fix: skip config updates when no custom filename is defined

.changeset/itchy-peaches-return.md

@@ -0,0 +1,5 @@
+---
+'graphql-language-service-server': patch
+---
+
+fix: skip config updates when no custom filename is defined

packages/graphql-language-service-server/package.json

@@ -44,6 +44,7 @@
   "devDependencies": {
     "@types/mkdirp": "^1.0.1",
     "cross-env": "^7.0.2",
-    "graphql": "experimental-stream-defer"
+    "graphql": "experimental-stream-defer",
+    "vscode-languageserver-protocol": "^3.15.3"
   }
 }

packages/graphql-language-service-server/src/MessageProcessor.ts

@@ -564,11 +564,12 @@ export class MessageProcessor {
           throw Error('No cache available for handleWatchedFilesChanged');
         }
         // update when graphql config changes!
-        if (
-          ['graphql.config', 'graphqlrc', this._settings.load.fileName].some(
-            v => change.uri.match(v)?.length,
-          )
-        ) {
+        const configMatchers = [
+          'graphql.config',
+          'graphqlrc',
+          this._settings.load.fileName,
+        ].filter(Boolean);
+        if (configMatchers.some(v => change.uri.match(v)?.length)) {
           this._logger.info('updating graphql config');
           this._updateGraphQLConfig();
         }

packages/graphql-language-service-server/src/__tests__/MessageProcessor-test.ts

@@ -8,6 +8,7 @@
  */
 import { tmpdir } from 'os';
 import { SymbolKind } from 'vscode-languageserver';
+import { FileChangeType } from 'vscode-languageserver-protocol';
 import { Position, Range } from 'graphql-language-service-utils';
 
 import { MessageProcessor } from '../MessageProcessor';
@@ -24,7 +25,10 @@ import type { DefinitionQueryResult, Outline } from 'graphql-language-service';
 import { Logger } from '../Logger';
 import { pathToFileURL } from 'url';
 
-const baseConfig = { dirpath: __dirname };
+jest.mock('fs', () => ({
+  ...jest.requireActual<typeof import('fs')>('fs'),
+  readFileSync: jest.fn(jest.requireActual('fs').readFileSync),
+}));
 
 describe('MessageProcessor', () => {
   const logger = new Logger(tmpdir());
@@ -48,6 +52,7 @@ describe('MessageProcessor', () => {
   beforeEach(async () => {
     const gqlConfig = await loadConfig({ rootDir: __dirname, extensions: [] });
     // loadConfig.mockRestore();
+    messageProcessor._settings = { load: {} };
     messageProcessor._graphQLCache = new GraphQLCache({
       configDir: __dirname,
       config: gqlConfig,
@@ -422,4 +427,55 @@ export function Example(arg: string) {}`;
     const contents = parseDocument(text, 'test.js');
     expect(contents.length).toEqual(0);
   });
+
+  describe('handleWatchedFilesChangedNotification', () => {
+    const mockReadFileSync: jest.Mock = jest.requireMock('fs').readFileSync;
+
+    beforeEach(() => {
+      mockReadFileSync.mockReturnValue('');
+      messageProcessor._updateGraphQLConfig = jest.fn();
+    });
+
+    it('skips config updates for normal file changes', async () => {
+      await messageProcessor.handleWatchedFilesChangedNotification({
+        changes: [
+          {
+            uri: `${pathToFileURL('.')}/foo.graphql`,
+            type: FileChangeType.Changed,
+          },
+        ],
+      });
+
+      expect(messageProcessor._updateGraphQLConfig).not.toHaveBeenCalled();
+    });
+
+    it('updates config for standard config filename changes', async () => {
+      await messageProcessor.handleWatchedFilesChangedNotification({
+        changes: [
+          {
+            uri: `${pathToFileURL('.')}/.graphql.config`,
+            type: FileChangeType.Changed,
+          },
+        ],
+      });
+
+      expect(messageProcessor._updateGraphQLConfig).toHaveBeenCalled();
+    });
+
+    it('updates config for custom config filename changes', async () => {
+      const customConfigName = 'custom-config-name.yml';
+      messageProcessor._settings = { load: { fileName: customConfigName } };
+
+      await messageProcessor.handleWatchedFilesChangedNotification({
+        changes: [
+          {
+            uri: `${pathToFileURL('.')}/${customConfigName}`,
+            type: FileChangeType.Changed,
+          },
+        ],
+      });
+
+      expect(messageProcessor._updateGraphQLConfig).toHaveBeenCalled();
+    });
+  });
 });