NewLayers creates a new instance of Layers.

NewTouchedLayers creates a new instance that monitors a given root.

Build indicates that a layer should be used for builds.

Cache indicates that a layer should be cached.

Launch indicates that a layer should be used for launch.

DependencyLayer is an extension to Layer that is unique to a dependency.

DownloadLayer is an extension to Layer that is unique to a dependency download.

HelperLayer is an extension to Layer that is unique to a buildpack provided helper.

LaunchLayer is an extension to libbuildpack.LaunchLayer that allows additional functionality to be added.

Layers is an extension allows additional functionality to be added.

MultiDependencyLayer is an extension to Layer that is unique to a collection of dependencies.

TouchedLayers contains information about the layers that have been touched as part of this execution.

DependencyLayerContributor defines a callback function that is called when a dependency needs to be contributed.

HelperLayerContributor defines a callback function that is called when a buildpack provided helper needs to be contributed.

LayerContributor defines a callback function that is called when a layer needs to be contributed.

MultiDependencyLayerContributor defines a callback function that is called when a dependency needs to be contributed.