babel/packages/babel-plugin-proposal-class-static-block/test/fixtures/class-static-block/new-target/output.js

class Base {
  constructor() {
    this.Foo = class {
      static #_ = (() => {
        this.foo = new.target;
      })();
    };
  }

}

expect(new Base().Foo.foo).toBe(undefined);