Add dependency and configuration helpers to ModSettings.

src/main/java/net/fabricmc/loom/api/ModSettings.java

@@ -28,6 +28,8 @@ import javax.inject.Inject;
 
 import org.gradle.api.Named;
 import org.gradle.api.Project;
+import org.gradle.api.artifacts.Configuration;
+import org.gradle.api.artifacts.Dependency;
 import org.gradle.api.file.ConfigurableFileCollection;
 import org.gradle.api.provider.ListProperty;
 import org.gradle.api.tasks.SourceSet;
@@ -77,6 +79,23 @@ public abstract class ModSettings implements Named {
 		getModSourceSets().add(new SourceSetReference(sourceSet, project));
 	}
 
+	/**
+	 * Add a number of {@link Dependency} to the mod's classpath group. Should be used to include all dependencies that are shaded into your mod.
+	 *
+	 * <p>Uses a detached configuration.
+	 */
+	public void dependency(Dependency... dependencies) {
+		Configuration detachedConfiguration = getProject().getConfigurations().detachedConfiguration(dependencies);
+		configuration(detachedConfiguration);
+	}
+
+	/**
+	 * Add a {@link Configuration} to the mod's classpath group. Should be used to include all dependencies that are shaded into your mod.
+	 */
+	public void configuration(Configuration configuration) {
+		getModFiles().from(configuration);
+	}
+
 	/**
 	 * List of classpath directories, used to populate the `fabric.classPathGroups` Fabric Loader system property.
 	 * Use the {@link ModSettings#sourceSet} methods to add to this.

src/test/groovy/net/fabricmc/loom/test/integration/SplitProjectTest.groovy

@@ -38,7 +38,7 @@ class SplitProjectTest extends Specification implements GradleProjectTestTrait {
             def gradle = gradleProject(project: "splitSources", version: version)
 
         when:
-            def result = gradle.run(task: "build")
+            def result = gradle.run(tasks: ["build", "generateDLIConfig"])
 
         then:
             result.task(":build").outcome == SUCCESS

src/test/resources/projects/splitSources/build.gradle

@@ -6,8 +6,21 @@ plugins {
 sourceCompatibility = JavaVersion.VERSION_17
 targetCompatibility = JavaVersion.VERSION_17
 
+configurations {
+	shade
+}
+
 loom {
 	splitEnvironmentSourceSets()
+
+	mods {
+		modid {
+			sourceSet sourceSets.main
+			sourceSet sourceSets.client
+
+			configuration configurations.shade
+		}
+	}
 }
 
 dependencies {
@@ -16,6 +29,8 @@ dependencies {
 	modImplementation "net.fabricmc:fabric-loader:0.13.3"
 
 	modImplementation "net.fabricmc.fabric-api:fabric-api:0.47.8+1.18.2"
+
+	shade "com.googlecode.json-simple:json-simple:1.1.1"
 }
 
 tasks.withType(JavaCompile).configureEach {