* execute this script.
     *
     * @return the classpath handler. Never returns null.
     */
    ScriptHandler getBuildscript();

    /**
     * Configures the classpath for this script.
     *
     * <p>The given closure is executed against this script's {@link ScriptHandler}. The {@link ScriptHandler} is passed
     * to the closure as the closure's delegate.
     *

    }
}


private
fun buildInitScriptModel(initScript: File, rootProject: ProjectInternal): NonProjectScriptModel {
    val gradle = rootProject.gradle

    val (scriptHandler, scriptClassPath) = compilationClassPathForScriptPluginOf(
        target = gradle,
        scriptFile = initScript,
        baseScope = gradle.classLoaderScope,

====

The closure passed to the `initscript()` method configures a link:{javadocPath}/org/gradle/api/initialization/dsl/ScriptHandler.html[ScriptHandler] instance.
You declare the init script classpath by adding dependencies to the `classpath` configuration.

This is the same way you declare, for example, the Java compilation classpath.

Class <org.gradle.api.execution.TaskExecutionGraph> is not annotated with @ServiceScope in (TaskExecutionGraph.java:0)
Class <org.gradle.api.initialization.dsl.ScriptHandler> is not annotated with @ServiceScope in (ScriptHandler.java:0)
Class <org.gradle.api.internal.ProcessOperations> is not annotated with @ServiceScope in (ProcessOperations.java:0)

    sealed class Instruction {

        /**
         * Causes the configuration of the embedded Kotlin libraries
         * on the host's ScriptHandler.
         */
        object SetupEmbeddedKotlin : Instruction()

        /**
         * Causes the target scope to be closed without applying any plugins.
         */

import org.gradle.api.file.CopySpec
import org.gradle.api.file.DeleteSpec
import org.gradle.api.file.FileTree
import org.gradle.api.file.ProjectLayout
import org.gradle.api.file.SyncSpec
import org.gradle.api.initialization.dsl.ScriptHandler
import org.gradle.api.invocation.Gradle
import org.gradle.api.logging.Logger
import org.gradle.api.logging.LoggingManager
import org.gradle.api.model.ObjectFactory
import org.gradle.api.plugins.ExtensionContainer

import org.gradle.api.Project
import org.gradle.api.Task

import org.gradle.api.artifacts.Dependency
import org.gradle.api.artifacts.dsl.RepositoryHandler

import org.gradle.api.initialization.dsl.ScriptHandler

import org.gradle.api.internal.artifacts.dependencies.DefaultFileCollectionDependency
import org.gradle.api.internal.artifacts.dsl.dependencies.DependencyFactoryInternal

				// while the script is still running.
				scriptHandler, err := s.loadScript(context.Background(), logger, scriptRelPath, content, workDir)
				if err != nil {
					r.err = err
					return
				}
				r.handler = http.StripPrefix(prefix, scriptHandler)
			}()
		}

		if r.hash != hash {
			continue // Raced with an update from another handler; try again.

import org.gradle.api.Incubating;
import org.gradle.api.UnknownProjectException;
import org.gradle.api.cache.CacheConfigurations;
import org.gradle.api.file.BuildLayout;
import org.gradle.api.initialization.dsl.ScriptHandler;
import org.gradle.api.initialization.resolve.DependencyResolutionManagement;
import org.gradle.api.invocation.Gradle;
import org.gradle.api.plugins.ExtensionAware;
import org.gradle.api.plugins.PluginAware;

     *
     * @return the classpath handler. Never returns null.
     */
    ScriptHandler getBuildscript();

    /**
     * <p>Configures the build script classpath for this project.
     *
     * <p>The given closure is executed against this project's {@link ScriptHandler}. The {@link ScriptHandler} is
     * passed to the closure as the closure's delegate.
     *