* {@return in which context the source files will be used}
     * Not to be confused with dependency scope.
     * The default value is {@code "main"}.
     *
     * @see ProjectScope#MAIN
     */
    default ProjectScope scope() {
        return ProjectScope.MAIN;
    }

    /**
     * {@return the language of the source files}
     * The default value is {@code "java"}.
     *
     * @see Language#JAVA_FAMILY

import java.util.stream.Stream;

import org.apache.maven.RepositoryUtils;
import org.apache.maven.api.Language;
import org.apache.maven.api.ProducedArtifact;
import org.apache.maven.api.Project;
import org.apache.maven.api.ProjectScope;
import org.apache.maven.api.RemoteRepository;
import org.apache.maven.api.Service;
import org.apache.maven.api.SourceRoot;
import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.di.SessionScoped;

     * @param directory the directory to add if not already present in the source
     *
     * @see #getEnabledSourceRoots(Project, ProjectScope, Language)
     */
    void addSourceRoot(
            @Nonnull Project project, @Nonnull ProjectScope scope, @Nonnull Language language, @Nonnull Path directory);

    /**
     * Returns an immutable list of project remote repositories (directly specified or inherited).

     * @see Build#getDirectory()
     */
    @Nonnull
    default Path getOutputDirectory(@Nullable ProjectScope scope) {
        String dir;
        Build build = getBuild();
        if (scope == ProjectScope.MAIN) {
            dir = build.getOutputDirectory();
        } else if (scope == ProjectScope.TEST) {
            dir = build.getTestOutputDirectory();
        } else {
            dir = build.getDirectory();

    Packaging requirePackaging(@Nonnull String id);

    /**
     * Obtain the {@link ProjectScope} from the specified {@code id}.
     * <p>
     * Shortcut for {@code getService(ProjectScopeRegistry.class).require(...)}.
     *
     * @see org.apache.maven.api.services.ProjectScopeRegistry#require(String)
     */
    @Nonnull
    ProjectScope requireProjectScope(@Nonnull String id);

    /**