Treat {} in T = {} as any in JS files (#19977)

tests/cases/compiler/defaultPropsEmptyCurlyBecomesAnyForJs.ts

@@ -0,0 +1,26 @@
+// @allowJs: true
+// @outDir: ./built
+// @filename: library.d.ts
+export class Foo<T = {}, U = {}> {
+    props: T;
+    state: U;
+    constructor(props: T, state: U);
+}
+
+// @filename: component.js
+import { Foo } from "./library";
+export class MyFoo extends Foo {
+    member;
+}
+
+// @filename: typed_component.ts
+import { MyFoo } from "./component";
+export class TypedFoo extends MyFoo {
+    constructor() {
+        super({x: "string", y: 42}, { value: undefined });
+        this.props.x;
+        this.props.y;
+        this.state.value;
+        this.member;
+    }
+}