Add dev config with default jar task on it, to aid with depending on … (#525)

* Add dev config with default jar task on it, to aid with depending on sub projects.

* Rename to `namedElements`

* Update src/main/java/net/fabricmc/loom/configuration/CompileConfiguration.java

Co-authored-by: Juuxel <6596629+Juuxel@users.noreply.github.com>

Co-authored-by: Juuxel <6596629+Juuxel@users.noreply.github.com>

src/main/java/net/fabricmc/loom/configuration/CompileConfiguration.java

@@ -57,6 +57,10 @@ public final class CompileConfiguration {
 		extension.createLazyConfiguration(Constants.Configurations.MINECRAFT).configure(configuration -> configuration.setTransitive(false));
 		extension.createLazyConfiguration(Constants.Configurations.INCLUDE).configure(configuration -> configuration.setTransitive(false)); // Dont get transitive deps
 		extension.createLazyConfiguration(Constants.Configurations.MAPPING_CONSTANTS);
+		extension.createLazyConfiguration(Constants.Configurations.NAMED_ELEMENTS).configure(configuration -> {
+			configuration.setCanBeConsumed(true);
+			configuration.setCanBeResolved(false);
+		});
 
 		extendsFrom(JavaPlugin.COMPILE_ONLY_CONFIGURATION_NAME, Constants.Configurations.MAPPING_CONSTANTS, project);
 
@@ -147,6 +151,9 @@ public final class CompileConfiguration {
 			}
 		});
 
+		// Add the "dev" jar to the "namedElements" configuration
+		p.artifacts(artifactHandler -> artifactHandler.add(Constants.Configurations.NAMED_ELEMENTS, p.getTasks().getByName("jar")));
+
 		if (p.getPluginManager().hasPlugin("org.jetbrains.kotlin.kapt")) {
 			// If loom is applied after kapt, then kapt will use the AP arguments too early for loom to pass the arguments we need for mixin.
 			throw new IllegalArgumentException("fabric-loom must be applied BEFORE kapt in the plugins { } block.");

src/main/java/net/fabricmc/loom/util/Constants.java

@@ -72,6 +72,7 @@ public class Constants {
 		public static final String LOOM_DEVELOPMENT_DEPENDENCIES = "loomDevelopmentDependencies";
 		public static final String MAPPING_CONSTANTS = "mappingsConstants";
 		public static final String UNPICK_CLASSPATH = "unpick";
+		public static final String NAMED_ELEMENTS = "namedElements";
 
 		private Configurations() {
 		}

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

@@ -31,10 +31,6 @@ allprojects {
 
 	}
 
-	configurations {
-		dev
-	}
-
 	jar {
 		archiveClassifier.set "dev"
 	}

src/test/resources/projects/multiproject/example/build.gradle

@@ -1,7 +1,7 @@
 archivesBaseName = "example"
 
 dependencies {
-	implementation project(path: ":core", configuration: "dev")
+	implementation project(path: ":core", configuration: "namedElements")
 }
 
 loom {