Fix tests

Author: timfish

packages/node/src/integrations/contextlines.ts

@@ -10,8 +10,6 @@ import { NodeClient } from '../client';
 const FILE_CONTENT_CACHE = new LRUMap<string, string | null>(100);
 const DEFAULT_LINES_OF_CONTEXT = 7;
 
-const readFileAsync = promisify(readFile);
-
 /**
  * Resets the file cache. Exists for testing purposes.
  * @hidden
@@ -120,7 +118,7 @@ async function readSourceFiles(filenames: Set<string>): Promise<Record<string, s
 
     let content: string | null = null;
     try {
-      content = await readFileAsync(filename, { encoding: 'utf8' });
+      content = await promisify(readFile)(filename, { encoding: 'utf8' });
     } catch (_) {
       //
     }