type BuildState struct {
	OnSignalRebuild func(ids ...identity.Identity)

	DeferredExecutions *DeferredExecutions

	// Deferred executions grouped by rendering context.
	DeferredExecutionsGroupedByRenderingContext map[tpl.RenderingContext]*DeferredExecutions
	// contains filtered or unexported fields
}

type DeferredExecutions struct {
	// A set of filenames in /public that
	// contains a post-processing prefix.
	FilenamesWithPostPrefix *maps.Cache[string, bool]

	// Maps a placeholder to a deferred execution.
	Executions *maps.Cache[string, *tpl.DeferredExecution]
}

type Deps struct {
	// The logger to use.
	Log loggers.Logger `json:"-"`

	ExecHelper *hexec.Exec

	// The template funcs.
	TmplFuncMap map[string]any

	// The file systems to use.
	Fs *hugofs.Fs `json:"-"`

	// The PathSpec to use
	*helpers.PathSpec `json:"-"`

	// The ContentSpec to use
	*helpers.ContentSpec `json:"-"`

	// The SourceSpec to use
	SourceSpec *source.SourceSpec `json:"-"`

	// The Resource Spec to use
	ResourceSpec *resources.Spec

	// The configuration to use
	Conf config.AllProvider `json:"-"`

	// The memory cache to use.
	MemCache *dynacache.Cache

	// The translation func to use
	Translate func(ctx context.Context, translationID string, templateData any) string `json:"-"`

	// The site building.
	Site page.Site

	TemplateProvider ResourceProvider
	// Used in tests
	OverloadedTemplateFuncs map[string]any

	TranslationProvider ResourceProvider

	Metrics metrics.Provider

	// BuildStartListeners will be notified before a build starts.
	BuildStartListeners *Listeners[any]

	// BuildEndListeners will be notified after a build finishes.
	BuildEndListeners *Listeners[any]

	// OnChangeListeners will be notified when something changes.
	OnChangeListeners *Listeners[identity.Identity]

	// Resources that gets closed when the build is done or the server shuts down.
	BuildClosers *types.Closers

	// This is common/global for all sites.
	BuildState *BuildState

	// Holds RPC dispatchers for Katex etc.
	// TODO(bep) rethink this re. a plugin setup, but this will have to do for now.
	WasmDispatchers *warpc.Dispatchers

	// The JS batcher client.
	JSBatcherClient js.BatcherClient
	// contains filtered or unexported fields
}

type DepsCfg struct {
	// The logger to use. Only set in some tests.
	// TODO(bep) get rid of this.
	TestLogger loggers.Logger

	// The logging level to use.
	LogLevel logg.Level

	// Logging output.
	StdErr io.Writer

	// The console output.
	StdOut io.Writer

	// The file systems to use
	Fs *hugofs.Fs

	// The Site in use
	Site page.Site

	Configs *allconfig.Configs

	// Template handling.
	TemplateProvider ResourceProvider

	// i18n handling.
	TranslationProvider ResourceProvider

	// ChangesFromBuild for changes passed back to the server/watch process.
	ChangesFromBuild chan []identity.Identity
}

type Listeners[T any] struct {
	sync.Mutex
	// contains filtered or unexported fields
}

type ResourceProvider interface {
	NewResource(dst *Deps) error
	CloneResource(dst, src *Deps) error
}