fix: off by one on hover

Author: bensengupta

packages/graphql-language-service/src/interface/__tests__/getHoverInformation.test.ts

@@ -30,14 +30,35 @@ describe('getHoverInformation', () => {
     return getHoverInformation(schema, query, point);
   }
 
-  it('provides leaf field information', () => {
-    const actual = testHover(
-      'query { thing { testField } }',
-      new Position(0, 20),
-    );
-    expect(actual).toEqual(
-      'TestType.testField: String\n\nThis is field documentation for TestType.testField',
-    );
+  describe('provides leaf field information', () => {
+    it('when in middle of token', () => {
+      const actual = testHover(
+        'query { thing { testField } }',
+        new Position(0, 20),
+      );
+      expect(actual).toEqual(
+        'TestType.testField: String\n\nThis is field documentation for TestType.testField',
+      );
+    });
+
+    it('when at start of token', () => {
+      const actual = testHover(
+        'query { thing { testField } }',
+        new Position(0, 16),
+      );
+      expect(actual).toEqual(
+        'TestType.testField: String\n\nThis is field documentation for TestType.testField',
+      );
+    });
+    it('when at end of token', () => {
+      const actual = testHover(
+        'query { thing { testField } }',
+        new Position(0, 24),
+      );
+      expect(actual).toEqual(
+        'TestType.testField: String\n\nThis is field documentation for TestType.testField',
+      );
+    });
   });
 
   it('provides aliased field information', () => {

packages/graphql-language-service/src/parser/api.ts

@@ -183,7 +183,7 @@ export function getContextAtPosition(
   mode: GraphQLDocumentMode;
 } | null {
   const token: ContextToken =
-    contextToken || getTokenAtPosition(queryText, cursor, 1);
+    contextToken || getTokenAtPosition(queryText, cursor, 0);
   if (!token) {
     return null;
   }