// @ts-check

/**
 * A node path is an array of indices that can traverse a Node tree.
 *
 * For example, given the following tree:
 *
 * ```javascript
 * {
 *   name: "top",
 *   children: [
 *     { name: "first" },
 *     { name: "second", children: [{ name: "grandchild" }] },
 *   ],
 * }
 * ```
 *
 * `[]` is "top", `[0]` is "first", `[1]` is "second", and `[1, 0]` is "grandchild".
 *
 * @typedef {number[]} NodePath
 */

/**
 * @param {unknown} value
 * @returns {null | NodePath} The parsed node path, or null if invalid.
 */
export const parse = (value) => {
  if (typeof value !== "string") return null;
  return value.split(".").map(Number);
};