use directories for structure

node_modules/source-map-support/source-map-support.js

@@ -14,6 +14,16 @@ try {
 
 var bufferFrom = require('buffer-from');
 
+/**
+ * Requires a module which is protected against bundler minification.
+ *
+ * @param {NodeModule} mod
+ * @param {string} request
+ */
+function dynamicRequire(mod, request) {
+  return mod.require(request);
+}
+
 // Only install once if called multiple times
 var errorFormatterInstalled = false;
 var uncaughtShimInstalled = false;
@@ -526,12 +536,8 @@ exports.install = function(options) {
 
   // Support runtime transpilers that include inline source maps
   if (options.hookRequire && !isInBrowser()) {
-    var Module;
-    try {
-      Module = require('module');
-    } catch (err) {
-      // NOP: Loading in catch block to convert webpack error to warning.
-    }
+    // Use dynamicRequire to avoid including in browser bundles
+    var Module = dynamicRequire(module, 'module');
     var $compile = Module.prototype._compile;
 
     if (!$compile.__sourceMapSupport) {
@@ -561,6 +567,17 @@ exports.install = function(options) {
     var installHandler = 'handleUncaughtExceptions' in options ?
       options.handleUncaughtExceptions : true;
 
+    // Do not override 'uncaughtException' with our own handler in Node.js
+    // Worker threads. Workers pass the error to the main thread as an event,
+    // rather than printing something to stderr and exiting.
+    try {
+      // We need to use `dynamicRequire` because `require` on it's own will be optimized by WebPack/Browserify.
+      var worker_threads = dynamicRequire(module, 'worker_threads');
+      if (worker_threads.isMainThread === false) {
+        installHandler = false;
+      }
+    } catch(e) {}
+
     // Provide the option to not install the uncaught exception handler. This is
     // to support other uncaught exception handlers (in test frameworks, for
     // example). If this handler is not installed and there are no other uncaught