diff --git a/internal/lsp/cache/errors.go b/internal/lsp/cache/errors.go
index f910fc1e02..46edd90539 100644
--- a/internal/lsp/cache/errors.go
+++ b/internal/lsp/cache/errors.go
@@ -177,7 +177,7 @@ func toSourceErrorKind(kind packages.ErrorKind) source.ErrorKind {
 
 func typeErrorRange(ctx context.Context, fset *token.FileSet, pkg *pkg, pos token.Pos) (span.Span, error) {
 	posn := fset.Position(pos)
-	ph, _, err := findFileInPackage(pkg, span.FileURI(posn.Filename))
+	ph, _, err := source.FindFileInPackage(pkg, span.FileURI(posn.Filename))
 	if err != nil {
 		return span.Span{}, err
 	}
@@ -213,7 +213,7 @@ func typeErrorRange(ctx context.Context, fset *token.FileSet, pkg *pkg, pos toke
 }
 
 func scannerErrorRange(ctx context.Context, fset *token.FileSet, pkg *pkg, posn token.Position) (span.Span, error) {
-	ph, _, err := findFileInPackage(pkg, span.FileURI(posn.Filename))
+	ph, _, err := source.FindFileInPackage(pkg, span.FileURI(posn.Filename))
 	if err != nil {
 		return span.Span{}, err
 	}
@@ -232,7 +232,7 @@ func scannerErrorRange(ctx context.Context, fset *token.FileSet, pkg *pkg, posn
 // spanToRange converts a span.Span to a protocol.Range,
 // assuming that the span belongs to the package whose diagnostics are being computed.
 func spanToRange(ctx context.Context, pkg *pkg, spn span.Span) (protocol.Range, error) {
-	ph, _, err := findFileInPackage(pkg, spn.URI())
+	ph, _, err := source.FindFileInPackage(pkg, spn.URI())
 	if err != nil {
 		return protocol.Range{}, err
 	}
@@ -243,27 +243,6 @@ func spanToRange(ctx context.Context, pkg *pkg, spn span.Span) (protocol.Range,
 	return m.Range(spn)
 }
 
-func findFileInPackage(pkg source.Package, uri span.URI) (source.ParseGoHandle, source.Package, error) {
-	queue := []source.Package{pkg}
-	seen := make(map[string]bool)
-
-	for len(queue) > 0 {
-		pkg := queue[0]
-		queue = queue[1:]
-		seen[pkg.ID()] = true
-
-		if f, err := pkg.File(uri); err == nil {
-			return f, pkg, nil
-		}
-		for _, dep := range pkg.Imports() {
-			if !seen[dep.ID()] {
-				queue = append(queue, dep)
-			}
-		}
-	}
-	return nil, nil, errors.Errorf("no file for %s in package %s", uri, pkg.ID())
-}
-
 // parseGoListError attempts to parse a standard `go list` error message
 // by stripping off the trailing error message.
 //
diff --git a/internal/lsp/source/hover.go b/internal/lsp/source/hover.go
index 586e817ecf..57b10a4385 100644
--- a/internal/lsp/source/hover.go
+++ b/internal/lsp/source/hover.go
@@ -89,7 +89,7 @@ func (i *IdentifierInfo) linkAndSymbolName() (string, string) {
 	// package's API). This is true if the request originated in a test package,
 	// and if the declaration is also found in the same test package.
 	if i.pkg != nil && obj.Pkg() != nil && i.pkg.ForTest() != "" {
-		if _, pkg, _ := findFileInPackage(i.pkg, i.Declaration.URI()); i.pkg == pkg {
+		if _, pkg, _ := FindFileInPackage(i.pkg, i.Declaration.URI()); i.pkg == pkg {
 			return "", ""
 		}
 	}
diff --git a/internal/lsp/source/util.go b/internal/lsp/source/util.go
index 34e63176f2..ff0d2be112 100644
--- a/internal/lsp/source/util.go
+++ b/internal/lsp/source/util.go
@@ -637,7 +637,7 @@ func findPosInPackage(v View, searchpkg Package, pos token.Pos) (*ast.File, Pack
 	if v.Ignore(uri) {
 		ph, err = findIgnoredFile(v, uri)
 	} else {
-		ph, pkg, err = findFileInPackage(searchpkg, uri)
+		ph, pkg, err = FindFileInPackage(searchpkg, uri)
 	}
 	if err != nil {
 		return nil, nil, err
@@ -661,7 +661,7 @@ func findMapperInPackage(v View, searchpkg Package, uri span.URI) (*protocol.Col
 	if v.Ignore(uri) {
 		ph, err = findIgnoredFile(v, uri)
 	} else {
-		ph, _, err = findFileInPackage(searchpkg, uri)
+		ph, _, err = FindFileInPackage(searchpkg, uri)
 	}
 	if err != nil {
 		return nil, err
@@ -681,7 +681,8 @@ func findIgnoredFile(v View, uri span.URI) (ParseGoHandle, error) {
 	return v.Session().Cache().ParseGoHandle(fh, ParseFull), nil
 }
 
-func findFileInPackage(pkg Package, uri span.URI) (ParseGoHandle, Package, error) {
+// FindFileInPackage finds uri in pkg or its dependencies.
+func FindFileInPackage(pkg Package, uri span.URI) (ParseGoHandle, Package, error) {
 	queue := []Package{pkg}
 	seen := make(map[string]bool)