diff --git a/cache.go b/cache.go
index 45a29e8..aa9050e 100644
--- a/cache.go
+++ b/cache.go
@@ -15,7 +15,7 @@ type cache struct {
 	baseDir string
 }
 
-func (self *cache) retrieveFile(context *Context, outputPath string, inputFiles []*File) (*File, error) {
+func (self *cache) retrieveFile(context *Context, outputPath string, inputFiles []File) (File, error) {
 	cachePath, err := self.buildCachePath(context, outputPath, inputFiles)
 	if err != nil {
 		return nil, err
@@ -33,7 +33,7 @@ func (self *cache) retrieveFile(context *Context, outputPath string, inputFiles
 	return outputFile, nil
 }
 
-func (self *cache) storeFile(context *Context, outputFile *File, inputFiles []*File) error {
+func (self *cache) storeFile(context *Context, outputFile File, inputFiles []File) error {
 	cachePath, err := self.buildCachePath(context, outputFile.Path(), inputFiles)
 	if err != nil {
 		return err
@@ -69,7 +69,7 @@ func (self *cache) storeFile(context *Context, outputFile *File, inputFiles []*F
 	return nil
 }
 
-func (self *cache) buildCachePath(context *Context, outputPath string, inputFiles []*File) (string, error) {
+func (self *cache) buildCachePath(context *Context, outputPath string, inputFiles []File) (string, error) {
 	hasher := crc32.NewIEEE()
 	hasher.Write([]byte(outputPath))
 
diff --git a/context.go b/context.go
index 7a90044..75b7981 100644
--- a/context.go
+++ b/context.go
@@ -24,20 +24,20 @@ type Context struct {
 	threads int
 	index   int
 
-	filesIn  chan *File
-	filesOut chan *File
+	filesIn  chan File
+	filesOut chan File
 }
 
 // CreateFileFrom data creates a new file instance from the provided data buffer.
-func (self *Context) CreateFileFromReader(sourcePath string, reader io.Reader) (*File, error) {
+func (self *Context) CreateFileFromReader(sourcePath string, reader io.Reader) (File, error) {
 	data, err := io.ReadAll(reader)
 	if err != nil {
 		return nil, err
 	}
 
-	file := &File{
+	file := &rawFile{
 		relPath: sourcePath,
-		props:   make(map[string]Prop),
+		props:   make(map[string]FileProp),
 		modTime: time.Now(),
 		size:    int64(len(data)),
 		reader:  bytes.NewReader(data),
@@ -48,7 +48,7 @@ func (self *Context) CreateFileFromReader(sourcePath string, reader io.Reader) (
 }
 
 // CreateFileFromAsset creates a new file instance from the provided file path.
-func (self *Context) CreateFileFromAsset(sourcePath, dataPath string) (*File, error) {
+func (self *Context) CreateFileFromAsset(sourcePath, dataPath string) (File, error) {
 	if filepath.IsAbs(sourcePath) {
 		return nil, errors.New("source paths must be relative")
 	}
@@ -65,9 +65,9 @@ func (self *Context) CreateFileFromAsset(sourcePath, dataPath string) (*File, er
 		return nil, errors.New("assets must be files")
 	}
 
-	file := &File{
+	file := &rawFile{
 		relPath:  sourcePath,
-		props:    make(map[string]Prop),
+		props:    make(map[string]FileProp),
 		modTime:  info.ModTime(),
 		size:     info.Size(),
 		dataPath: dataPath,
@@ -78,14 +78,14 @@ func (self *Context) CreateFileFromAsset(sourcePath, dataPath string) (*File, er
 }
 
 // DispatchFile causes the file to get passed to the next link in the chain.
-func (self *Context) DispatchFile(file *File) {
+func (self *Context) DispatchFile(file File) {
 	self.filesOut <- file
 }
 
 // DispatchAndCacheFile caches the file data (excluding the metadata), taking
 // dependencies on any input files that are needed to generate it, and then
 // passes it to the next link in the chain.
-func (self *Context) DispatchAndCacheFile(outputFile *File, inputFiles ...*File) {
+func (self *Context) DispatchAndCacheFile(outputFile File, inputFiles ...File) {
 	if self.goldsmith.cache != nil {
 		self.goldsmith.cache.storeFile(self, outputFile, inputFiles)
 	}
@@ -96,8 +96,8 @@ func (self *Context) DispatchAndCacheFile(outputFile *File, inputFiles ...*File)
 // RetrieveCachedFile looks up file data (excluding the metadata), given an
 // output path and any input files that are needed to generate it. The function
 // will return nil if the desired file is not found in the cache.
-func (self *Context) RetrieveCachedFile(outputPath string, inputFiles ...*File) *File {
-	var outputFile *File
+func (self *Context) RetrieveCachedFile(outputPath string, inputFiles ...File) File {
+	var outputFile File
 	if self.goldsmith.cache != nil {
 		outputFile, _ = self.goldsmith.cache.retrieveFile(self, outputPath, inputFiles)
 	}
diff --git a/file.go b/file.go
index 91f9e5c..6b5c2e3 100644
--- a/file.go
+++ b/file.go
@@ -9,15 +9,9 @@ import (
 	"time"
 )
 
-type (
-	Prop    any
-	PropMap map[string]Prop
-)
-
-// File represents in-memory or on-disk files in a chain.
-type File struct {
+type rawFile struct {
 	relPath string
-	props   map[string]Prop
+	props   map[string]FileProp
 	modTime time.Time
 	size    int64
 
@@ -27,8 +21,23 @@ type File struct {
 	index int
 }
 
-// Rename modifies the file path relative to the source directory.
-func (self *File) Rename(path string) error {
+func (self *rawFile) Path() string {
+	return filepath.ToSlash(self.relPath)
+}
+
+func (self *rawFile) Dir() string {
+	return filepath.ToSlash(filepath.Dir(self.relPath))
+}
+
+func (self *rawFile) Name() string {
+	return filepath.Base(self.relPath)
+}
+
+func (self *rawFile) Ext() string {
+	return filepath.Ext(self.relPath)
+}
+
+func (self *rawFile) Rename(path string) error {
 	if filepath.IsAbs(path) {
 		return fmt.Errorf("unexpected absolute path: %s", path)
 	}
@@ -37,38 +46,15 @@ func (self *File) Rename(path string) error {
 	return nil
 }
 
-// Path returns the file path relative to the source directory.
-func (self *File) Path() string {
-	return filepath.ToSlash(self.relPath)
-}
-
-// Dir returns the containing directory of the file.
-func (self *File) Dir() string {
-	return filepath.ToSlash(filepath.Dir(self.relPath))
-}
-
-// Name returns the base name of the file.
-func (self *File) Name() string {
-	return filepath.Base(self.relPath)
-}
-
-// Ext returns the extension of the file.
-func (self *File) Ext() string {
-	return filepath.Ext(self.relPath)
-}
-
-// Size returns the file length in bytes.
-func (self *File) Size() int64 {
+func (self *rawFile) Size() int64 {
 	return self.size
 }
 
-// ModTime returns the time of the file's last modification.
-func (self *File) ModTime() time.Time {
+func (self *rawFile) ModTime() time.Time {
 	return self.modTime
 }
 
-// Read reads file data into the provided buffer.
-func (self *File) Read(data []byte) (int, error) {
+func (self *rawFile) Read(data []byte) (int, error) {
 	if err := self.load(); err != nil {
 		return 0, err
 	}
@@ -76,8 +62,7 @@ func (self *File) Read(data []byte) (int, error) {
 	return self.reader.Read(data)
 }
 
-// Write writes file data into the provided writer.
-func (self *File) WriteTo(writer io.Writer) (int64, error) {
+func (self *rawFile) WriteTo(writer io.Writer) (int64, error) {
 	if err := self.load(); err != nil {
 		return 0, err
 	}
@@ -85,8 +70,7 @@ func (self *File) WriteTo(writer io.Writer) (int64, error) {
 	return self.reader.WriteTo(writer)
 }
 
-// Seek updates the file pointer to the desired position.
-func (self *File) Seek(offset int64, whence int) (int64, error) {
+func (self *rawFile) Seek(offset int64, whence int) (int64, error) {
 	if self.reader == nil && offset == 0 && (whence == io.SeekStart || whence == io.SeekCurrent) {
 		return 0, nil
 	}
@@ -98,29 +82,20 @@ func (self *File) Seek(offset int64, whence int) (int64, error) {
 	return self.reader.Seek(offset, whence)
 }
 
-// GoString returns value for string formatting.
-func (self *File) GoString() string {
+func (self *rawFile) GoString() string {
 	return self.relPath
 }
 
-// RemoveProp deletes the metadata property for the provided name.
-func (self *File) RemoveProp(name string) {
-	delete(self.props, name)
-}
-
-// SetProp updates the metadata property for the provided name.
-func (self *File) SetProp(name string, value Prop) {
+func (self *rawFile) SetProp(name string, value FileProp) {
 	self.props[name] = value
 }
 
-// Prop returns the metadata property for the provided name.
-func (self *File) Prop(name string) (Prop, bool) {
+func (self *rawFile) Prop(name string) (FileProp, bool) {
 	value, ok := self.props[name]
 	return value, ok
 }
 
-// PropOrDef returns the metadata property for the provided name or the default.
-func (self *File) PropOrDef(name string, valueDef Prop) Prop {
+func (self *rawFile) PropOrDef(name string, valueDef FileProp) FileProp {
 	if value, ok := self.Prop(name); ok {
 		return value
 	}
@@ -128,19 +103,25 @@ func (self *File) PropOrDef(name string, valueDef Prop) Prop {
 	return valueDef
 }
 
-// Props returns all of the metadata properties.
-func (self *File) Props() PropMap {
+func (self *rawFile) Props() FileProps {
 	return self.props
 }
 
-// CopyProps copies all metadata properties from the provided file.
-func (self *File) CopyProps(file *File) {
-	for key, value := range file.props {
+func (self *rawFile) CopyProps(file File) {
+	for key, value := range file.Props() {
 		self.props[key] = value
 	}
 }
 
-func (self *File) load() error {
+func (self *rawFile) RemoveProp(name string) {
+	delete(self.props, name)
+}
+
+func (self *rawFile) Index() int {
+	return self.index
+}
+
+func (self *rawFile) load() error {
 	if self.reader != nil {
 		return nil
 	}
@@ -153,35 +134,3 @@ func (self *File) load() error {
 	self.reader = bytes.NewReader(data)
 	return nil
 }
-
-func (self *File) export(targetDir string) error {
-	targetPath := filepath.Join(targetDir, self.relPath)
-
-	if targetInfo, err := os.Stat(targetPath); err == nil && !targetInfo.ModTime().Before(self.ModTime()) {
-		return nil
-	}
-
-	if err := os.MkdirAll(filepath.Dir(targetPath), 0755); err != nil {
-		return err
-	}
-
-	fw, err := os.Create(targetPath)
-	if err != nil {
-		return err
-	}
-	defer fw.Close()
-
-	if err := self.load(); err != nil {
-		return err
-	}
-
-	if _, err := self.Seek(0, io.SeekStart); err != nil {
-		return err
-	}
-
-	if _, err := self.WriteTo(fw); err != nil {
-		return err
-	}
-
-	return nil
-}
diff --git a/file_exporter.go b/file_exporter.go
index bc9f468..9a5139a 100644
--- a/file_exporter.go
+++ b/file_exporter.go
@@ -1,6 +1,7 @@
 package goldsmith
 
 import (
+	"io"
 	"os"
 	"path/filepath"
 )
@@ -21,7 +22,7 @@ func (self *fileExporter) Initialize(context *Context) error {
 	return nil
 }
 
-func (self *fileExporter) Process(context *Context, file *File) error {
+func (self *fileExporter) Process(context *Context, file File) error {
 	slicePath := func(path string) string {
 		if filepath.IsAbs(path) {
 			var err error
@@ -33,11 +34,34 @@ func (self *fileExporter) Process(context *Context, file *File) error {
 		return filepath.Clean(path)
 	}
 
-	for token := slicePath(file.relPath); token != "."; token = filepath.Dir(token) {
+	for token := slicePath(file.Path()); token != "."; token = filepath.Dir(token) {
 		self.tokens[token] = true
 	}
 
-	return file.export(self.targetDir)
+	targetPath := filepath.Join(self.targetDir, file.Path())
+	if targetInfo, err := os.Stat(targetPath); err == nil && !targetInfo.ModTime().Before(file.ModTime()) {
+		return nil
+	}
+
+	if err := os.MkdirAll(filepath.Dir(targetPath), 0755); err != nil {
+		return err
+	}
+
+	fw, err := os.Create(targetPath)
+	if err != nil {
+		return err
+	}
+	defer fw.Close()
+
+	if _, err := file.Seek(0, io.SeekStart); err != nil {
+		return err
+	}
+
+	if _, err := file.WriteTo(fw); err != nil {
+		return err
+	}
+
+	return nil
 }
 
 func (self *fileExporter) Finalize(context *Context) error {
diff --git a/filter_util.go b/filter_util.go
index d3744d1..a1a659c 100644
--- a/filter_util.go
+++ b/filter_util.go
@@ -7,9 +7,9 @@ type filterEntry struct {
 
 type filterStack []filterEntry
 
-func (self *filterStack) accept(file *File) bool {
+func (self *filterStack) accept(file File) bool {
 	for _, entry := range *self {
-		if entry.index >= file.index && !entry.filter.Accept(file) {
+		if entry.index >= file.Index() && !entry.filter.Accept(file) {
 			return false
 		}
 	}
diff --git a/filters/condition/condition.go b/filters/condition/condition.go
index eb55d6b..0cf3833 100644
--- a/filters/condition/condition.go
+++ b/filters/condition/condition.go
@@ -16,6 +16,6 @@ func (*Condition) Name() string {
 	return "condition"
 }
 
-func (self *Condition) Accept(file *goldsmith.File) bool {
+func (self *Condition) Accept(file goldsmith.File) bool {
 	return self.accept
 }
diff --git a/filters/operator/operator.go b/filters/operator/operator.go
index 8f6388d..3058f54 100644
--- a/filters/operator/operator.go
+++ b/filters/operator/operator.go
@@ -20,7 +20,7 @@ func (*operatorAnd) Name() string {
 	return "operator"
 }
 
-func (self *operatorAnd) Accept(file *goldsmith.File) bool {
+func (self *operatorAnd) Accept(file goldsmith.File) bool {
 	for _, filter := range self.filters {
 		if !filter.Accept(file) {
 			return false
@@ -42,7 +42,7 @@ func (*operatorNot) Name() string {
 	return "operator"
 }
 
-func (self *operatorNot) Accept(file *goldsmith.File) bool {
+func (self *operatorNot) Accept(file goldsmith.File) bool {
 	return !self.filter.Accept(file)
 }
 
@@ -58,7 +58,7 @@ func (*operatorOr) Name() string {
 	return "operator"
 }
 
-func (self *operatorOr) Accept(file *goldsmith.File) bool {
+func (self *operatorOr) Accept(file goldsmith.File) bool {
 	for _, filter := range self.filters {
 		if filter.Accept(file) {
 			return true
diff --git a/filters/wildcard/wildcard.go b/filters/wildcard/wildcard.go
index 3c5eb7b..066c065 100644
--- a/filters/wildcard/wildcard.go
+++ b/filters/wildcard/wildcard.go
@@ -25,7 +25,7 @@ func (*Wildcard) Name() string {
 	return "wildcard"
 }
 
-func (self *Wildcard) Accept(file *goldsmith.File) bool {
+func (self *Wildcard) Accept(file goldsmith.File) bool {
 	filePath := self.adjustCase(file.Path())
 
 	for _, wildcard := range self.wildcards {
diff --git a/goldsmith.go b/goldsmith.go
index 63c7608..9748423 100644
--- a/goldsmith.go
+++ b/goldsmith.go
@@ -45,7 +45,7 @@ func (self *Goldsmith) Chain(plugin Plugin) *Goldsmith {
 		plugin:     plugin,
 		filtersExt: append(filterStack(nil), self.filters...),
 		index:      self.index,
-		filesOut:   make(chan *File),
+		filesOut:   make(chan File),
 	}
 
 	if len(self.contexts) > 0 {
@@ -87,7 +87,7 @@ func (self *Goldsmith) End(targetDir string) []error {
 	return self.errors
 }
 
-func (self *Goldsmith) fault(name string, file *File, err error) {
+func (self *Goldsmith) fault(name string, file File, err error) {
 	self.mutex.Lock()
 	defer self.mutex.Unlock()
 
diff --git a/interface.go b/interface.go
index c0671f0..d1d2f0d 100644
--- a/interface.go
+++ b/interface.go
@@ -1,5 +1,10 @@
 package goldsmith
 
+import (
+	"io"
+	"time"
+)
+
 // Plugin contains the minimum set of methods required on plugins. Plugins can
 // also optionally implement Initializer, Processor, and Finalizer interfaces.
 type Plugin interface {
@@ -14,7 +19,7 @@ type Initializer interface {
 
 // Processor allows for optional processing of files passing through a plugin.
 type Processor interface {
-	Process(context *Context, file *File) error
+	Process(context *Context, file File) error
 }
 
 // Finalizer allows for optional finalization of a plugin after all files
@@ -26,5 +31,36 @@ type Finalizer interface {
 // Filter is used to determine which files should continue in the chain.
 type Filter interface {
 	Name() string
-	Accept(file *File) bool
+	Accept(file File) bool
+}
+
+type (
+	FileProp  any
+	FileProps map[string]FileProp
+)
+
+// File represents in-memory or on-disk files in a chain.
+type File interface {
+	Path() string
+	Dir() string
+	Name() string
+	Ext() string
+	Rename(path string) error
+
+	Size() int64
+	ModTime() time.Time
+
+	Read(data []byte) (int, error)
+	WriteTo(writer io.Writer) (int64, error)
+	Seek(offset int64, whence int) (int64, error)
+
+	SetProp(name string, value FileProp)
+	Prop(name string) (FileProp, bool)
+	PropOrDef(name string, valueDef FileProp) FileProp
+	Props() FileProps
+	CopyProps(file File)
+	RemoveProp(name string)
+
+	GoString() string
+	Index() int
 }
diff --git a/plugins/absolute/absolute.go b/plugins/absolute/absolute.go
index 9e44697..e6c1d74 100644
--- a/plugins/absolute/absolute.go
+++ b/plugins/absolute/absolute.go
@@ -50,7 +50,7 @@ func (*Absolute) Initialize(context *goldsmith.Context) error {
 	return nil
 }
 
-func (self *Absolute) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (self *Absolute) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	if outputFile := context.RetrieveCachedFile(inputFile.Path(), inputFile); outputFile != nil {
 		outputFile.CopyProps(inputFile)
 		context.DispatchFile(outputFile)
diff --git a/plugins/breadcrumbs/breadcrumbs.go b/plugins/breadcrumbs/breadcrumbs.go
index 011acfa..5218f62 100644
--- a/plugins/breadcrumbs/breadcrumbs.go
+++ b/plugins/breadcrumbs/breadcrumbs.go
@@ -19,7 +19,7 @@ type Crumb struct {
 
 // Node represents information about a specific file in the site's structure.
 type Node struct {
-	File     *goldsmith.File
+	File     goldsmith.File
 	Parent   *Node
 	Children []*Node
 
@@ -75,7 +75,7 @@ func (*Breadcrumbs) Initialize(context *goldsmith.Context) error {
 	return nil
 }
 
-func (self *Breadcrumbs) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (self *Breadcrumbs) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	var parentNameStr string
 	if parentName, ok := inputFile.Prop(self.parentKey); ok {
 		parentNameStr, _ = parentName.(string)
diff --git a/plugins/collection/collection.go b/plugins/collection/collection.go
index b1252ee..731215f 100644
--- a/plugins/collection/collection.go
+++ b/plugins/collection/collection.go
@@ -15,7 +15,7 @@ import (
 )
 
 // A Comparer callback function is used to sort files within a collection group.
-type Comparer func(i, j *goldsmith.File) (less bool)
+type Comparer func(i, j goldsmith.File) (less bool)
 
 // Collection chainable plugin context.
 type Collection struct {
@@ -23,8 +23,8 @@ type Collection struct {
 	groupsKey     string
 	comparer      Comparer
 
-	groups map[string][]*goldsmith.File
-	files  []*goldsmith.File
+	groups map[string][]goldsmith.File
+	files  []goldsmith.File
 	mutex  sync.Mutex
 }
 
@@ -33,7 +33,7 @@ func New() *Collection {
 	return &Collection{
 		collectionKey: "Collection",
 		groupsKey:     "Groups",
-		groups:        make(map[string][]*goldsmith.File),
+		groups:        make(map[string][]goldsmith.File),
 	}
 }
 
@@ -66,7 +66,7 @@ func (*Collection) Initialize(context *goldsmith.Context) error {
 	return nil
 }
 
-func (self *Collection) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (self *Collection) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	self.mutex.Lock()
 	defer func() {
 		inputFile.SetProp(self.groupsKey, self.groups)
@@ -110,7 +110,7 @@ func (self *Collection) Finalize(context *goldsmith.Context) error {
 }
 
 type fileSorter struct {
-	files    []*goldsmith.File
+	files    []goldsmith.File
 	comparer Comparer
 }
 
diff --git a/plugins/document/document.go b/plugins/document/document.go
index fef2b7c..5a1b458 100644
--- a/plugins/document/document.go
+++ b/plugins/document/document.go
@@ -14,12 +14,12 @@ import (
 )
 
 // Processor callback function to modify documents.
-type Processor func(*goldsmith.File, *goquery.Document) error
+type Processor func(goldsmith.File, *goquery.Document) error
 
 // Document plugin context.
 type Document struct {
 	callback Processor
-	files    []*goldsmith.File
+	files    []goldsmith.File
 	mutex    sync.Mutex
 }
 
@@ -37,7 +37,7 @@ func (*Document) Initialize(context *goldsmith.Context) error {
 	return nil
 }
 
-func (self *Document) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (self *Document) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	doc, err := goquery.NewDocumentFromReader(inputFile)
 	if err != nil {
 		return err
diff --git a/plugins/document/document_test.go b/plugins/document/document_test.go
index e8c2094..200f764 100644
--- a/plugins/document/document_test.go
+++ b/plugins/document/document_test.go
@@ -8,7 +8,7 @@ import (
 	"github.com/PuerkitoBio/goquery"
 )
 
-func process(file *goldsmith.File, doc *goquery.Document) error {
+func process(file goldsmith.File, doc *goquery.Document) error {
 	doc.Find("h1").SetAttr("style", "color: red;")
 	return nil
 }
diff --git a/plugins/frontmatter/frontmatter.go b/plugins/frontmatter/frontmatter.go
index 8d91b96..31769a6 100644
--- a/plugins/frontmatter/frontmatter.go
+++ b/plugins/frontmatter/frontmatter.go
@@ -71,7 +71,7 @@ func (*FrontMatter) Initialize(context *goldsmith.Context) error {
 	return nil
 }
 
-func (*FrontMatter) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (*FrontMatter) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	meta, body, err := parse(inputFile)
 	if err != nil {
 		return err
diff --git a/plugins/index/index.go b/plugins/index/index.go
index 168a617..8c453b3 100644
--- a/plugins/index/index.go
+++ b/plugins/index/index.go
@@ -18,7 +18,7 @@ type Entry struct {
 	Name  string
 	Path  string
 	IsDir bool
-	File  *goldsmith.File
+	File  goldsmith.File
 }
 
 // Index chainable plugin context.
@@ -60,7 +60,7 @@ func (*Index) Name() string {
 	return "index"
 }
 
-func (self *Index) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (self *Index) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	self.mutex.Lock()
 	defer self.mutex.Unlock()
 
@@ -131,7 +131,7 @@ func (self *Index) Finalize(context *goldsmith.Context) error {
 
 type directory struct {
 	entries   entriesByName
-	indexFile *goldsmith.File
+	indexFile goldsmith.File
 }
 
 type entriesByName []Entry
diff --git a/plugins/layout/layout.go b/plugins/layout/layout.go
index 79da796..0125080 100644
--- a/plugins/layout/layout.go
+++ b/plugins/layout/layout.go
@@ -20,8 +20,8 @@ type Layout struct {
 	defaultLayout *string
 	helpers       template.FuncMap
 
-	inputFiles    []*goldsmith.File
-	templateFiles []*goldsmith.File
+	inputFiles    []goldsmith.File
+	templateFiles []goldsmith.File
 	mutex         sync.Mutex
 
 	template *template.Template
@@ -70,7 +70,7 @@ func (self *Layout) Initialize(context *goldsmith.Context) error {
 	return nil
 }
 
-func (self *Layout) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (self *Layout) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	self.mutex.Lock()
 	defer self.mutex.Unlock()
 
@@ -128,7 +128,7 @@ func (self *Layout) Finalize(context *goldsmith.Context) error {
 	return nil
 }
 
-func (self *Layout) getFileLayout(file *goldsmith.File) (string, bool) {
+func (self *Layout) getFileLayout(file goldsmith.File) (string, bool) {
 	if name, ok := file.Props()[self.layoutKey].(string); ok {
 		return name, true
 	}
diff --git a/plugins/livejs/livejs.go b/plugins/livejs/livejs.go
index 2a2b8d2..782a481 100644
--- a/plugins/livejs/livejs.go
+++ b/plugins/livejs/livejs.go
@@ -37,7 +37,7 @@ func (self *LiveJs) Initialize(context *goldsmith.Context) error {
 	return nil
 }
 
-func (self *LiveJs) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (self *LiveJs) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	if outputFile := context.RetrieveCachedFile(inputFile.Path(), inputFile); outputFile != nil {
 		outputFile.CopyProps(inputFile)
 		context.DispatchFile(outputFile)
diff --git a/plugins/markdown/markdown.go b/plugins/markdown/markdown.go
index f7c6d17..80dc529 100644
--- a/plugins/markdown/markdown.go
+++ b/plugins/markdown/markdown.go
@@ -47,7 +47,7 @@ func (self *Markdown) Initialize(context *goldsmith.Context) error {
 	return nil
 }
 
-func (self *Markdown) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (self *Markdown) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	outputPath := strings.TrimSuffix(inputFile.Path(), path.Ext(inputFile.Path())) + ".html"
 	if outputFile := context.RetrieveCachedFile(outputPath, inputFile); outputFile != nil {
 		outputFile.CopyProps(inputFile)
diff --git a/plugins/minify/minify.go b/plugins/minify/minify.go
index d5c744d..97e0d8c 100644
--- a/plugins/minify/minify.go
+++ b/plugins/minify/minify.go
@@ -37,7 +37,7 @@ func (*Minify) Initialize(context *goldsmith.Context) error {
 	return nil
 }
 
-func (*Minify) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (*Minify) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	if outputFile := context.RetrieveCachedFile(inputFile.Path(), inputFile); outputFile != nil {
 		outputFile.CopyProps(inputFile)
 		context.DispatchFile(outputFile)
diff --git a/plugins/pager/pager.go b/plugins/pager/pager.go
index 365a3d5..b7f22fb 100644
--- a/plugins/pager/pager.go
+++ b/plugins/pager/pager.go
@@ -22,13 +22,13 @@ import (
 type Namer func(path string, index int) string
 
 // Lister callback function is used to return a metadata slice which should be paged across several files.
-type Lister func(file *goldsmith.File) interface{}
+type Lister func(file goldsmith.File) interface{}
 
 // Page represents information about a given metadata segment.
 type Page struct {
 	Index int
 	Items interface{}
-	File  *goldsmith.File
+	File  goldsmith.File
 
 	Next *Page
 	Prev *Page
@@ -51,7 +51,7 @@ type Pager struct {
 	inheritedKeys []string
 	itemsPerPage  int
 
-	files []*goldsmith.File
+	files []goldsmith.File
 	mutex sync.Mutex
 }
 
@@ -114,7 +114,7 @@ func (*Pager) Initialize(context *goldsmith.Context) error {
 	return nil
 }
 
-func (self *Pager) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (self *Pager) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	self.mutex.Lock()
 	defer self.mutex.Unlock()
 
@@ -208,7 +208,7 @@ func (self *Pager) Finalize(ctx *goldsmith.Context) error {
 	return nil
 }
 
-func (self *Pager) isEnabledForFile(file *goldsmith.File) (bool, error) {
+func (self *Pager) isEnabledForFile(file goldsmith.File) (bool, error) {
 	enableRaw, ok := file.Prop(self.enableKey)
 	if !ok {
 		return false, nil
diff --git a/plugins/pager/pager_test.go b/plugins/pager/pager_test.go
index 286f57c..28441ff 100644
--- a/plugins/pager/pager_test.go
+++ b/plugins/pager/pager_test.go
@@ -11,9 +11,9 @@ import (
 )
 
 func Test(self *testing.T) {
-	lister := func(file *goldsmith.File) interface{} {
+	lister := func(file goldsmith.File) interface{} {
 		if groupsRaw, ok := file.Prop("Groups"); ok {
-			if groups, ok := groupsRaw.(map[string][]*goldsmith.File); ok {
+			if groups, ok := groupsRaw.(map[string][]goldsmith.File); ok {
 				if group, ok := groups["group"]; ok {
 					return group
 				}
diff --git a/plugins/rule/rule.go b/plugins/rule/rule.go
index b42aa8b..ef8cf3c 100644
--- a/plugins/rule/rule.go
+++ b/plugins/rule/rule.go
@@ -1,7 +1,7 @@
 package rule
 
 import (
-	"io/ioutil"
+	"io"
 	"path/filepath"
 	"sync"
 
@@ -19,14 +19,14 @@ type rule struct {
 
 type ruleApply struct {
 	rule
-	Props map[string]goldsmith.Prop
+	Props map[string]goldsmith.FileProp
 }
 
 type ruleDrop struct {
 	rule
 }
 
-func (self *rule) accept(inputFile *goldsmith.File) bool {
+func (self *rule) accept(inputFile goldsmith.File) bool {
 	if !wildcard.New(filepath.Join(self.baseDir, "**")).Accept(inputFile) {
 		return false
 	}
@@ -52,7 +52,7 @@ func (self *rule) accept(inputFile *goldsmith.File) bool {
 	return operator.Not(wildcard.New(rejectPaths...)).Accept(inputFile)
 }
 
-func (self *ruleApply) apply(inputFile *goldsmith.File) {
+func (self *ruleApply) apply(inputFile goldsmith.File) {
 	if self.accept(inputFile) {
 		for name, value := range self.Props {
 			inputFile.SetProp(name, value)
@@ -60,7 +60,7 @@ func (self *ruleApply) apply(inputFile *goldsmith.File) {
 	}
 }
 
-func (self *ruleDrop) drop(inputFile *goldsmith.File) bool {
+func (self *ruleDrop) drop(inputFile goldsmith.File) bool {
 	return self.accept(inputFile)
 }
 
@@ -69,8 +69,8 @@ type ruleSet struct {
 	Drop  []*ruleDrop
 }
 
-func newRuleSet(inputFile *goldsmith.File) (*ruleSet, error) {
-	data, err := ioutil.ReadAll(inputFile)
+func newRuleSet(inputFile goldsmith.File) (*ruleSet, error) {
+	data, err := io.ReadAll(inputFile)
 	if err != nil {
 		return nil, err
 	}
@@ -91,7 +91,7 @@ func newRuleSet(inputFile *goldsmith.File) (*ruleSet, error) {
 	return &ruleSet, nil
 }
 
-func (self *ruleSet) process(inputFile *goldsmith.File) bool {
+func (self *ruleSet) process(inputFile goldsmith.File) bool {
 	for _, rule := range self.Apply {
 		rule.apply(inputFile)
 	}
@@ -110,7 +110,7 @@ type Rule struct {
 	filename string
 
 	ruleSets   []*ruleSet
-	inputFiles []*goldsmith.File
+	inputFiles []goldsmith.File
 	mutex      sync.Mutex
 }
 
@@ -128,7 +128,7 @@ func (*Rule) Name() string {
 	return "rule"
 }
 
-func (self *Rule) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (self *Rule) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	if inputFile.Name() == self.filename {
 		ruleSet, err := newRuleSet(inputFile)
 		if err != nil {
diff --git a/plugins/summary/summary.go b/plugins/summary/summary.go
index eb330b5..7fe74ca 100644
--- a/plugins/summary/summary.go
+++ b/plugins/summary/summary.go
@@ -62,7 +62,7 @@ func (*Summary) Initialize(context *goldsmith.Context) error {
 	return nil
 }
 
-func (self *Summary) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (self *Summary) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	doc, err := goquery.NewDocumentFromReader(inputFile)
 	if err != nil {
 		return err
diff --git a/plugins/syndicate/syndicate.go b/plugins/syndicate/syndicate.go
index e4a979e..83f3720 100644
--- a/plugins/syndicate/syndicate.go
+++ b/plugins/syndicate/syndicate.go
@@ -120,7 +120,7 @@ func (self *Syndicate) WithFeed(name string, config FeedConfig) *Syndicate {
 	return self
 }
 
-func (self *Syndicate) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (self *Syndicate) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	defer context.DispatchFile(inputFile)
 
 	getString := func(key string) string {
diff --git a/plugins/syntax/syntax.go b/plugins/syntax/syntax.go
index dd63665..32d35e3 100644
--- a/plugins/syntax/syntax.go
+++ b/plugins/syntax/syntax.go
@@ -74,7 +74,7 @@ func (*Syntax) Initialize(context *goldsmith.Context) error {
 	return nil
 }
 
-func (self *Syntax) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (self *Syntax) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	if outputFile := context.RetrieveCachedFile(inputFile.Path(), inputFile); outputFile != nil {
 		outputFile.CopyProps(inputFile)
 		context.DispatchFile(outputFile)
diff --git a/plugins/tags/tags.go b/plugins/tags/tags.go
index 49ee41d..a7e1826 100644
--- a/plugins/tags/tags.go
+++ b/plugins/tags/tags.go
@@ -18,7 +18,7 @@ import (
 // TagInfo contains site-wide information about a particular tag.
 type TagInfo struct {
 	TaggedFiles filesByPath
-	IndexFile   *goldsmith.File
+	IndexFile   goldsmith.File
 	SafeName    string
 	RawName     string
 }
@@ -44,7 +44,7 @@ type Tags struct {
 	infoByName  tagInfoByName
 	infoByCount tagInfoByCount
 
-	files []*goldsmith.File
+	files []goldsmith.File
 	mutex sync.Mutex
 }
 
@@ -98,7 +98,7 @@ func (*Tags) Initialize(context *goldsmith.Context) error {
 	return nil
 }
 
-func (self *Tags) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (self *Tags) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	tagState := &TagState{
 		TagsByName:  &self.infoByName,
 		TagsByCount: &self.infoByCount,
@@ -185,8 +185,8 @@ func (self *Tags) Finalize(context *goldsmith.Context) error {
 	return nil
 }
 
-func (self *Tags) buildPages(context *goldsmith.Context) ([]*goldsmith.File, error) {
-	var files []*goldsmith.File
+func (self *Tags) buildPages(context *goldsmith.Context) ([]goldsmith.File, error) {
+	var files []goldsmith.File
 	for tag, info := range self.info {
 		var err error
 		info.IndexFile, err = context.CreateFileFromReader(self.tagPagePath(tag), bytes.NewReader(nil))
@@ -273,7 +273,7 @@ func (self tagInfoByName) Less(i, j int) bool {
 	return false
 }
 
-type filesByPath []*goldsmith.File
+type filesByPath []goldsmith.File
 
 func (self filesByPath) Len() int {
 	return len(self)
diff --git a/plugins/thumbnail/thumbnail.go b/plugins/thumbnail/thumbnail.go
index 9f0eb17..d749721 100644
--- a/plugins/thumbnail/thumbnail.go
+++ b/plugins/thumbnail/thumbnail.go
@@ -81,7 +81,7 @@ func (*Thumbnail) Initialize(context *goldsmith.Context) error {
 	return nil
 }
 
-func (self *Thumbnail) Process(context *goldsmith.Context, inputFile *goldsmith.File) error {
+func (self *Thumbnail) Process(context *goldsmith.Context, inputFile goldsmith.File) error {
 	defer context.DispatchFile(inputFile)
 
 	thumbPath := self.namer(inputFile.Path(), self.size)
@@ -104,7 +104,7 @@ func (self *Thumbnail) Process(context *goldsmith.Context, inputFile *goldsmith.
 	return nil
 }
 
-func (self *Thumbnail) thumbnail(context *goldsmith.Context, inputFile *goldsmith.File, thumbPath string) (*goldsmith.File, error) {
+func (self *Thumbnail) thumbnail(context *goldsmith.Context, inputFile goldsmith.File, thumbPath string) (goldsmith.File, error) {
 	var thumbFormat imaging.Format
 	switch strings.ToLower(filepath.Ext(thumbPath)) {
 	case ".jpg", ".jpeg":