getPrototypeOf(_target) {
        return null;
      }
@typedef {object} DeferredExports
@property {Record<string, any>} exportsTarget - The object to which a
module's exports will be added.
@property {Record<string, any>} exportsProxy - A proxy over the `exportsTarget`,
used to expose its "exports" to other compartments.
@property {() => void} activate - Activate the `exportsProxy` such that it can
be used as a module namespace object.