fix(amazonq): chat may hang in ts/js files #4954

Problem
Q chat may hang when processing fragments of ts/js code. The
Tsx.findNames and Tsx.findNamesWithInExtent functions hang (Promise does
not resolve). These functions invoke WASM/rust code.

- #4935
- #4810

Solution
Remove uses of Tsx.findNames and Tsx.findNamesWithInExtent.

The fully qualified names (FQN) library is used to help service build
prompts with variable names in user's IDE to reduce hallucinations, but
they are not required for normal functionality.

Author: leigaol

packages/amazonq/.changes/next-release/Bug Fix-1a8a24b4-8845-4955-84a5-895eaed1194e.json

@@ -0,0 +1,4 @@
+{
+	"type": "Bug Fix",
+	"description": "Q chat may stop responding after processing Javascript/Typescript code"
+}

packages/core/src/codewhispererChat/editor/context/file/importReader.ts

@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { Java, Python, TypeScript, Tsx } from '@aws/fully-qualified-names'
+import { Java, Python } from '@aws/fully-qualified-names'
 import { extractContextFromJavaImports } from './javaImportReader'
 
 export async function readImports(text: string, languageId: string): Promise<string[]> {
@@ -15,14 +15,16 @@ export async function readImports(text: string, languageId: string): Promise<str
         case 'javascript':
         case 'javascriptreact':
         case 'typescriptreact':
-            names = await Tsx.findNames(text)
-            break
+            // Disable Tsx.findNames because promise Tsx.findNames
+            // may not resolve and can cause chat to hang
+            //names = await Tsx.findNames(text)
+            return []
         case 'python':
             names = await Python.findNames(text)
             break
         case 'typescript':
-            names = await TypeScript.findNames(text)
-            break
+            //names = await TypeScript.findNames(text)
+            return []
     }
     if (names.fullyQualified === undefined) {
         return []

packages/core/src/codewhispererChat/editor/context/focusArea/focusAreaExtractor.ts

@@ -5,7 +5,7 @@
 
 import { TextEditor, Selection, TextDocument, Range } from 'vscode'
 
-import { Extent, Java, Python, Tsx, TypeScript, Location } from '@aws/fully-qualified-names'
+import { Extent, Java, Python, Location } from '@aws/fully-qualified-names'
 import { FocusAreaContext, FullyQualifiedName } from './model'
 
 const focusAreaCharLimit = 9_000
@@ -235,13 +235,17 @@ export class FocusAreaContextExtractor {
             case 'javascript':
             case 'javascriptreact':
             case 'typescriptreact':
-                names = await Tsx.findNamesWithInExtent(fileText, extent)
+                // Disable Tsx.findNamesWithInExtent because promise Tsx.findNamesWithInExtent
+                // may not resolve and can cause chat to hang
+                //names = await Tsx.findNamesWithInExtent(fileText, extent)
+                names = undefined
                 break
             case 'python':
                 names = await Python.findNamesWithInExtent(fileText, extent)
                 break
             case 'typescript':
-                names = await TypeScript.findNamesWithInExtent(fileText, extent)
+                //names = await TypeScript.findNamesWithInExtent(fileText, extent)
+                names = undefined
                 break
         }