[WIP] reduce circular dependencies in ESM loader and move more essential modules into the snapshot

lib/internal/bootstrap/browser.js

@@ -42,9 +42,11 @@ defineOperation(globalThis, 'setTimeout', timers.setTimeout);
 exposeLazyInterfaces(globalThis, 'internal/abort_controller', [
   'AbortController', 'AbortSignal',
 ]);
-exposeLazyInterfaces(globalThis, 'internal/event_target', [
-  'EventTarget', 'Event',
-]);
+const {
+  EventTarget, Event,
+} = require('internal/event_target');
+exposeInterface(globalThis, 'Event', Event);
+exposeInterface(globalThis, 'EventTarget', EventTarget);
 exposeLazyInterfaces(globalThis, 'internal/worker/io', [
   'MessageChannel', 'MessagePort', 'MessageEvent',
 ]);

lib/internal/bootstrap/switches/is_main_thread.js

@@ -286,3 +286,31 @@ rawMethods.resetStdioForTesting = function() {
   stdout = undefined;
   stderr = undefined;
 };
+
+// Needed by the module loader and generally needed everywhere.
+require('fs');
+require('util');
+
+require('internal/modules/cjs/loader');
+require('internal/modules/esm/utils');
+require('internal/vm/module');
+// Needed to refresh the time origin.
+require('internal/perf/utils');
+// Needed to register the async hooks.
+if (internalBinding('config').hasInspector) {
+  require('internal/inspector_async_hook');
+}
+// Needed to set the wasm web API callbacks.
+internalBinding('wasm_web_api');
+// Needed to detect whether it's on main thread.
+internalBinding('worker');
+// Needed to setup source maps.
+require('internal/source_map/source_map_cache');
+// Needed by most execution modes.
+require('internal/modules/run_main');
+// Needed to refresh DNS configurations.
+require('internal/dns/utils');
+// Needed by almost all execution modes. It's fine to
+// load them into the snapshot as long as we don't run
+// any of the initialization.
+require('internal/process/pre_execution');

lib/internal/main/check_syntax.js

@@ -52,7 +52,7 @@ function loadESMIfNeeded(cb) {
   const hasModulePreImport = getOptionValue('--import').length > 0;
 
   if (hasModulePreImport) {
-    const { loadESM } = require('internal/process/esm_loader');
+    const { loadESM } = require('internal/modules/esm/cascaded_loader');
     loadESM(cb);
     return;
   }
@@ -65,7 +65,7 @@ async function checkSyntax(source, filename) {
     isModule = getOptionValue('--input-type') === 'module';
   } else {
     const { defaultResolve } = require('internal/modules/esm/resolve');
-    const { defaultGetFormat } = require('internal/modules/esm/get_format');
+    const { defaultGetFormat } = require('internal/modules/esm/utils');
     const { url } = await defaultResolve(pathToFileURL(filename).toString());
     const format = await defaultGetFormat(url);
     isModule = format === 'module';
@@ -77,7 +77,7 @@ async function checkSyntax(source, filename) {
     return;
   }
 
-  const { loadESM } = require('internal/process/esm_loader');
+  const { loadESM } = require('internal/modules/esm/cascaded_loader');
   const { handleMainPromise } = require('internal/modules/run_main');
   handleMainPromise(loadESM((loader) => wrapSafe(filename, source)));
 }

lib/internal/main/eval_string.js

@@ -14,7 +14,7 @@ const {
   markBootstrapComplete
 } = require('internal/process/pre_execution');
 const { evalModule, evalScript } = require('internal/process/execution');
-const { addBuiltinLibsToObject } = require('internal/modules/cjs/helpers');
+const { addBuiltinLibsToObject } = require('internal/modules/cjs/loader');
 
 const { getOptionValue } = require('internal/options');
 

lib/internal/main/repl.js

@@ -36,8 +36,7 @@ if (process.env.NODE_REPL_EXTERNAL_MODULE) {
     process.exit(kGenericUserError);
   }
 
-  const esmLoader = require('internal/process/esm_loader');
-  esmLoader.loadESM(() => {
+  require('internal/modules/esm/cascaded_loader').loadESM(() => {
     console.log(`Welcome to Node.js ${process.version}.\n` +
       'Type ".help" for more information.');