swc/crates/swc_ecma_parser/tests/tsc/protectedClassPropertyAccessibleWithinSubclass3.ts

class Base {
    protected x: string;
    method() {
        this.x;            // OK, accessed within their declaring class
    }
}

class Derived extends Base {
    method1() {
        this.x;            // OK, accessed within a subclass of the declaring class
        super.x;           // Error, x is not public
    }
}