '\x1b[1m'
 *   parseStyleDescriptor('!bold')             // '\x1b[22m'
 *   parseStyleDescriptor(['bold', 'red fg'])  // '\x1b[1;31m'
 *   parseStyleDescriptor('bold, red fg')      // '\x1b[1;31m'
 */
export declare function parseStyleDescriptor(param: string | string[]): string;
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