testModuleExportSealed() {
    goog.loadModule('goog.module("a.b.supplied"); exports.foo = {};');
    const exports0 = goog.module.get('a.b.supplied');
    assertTrue(Object.isSealed(exports0));

    goog.loadModule('goog.module("a.b.object"); exports = {};');
    const exports1 = goog.module.get('a.b.object');
    assertTrue(Object.isSealed(exports1));


    goog.loadModule('goog.module("a.b.fn"); exports = function() {};');
    const exports2 = goog.module.get('a.b.fn');
    assertFalse(Object.isSealed(exports2));
  }
@suppress {missingSourcesWarnings} reference to dynamically loaded
namespace.