Refactor types to use readonly

Author: wooorm

lib/index.js

@@ -6,7 +6,7 @@
 
 import {color as colorDefault} from '#conditional-color'
 
-/** @type {Options} */
+/** @type {Readonly<Options>} */
 const emptyOptions = {}
 
 // To do: next major (?): use `Object.hasOwn`.
@@ -17,7 +17,7 @@ const own = {}.hasOwnProperty
  *
  * @param {unknown} tree
  *   Tree to inspect.
- * @param {Options | null | undefined} [options]
+ * @param {Readonly<Options> | null | undefined} [options]
  *   Configuration.
  * @returns {string}
  *   Pretty printed `tree`.
@@ -48,7 +48,7 @@ export function inspect(tree, options) {
  *   Use `inspect` instead, with `color: false`.
  * @param {unknown} tree
  *   Tree to inspect.
- * @param {Omit<Options, 'color'> | null | undefined} [options]
+ * @param {Readonly<Omit<Options, 'color'>> | null | undefined} [options]
  *   Configuration.
  * @returns {string}
  *   Pretty printed `tree`.
@@ -65,7 +65,7 @@ export function inspectNoColor(tree, options) {
  *   Use `inspect` instead, with `color: true`.
  * @param {unknown} tree
  *   Tree to inspect.
- * @param {Omit<Options, 'color'> | null | undefined} [options]
+ * @param {Readonly<Omit<Options, 'color'>> | null | undefined} [options]
  *   Configuration (optional).
  * @returns {string}
  *   Pretty printed `tree`.