support registering hook in worker threads

lib/wrap.js

@@ -9,16 +9,16 @@ const { relay, send } = require('./ipc');
 const resolveMain = require('./resolve-main');
 const suppressExperimentalWarnings = require('./suppress-experimental-warnings');
 
-// Experimental warnings need to be suppressed in worker threads as well, since
-// their process inherits the Node arguments from the main thread.
 suppressExperimentalWarnings(process);
 
-// When using worker threads, each thread appears to require this file through
-// the shared Node arguments (--require), so filter them out here and only run
-// on the main thread.
-if (!isMainThread) return;
+if (isMainThread) {
+  // When using worker threads, each thread inherits execArgv and re-evaulates
+  // --require scripts. Worker threads do not inherit argv, so we copy argv[1]
+  // to the environment for those processes to use.
+  process.env.NODE_DEV_SCRIPT = process.argv[1];
+}
 
-const script = process.argv[1];
+const script = process.env.NODE_DEV_SCRIPT;
 const { extensions, fork, vm } = getConfig(script);
 
 if (process.env.NODE_DEV_PRELOAD) {