diff --git a/d2lsp/d2lsp.go b/d2lsp/d2lsp.go
index 6704fdd6d..f233d43b5 100644
--- a/d2lsp/d2lsp.go
+++ b/d2lsp/d2lsp.go
@@ -2,7 +2,6 @@
 package d2lsp
 
 import (
-	"errors"
 	"fmt"
 	"strings"
 
@@ -11,11 +10,11 @@ import (
 	"oss.terrastruct.com/d2/lib/memfs"
 )
 
-func GetFieldRefs(path string, fs map[string]string, key string) (refs []d2ir.Reference, _ error) {
-	if _, ok := fs["index"]; !ok {
-		return nil, errors.New("index not found")
+func GetFieldRefs(path, index string, fs map[string]string, key string) (refs []d2ir.Reference, _ error) {
+	if _, ok := fs[index]; !ok {
+		return nil, fmt.Errorf(`"%s" not found`, index)
 	}
-	r := strings.NewReader(fs["index"])
+	r := strings.NewReader(fs[index])
 	ast, err := d2parser.Parse(path, r, nil)
 	if err != nil {
 		return nil, err
@@ -46,7 +45,7 @@ func GetFieldRefs(path string, fs map[string]string, key string) (refs []d2ir.Re
 	for _, p := range mk.Key.Path {
 		f = curr.GetField(p.Unbox().ScalarString())
 		if f == nil {
-			return nil, fmt.Errorf(`"%s" not found`, key)
+			return nil, nil
 		}
 		curr = f.Map()
 	}
diff --git a/d2lsp/d2lsp_test.go b/d2lsp/d2lsp_test.go
index d5790ea25..2562339f5 100644
--- a/d2lsp/d2lsp_test.go
+++ b/d2lsp/d2lsp_test.go
@@ -13,17 +13,46 @@ x.a
 a.x
 x -> y`
 	fs := map[string]string{
-		"index": script,
+		"index.d2": script,
 	}
-	refs, err := d2lsp.GetFieldRefs("", fs, "x")
+	refs, err := d2lsp.GetFieldRefs("", "index.d2", fs, "x")
 	assert.Success(t, err)
 	assert.Equal(t, 3, len(refs))
 	assert.Equal(t, 0, refs[0].AST().GetRange().Start.Line)
 	assert.Equal(t, 1, refs[1].AST().GetRange().Start.Line)
 	assert.Equal(t, 3, refs[2].AST().GetRange().Start.Line)
 
-	refs, err = d2lsp.GetFieldRefs("", fs, "a.x")
+	refs, err = d2lsp.GetFieldRefs("", "index.d2", fs, "a.x")
 	assert.Success(t, err)
 	assert.Equal(t, 1, len(refs))
 	assert.Equal(t, 2, refs[0].AST().GetRange().Start.Line)
 }
+
+func TestGetRefsImported(t *testing.T) {
+	fs := map[string]string{
+		"index.d2": `
+...@ok
+hi
+`,
+		"ok.d2": `
+okay
+`,
+	}
+	refs, err := d2lsp.GetFieldRefs("", "index.d2", fs, "hi")
+	assert.Success(t, err)
+	assert.Equal(t, 1, len(refs))
+	assert.Equal(t, 2, refs[0].AST().GetRange().Start.Line)
+
+	refs, err = d2lsp.GetFieldRefs("", "index.d2", fs, "okay")
+	assert.Success(t, err)
+	assert.Equal(t, 1, len(refs))
+	assert.Equal(t, "ok.d2", refs[0].AST().GetRange().Path)
+
+	refs, err = d2lsp.GetFieldRefs("", "ok.d2", fs, "hi")
+	assert.Success(t, err)
+	assert.Equal(t, 0, len(refs))
+
+	refs, err = d2lsp.GetFieldRefs("", "ok.d2", fs, "okay")
+	assert.Success(t, err)
+	assert.Equal(t, 1, len(refs))
+}
diff --git a/lib/memfs/memfs.go b/lib/memfs/memfs.go
index 140512b3a..ed594540b 100644
--- a/lib/memfs/memfs.go
+++ b/lib/memfs/memfs.go
@@ -4,6 +4,7 @@ package memfs
 
 import (
 	"errors"
+	"io"
 	"io/fs"
 	"path"
 	"path/filepath"
@@ -42,14 +43,35 @@ func (mfs *MemoryFS) addFile(p string, content []byte, isDir bool) {
 	}
 }
 
+type MemoryFileHandle struct {
+	*MemoryFile
+	offset int
+}
+
 func (mfs *MemoryFS) Open(name string) (fs.File, error) {
 	file, ok := mfs.files[filepath.Clean(name)]
 	if !ok {
 		return nil, fs.ErrNotExist
 	}
-	return file, nil
+	return &MemoryFileHandle{MemoryFile: file}, nil
 }
 
+func (fh *MemoryFileHandle) Stat() (fs.FileInfo, error) { return fh.MemoryFile, nil }
+
+func (fh *MemoryFileHandle) Read(b []byte) (int, error) {
+	if fh.isDir {
+		return 0, errors.New("cannot read a directory")
+	}
+	if fh.offset >= len(fh.content) {
+		return 0, io.EOF
+	}
+	n := copy(b, fh.content[fh.offset:])
+	fh.offset += n
+	return n, nil
+}
+
+func (fh *MemoryFileHandle) Close() error { return nil }
+
 func (mf *MemoryFile) Stat() (fs.FileInfo, error) { return mf, nil }
 func (mf *MemoryFile) Read(b []byte) (int, error) {
 	if mf.isDir {