String scope = dependency.getScope();
                if (scope == null) {
                    scope = "";
                }
                return session.requireDependencyScope(scope);
            }

            @Override
            public Boolean getOptional() {
                return dependency.isOptional();
            }

            @Nonnull

     * @throws IllegalArgumentException if the given identifier is not a known scope
     *
     * @see org.apache.maven.api.DependencyScope#forId(String)
     */
    @Nonnull
    DependencyScope requireDependencyScope(@Nonnull String id);

    /**
     * Obtain the {@link PathScope} from the specified {@code id}.
     * <p>
     * Shortcut for {@code getService(PathScopeRegistry.class).require(...)}.
     *