Add tests

tests/cases/importTypeOnly.ts

@@ -4,3 +4,11 @@ import type * as types from "mod";
 import type from "mod";
 import type = require("mod");
 import type T = require("mod");
+import { type X } from "mod";
+import { X, type Y} from "mod";
+import type { type X } from "mod"; // grammar error
+import { type as foo } from "mod"; // not type-only
+import { type type } from "mod";
+import { type as as as } from "mod";
+import { type type as as } from "mod";
+import { type type as type } from "mod";