/**
 * Rendering an unknown throw as text.
 *
 * `catch (err)` binds `unknown`: JavaScript lets any value be thrown, and the DNS resolver, a
 * lexicon parser, or a stranger's `dist/data.js` may throw a string as readily as an `Error`.
 * Every place that puts a caught value into a message needs the same two-line dance, so it
 * lives here once.
 *
 * This module is a leaf that imports nothing, and it belongs to no subsystem: `src/build/**`,
 * `src/verify/**`, and `bin/**` all reach it without any of them depending on each other.
 * `src/serve/**`, `src/worker/**`, and `src/node/**` do not use it — see docs/INTERFACES.md.
 */

/**
 * @param {unknown} err
 * @returns {string} `err.message` for an `Error`, and `String(err)` for anything else
 */
export function message(err) {
  return err instanceof Error ? err.message : String(err)
}