feat: more tweaks

Author: RebeccaStevens

src/configs/functional.ts

@@ -172,6 +172,10 @@ export async function functional(
             immutability: "ReadonlyShallow",
             comparator: "AtLeast",
             fixer: [
+              {
+                pattern: "^([A-Za-z0-9_\\.]+\\[\\])$",
+                replace: "readonly $1",
+              },
               {
                 pattern: "^(Array|Map|Set)<(.+)>$",
                 replace: "Readonly$1<$2>",