diff --git a/src/services/search/expressions/and.js b/src/services/search/expressions/and.js
index 3d510ac25..e853318b9 100644
--- a/src/services/search/expressions/and.js
+++ b/src/services/search/expressions/and.js
@@ -1,7 +1,7 @@
 "use strict";
 
 const Expression = require('./expression');
-const TrueExp = require('./true.js');
+const TrueExp = require('./true');
 
 class AndExp extends Expression {
     static of(subExpressions) {
diff --git a/src/services/search/expressions/or.js b/src/services/search/expressions/or.js
index 529320724..adf9b4fe3 100644
--- a/src/services/search/expressions/or.js
+++ b/src/services/search/expressions/or.js
@@ -2,7 +2,7 @@
 
 const Expression = require('./expression');
 const NoteSet = require('../note_set');
-const TrueExp = require('./true.js');
+const TrueExp = require('./true');
 
 class OrExp extends Expression {
     static of(subExpressions) {
diff --git a/src/services/search/expressions/true.js b/src/services/search/expressions/true.js
deleted file mode 100644
index fd685cc17..000000000
--- a/src/services/search/expressions/true.js
+++ /dev/null
@@ -1,11 +0,0 @@
-"use strict";
-
-const Expression = require('./expression');
-
-class TrueExp extends Expression {
-    execute(inputNoteSet, executionContext, searchContext) {
-        return inputNoteSet;
-    }
-}
-
-module.exports = TrueExp;
diff --git a/src/services/search/expressions/true.ts b/src/services/search/expressions/true.ts
new file mode 100644
index 000000000..a53d1afde
--- /dev/null
+++ b/src/services/search/expressions/true.ts
@@ -0,0 +1,14 @@
+"use strict";
+
+import NoteSet = require("../note_set");
+import SearchContext = require("../search_context");
+
+import Expression = require('./expression');
+
+class TrueExp extends Expression {
+    execute(inputNoteSet: NoteSet, executionContext: {}, searchContext: SearchContext): NoteSet {
+        return inputNoteSet;
+    }
+}
+
+export = TrueExp;
diff --git a/src/services/search/services/parse.js b/src/services/search/services/parse.js
index 17f0844ca..9edb4bb87 100644
--- a/src/services/search/services/parse.js
+++ b/src/services/search/services/parse.js
@@ -18,7 +18,7 @@ const AncestorExp = require('../expressions/ancestor');
 const buildComparator = require('./build_comparator.js');
 const ValueExtractor = require('../value_extractor');
 const utils = require('../../utils');
-const TrueExp = require('../expressions/true.js');
+const TrueExp = require('../expressions/true');
 const IsHiddenExp = require('../expressions/is_hidden.js');
 
 function getFulltext(tokens, searchContext) {