lib: guard inspector console using process var

Currently the inspector module is always loaded and if it does not
return anything the inspector console setup is skipped.

This commit uses the process.config.variables.v8_enable_inspector
variable to only load the inspector module if it is enabled.

PR-URL: #15008
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/internal/bootstrap_node.js

@@ -319,10 +319,10 @@
   }
 
   function setupInspector(originalConsole, wrappedConsole, Module) {
-    const { addCommandLineAPI, consoleCall } = process.binding('inspector');
-    if (!consoleCall) {
+    if (!process.config.variables.v8_enable_inspector) {
       return;
     }
+    const { addCommandLineAPI, consoleCall } = process.binding('inspector');
     // Setup inspector command line API
     const { makeRequireFunction } = NativeModule.require('internal/module');
     const path = NativeModule.require('path');

test/fixtures/overwrite-config-preload-module.js

@@ -0,0 +1,5 @@
+'use strict'
+const common = require('../common');
+common.skipIfInspectorDisabled();
+
+process.config = {};

test/sequential/test-inspector-overwrite-config.js

@@ -0,0 +1,41 @@
+// Flags: --require ./test/fixtures/overwrite-config-preload-module.js
+'use strict';
+
+// This test ensures that overwriting a process configuration
+// value does not affect code in bootstrap_node.js. Specifically this tests
+// that the inspector console functions are bound even though
+// overwrite-config-preload-module.js overwrote the process.config variable.
+
+// We cannot do a check for the inspector because the configuration variables
+// were reset/removed by overwrite-config-preload-module.js.
+/* eslint-disable inspector-check */
+
+const common = require('../common');
+const assert = require('assert');
+const inspector = require('inspector');
+const msg = 'Test inspector logging';
+let asserted = false;
+
+async function testConsoleLog() {
+  const session = new inspector.Session();
+  session.connect();
+  session.on('inspectorNotification', (data) => {
+    if (data.method === 'Runtime.consoleAPICalled') {
+      assert.strictEqual(data.params.args.length, 1);
+      assert.strictEqual(data.params.args[0].value, msg);
+      asserted = true;
+    }
+  });
+  session.post('Runtime.enable');
+  console.log(msg);
+  session.disconnect();
+}
+
+common.crashOnUnhandledRejection();
+
+async function runTests() {
+  await testConsoleLog();
+  assert.ok(asserted, 'log statement did not reach the inspector');
+}
+
+runTests();