type: update index.d.ts

Author: jaywcjlove

index.d.ts

@@ -1,6 +1,23 @@
 interface Options {
+  /**
+   * @default js
+   * @description Appends the specified `.js` extension to `import` and `export` declarations.
+   */
   extension?: string;
+  /**
+   * @default false
+   * @description By default, if a declaration file already has an extension, it is preserved. Extensions are added to declaration files that do not have one.
+   */
   replace?: boolean;
+  /**
+   * @default false
+   * @description If set to `true` and a declaration file has an extension that is *not* included in the `observedScriptExtensions` list, the file will be skipped.
+   */
+  skipUnlistedExtensions?: boolean;
+  /**
+   * @default ['js', 'ts', 'jsx', 'tsx', 'mjs', 'cjs']
+   * @description Declaration files with extensions present in this list are considered for extension replacement (based on the `replace` option). Files with extensions *not* in this list will have the `extension` option's value appended to them.
+   */
   observedScriptExtensions?: [string];
 }