fix(inquirer): add missing transformer function

types/inquirer/index.d.ts

@@ -112,6 +112,12 @@ declare namespace inquirer {
          * The value returned will be added to the Answers hash.
          */
         filter?(input: string): string | Promise<string>;
+        /**
+         * Receive the user input and return the transformed value to be displayed to the user. The
+         * transformation only impacts what is shown while editing. It does not impact the answers
+         * hash.
+         */
+        transformer?(input: string): string;
         /**
          * Receive the current user answers hash and should return true or false depending on whether or
          * not this question should be asked. The value can also be a simple boolean.