fix(aws-cdk-lib): construct error stack trace hides namespaced package name

We take efforts to condense a construct library stack trace to make it
more comprehensible. This fixes two issues:

- Only the first part of a namespaced package name would be captured
- The stack trace looks confusing if it's too short to contain user
  code.

Old:

```
    ...aws-cdk-lib, @aws-cdk...
```

New:

```
    ...aws-cdk-lib, @aws-cdk/aws-lambda-python-alpha...
    (no user code in 10 frames, use --stack-trace-limit to capture more)
```

Author: rix0rrr

packages/aws-cdk-lib/core/lib/stack-trace.ts

@@ -136,11 +136,15 @@ export function parseErrorStack(stack: string): CallSite[] {
  * - If there is 'node:' in the file path, we assume it is NodeJS internals and we skip it.
  */
 export function renderCallStackJustMyCode(stack: CallSite[], indent = true): string[] {
-  const moduleRe = /(\/|\\)node_modules(\/|\\)([^/\\]+)/;
+  // Look for `/node_modules/` followed by either
+  // - An @ sign, and 2 path segments
+  // - No @ sign, and 1 path segment
+  const moduleRe = /(\/|\\)node_modules(\/|\\)(@[^/\\]+[/\\][^/\\]+|[^@][^/\\]*)/;
 
   const lines = [];
   let skipped = new Array<{ functionName?: string; fileName: string }>();
 
+  let sawMyCode = false;
   let i = 0;
   while (i < stack.length) {
     const frame = stack[i++];
@@ -161,9 +165,15 @@ export function renderCallStackJustMyCode(stack: CallSite[], indent = true): str
       reportSkipped(true);
       const prefix = indent ? '    at ' : '';
       lines.push(`${prefix}${frame.functionName} (${frame.fileName}:${frame.sourceLocation})`);
+      sawMyCode = true;
     }
   }
   reportSkipped(false);
+
+  if (!sawMyCode) {
+    lines.push(`${indent ? '    ' : ''}(no user code in ${Error.stackTraceLimit} frames, use --stack-trace-limit to capture more)`);
+  }
+
   return lines;
 
   function skip(what: typeof skipped[number]) {

packages/aws-cdk-lib/core/test/stack-trace.test.ts

@@ -0,0 +1,72 @@
+import { renderCallStackJustMyCode } from '../lib';
+
+describe('renderCallStackJustMyCode', () => {
+  test('renders namespaced packages correctly', () => {
+    const stack: Parameters<typeof renderCallStackJustMyCode>[0] = [
+      {
+        fileName: '/path/to/project/node_modules/aws-cdk-lib/core/lib/asset-staging.js',
+        functionName: 'AssetStaging.bundle',
+        sourceLocation: '2:512',
+      },
+      {
+        fileName: '/path/to/project/node_modules/aws-cdk-lib/aws-lambda/lib/function.js',
+        functionName: 'new Function2',
+        sourceLocation: '1:16236',
+      },
+      {
+        fileName: '/path/to/project/node_modules/aws-cdk-lib/core/lib/prop-injectable.js',
+        functionName: 'new Function2',
+        sourceLocation: '1:726',
+      },
+      {
+        fileName:
+          '/path/to/project/node_modules/@aws-cdk/aws-lambda-python-alpha/lib/function.ts',
+        functionName: 'new PythonFunction',
+        sourceLocation: '70:5',
+      },
+      {
+        fileName:
+          '/path/to/project/myfile.js',
+        functionName: 'new PythonFunction',
+        sourceLocation: '70:5',
+      },
+    ];
+
+    expect(renderCallStackJustMyCode(stack, false)).toEqual([
+      '...aws-cdk-lib, new PythonFunction in @aws-cdk/aws-lambda-python-alpha...',
+      'new PythonFunction (/path/to/project/myfile.js:70:5)',
+    ]);
+  });
+
+  test('adds a hint if there are not enough stack frames to see Just My Code', () => {
+    const stack: Parameters<typeof renderCallStackJustMyCode>[0] = [
+      {
+        fileName: '/path/to/project/node_modules/aws-cdk-lib/core/lib/asset-staging.js',
+        functionName: 'AssetStaging.bundle',
+        sourceLocation: '2:512',
+      },
+      {
+        fileName: '/path/to/project/node_modules/aws-cdk-lib/aws-lambda/lib/function.js',
+        functionName: 'new Function2',
+        sourceLocation: '1:16236',
+      },
+      {
+        fileName: '/path/to/project/node_modules/aws-cdk-lib/core/lib/prop-injectable.js',
+        functionName: 'new Function2',
+        sourceLocation: '1:726',
+      },
+      {
+        fileName:
+          '/path/to/project/node_modules/@aws-cdk/aws-lambda-python-alpha/lib/function.ts',
+        functionName: 'new PythonFunction',
+        sourceLocation: '70:5',
+      },
+    ];
+
+    expect(renderCallStackJustMyCode(stack, false)).toEqual([
+      '...aws-cdk-lib, new PythonFunction in @aws-cdk/aws-lambda-python-alpha...',
+      'new PythonFunction (/path/to/project/myfile.js:70:5)',
+      expect.stringContaining('use --stack-trace-limit to capture more'),
+    ]);
+  });
+});