feat(esm): Import rather than require inspector (#10910)

This does break support for custom builds of Node which have been built
without inspector support. The only one that comes to mind is Vercel/pkg
but this has recently been deprecated since Node v21 supports building
single file executables.

We may come back later and find a way to work around this but we cannot
use async `import` with the current code, so we'll need to revisit this
after we have a proper ESM build working!

This also removes `local-variables-async.ts` since it's not used and
async inspector requires a worker thread to work.

Author: timfish

packages/node-experimental/src/integrations/anr/index.ts

@@ -1,6 +1,7 @@
 import { defineIntegration, getCurrentScope } from '@sentry/core';
 import type { Contexts, Event, EventHint, IntegrationFn } from '@sentry/types';
 import { logger } from '@sentry/utils';
+import * as inspector from 'inspector';
 import { Worker } from 'worker_threads';
 import { NODE_MAJOR, NODE_VERSION } from '../../nodeVersion';
 import type { NodeClient } from '../../sdk/client';
@@ -29,11 +30,6 @@ async function getContexts(client: NodeClient): Promise<Contexts> {
   return event?.contexts || {};
 }
 
-interface InspectorApi {
-  open: (port: number) => void;
-  url: () => string | undefined;
-}
-
 const INTEGRATION_NAME = 'Anr';
 
 const _anrIntegration = ((options: Partial<AnrIntegrationOptions> = {}) => {
@@ -90,8 +86,6 @@ async function _startWorker(client: NodeClient, _options: Partial<AnrIntegration
   };
 
   if (options.captureStackTrace) {
-    // eslint-disable-next-line @typescript-eslint/no-var-requires
-    const inspector: InspectorApi = require('inspector');
     if (!inspector.url()) {
       inspector.open(0);
     }

packages/node-experimental/src/integrations/anr/worker.ts

@@ -21,7 +21,6 @@ import { createGetModuleFromFilename } from '../../utils/module';
 import type { WorkerStartData } from './common';
 
 type VoidFunction = () => void;
-type InspectorSessionNodeV12 = InspectorSession & { connectToMainThread: VoidFunction };
 
 const options: WorkerStartData = workerData;
 let session: Session | undefined;
@@ -139,7 +138,7 @@ let debuggerPause: VoidFunction | undefined;
 if (options.captureStackTrace) {
   log('Connecting to debugger');
 
-  const session = new InspectorSession() as InspectorSessionNodeV12;
+  const session = new InspectorSession();
   session.connectToMainThread();
 
   log('Connected to debugger');