diff --git a/src/services/search/expressions/relation_where.js b/src/services/search/expressions/relation_where.ts
similarity index 72%
rename from src/services/search/expressions/relation_where.js
rename to src/services/search/expressions/relation_where.ts
index 33d4e8f59..9f33dcecf 100644
--- a/src/services/search/expressions/relation_where.js
+++ b/src/services/search/expressions/relation_where.ts
@@ -1,18 +1,22 @@
 "use strict";
 
-const Expression = require('./expression');
-const NoteSet = require('../note_set');
-const becca = require('../../../becca/becca');
+import Expression = require('./expression');
+import NoteSet = require('../note_set');
+import becca = require('../../../becca/becca');
+import SearchContext = require('../search_context');
 
 class RelationWhereExp extends Expression {
-    constructor(relationName, subExpression) {
+    private relationName: string;
+    private subExpression: Expression;
+
+    constructor(relationName: string, subExpression: Expression) {
         super();
 
         this.relationName = relationName;
         this.subExpression = subExpression;
     }
 
-    execute(inputNoteSet, executionContext, searchContext) {
+    execute(inputNoteSet: NoteSet, executionContext: {}, searchContext: SearchContext) {
         const candidateNoteSet = new NoteSet();
 
         for (const attr of becca.findAttributes('relation', this.relationName)) {
@@ -38,4 +42,4 @@ class RelationWhereExp extends Expression {
     }
 }
 
-module.exports = RelationWhereExp;
+export = RelationWhereExp;
diff --git a/src/services/search/services/parse.js b/src/services/search/services/parse.js
index 28d6b6afe..869046236 100644
--- a/src/services/search/services/parse.js
+++ b/src/services/search/services/parse.js
@@ -7,7 +7,7 @@ const NotExp = require('../expressions/not');
 const ChildOfExp = require('../expressions/child_of');
 const DescendantOfExp = require('../expressions/descendant_of');
 const ParentOfExp = require('../expressions/parent_of');
-const RelationWhereExp = require('../expressions/relation_where.js');
+const RelationWhereExp = require('../expressions/relation_where');
 const PropertyComparisonExp = require('../expressions/property_comparison.js');
 const AttributeExistsExp = require('../expressions/attribute_exists');
 const LabelComparisonExp = require('../expressions/label_comparison');