1 files changed, 55 insertions, 0 deletions
diff --git a/lib/internal/process/esm_loader.js b/lib/internal/process/esm_loader.js
new file mode 100644
index 0000000000..e45c0faa18
--- /dev/null
+++ b/lib/internal/process/esm_loader.js
@@ -0,0 +1,55 @@
+'use strict';
+
+const { internalBinding } = require('internal/bootstrap/loaders');
+const {
+  setImportModuleDynamicallyCallback,
+  setInitializeImportMetaObjectCallback
+} = internalBinding('module_wrap');
+
+const { getURLFromFilePath } = require('internal/url');
+const Loader = require('internal/modules/esm/Loader');
+const path = require('path');
+const { URL } = require('url');
+
+function normalizeReferrerURL(referrer) {
+  if (typeof referrer === 'string' && path.isAbsolute(referrer)) {
+    return getURLFromFilePath(referrer).href;
+  }
+  return new URL(referrer).href;
+}
+
+function initializeImportMetaObject(wrap, meta) {
+  meta.url = wrap.url;
+}
+
+let loaderResolve;
+exports.loaderPromise = new Promise((resolve, reject) => {
+  loaderResolve = resolve;
+});
+
+exports.ESMLoader = undefined;
+
+exports.setup = function() {
+  setInitializeImportMetaObjectCallback(initializeImportMetaObject);
+
+  let ESMLoader = new Loader();
+  const loaderPromise = (async () => {
+    const userLoader = process.binding('config').userLoader;
+    if (userLoader) {
+      const hooks = await ESMLoader.import(
+        userLoader, getURLFromFilePath(`${process.cwd()}/`).href);
+      ESMLoader = new Loader();
+      ESMLoader.hook(hooks);
+      exports.ESMLoader = ESMLoader;
+    }
+    return ESMLoader;
+  })();
+  loaderResolve(loaderPromise);
+
+  setImportModuleDynamicallyCallback(async (referrer, specifier) => {
+    const loader = await loaderPromise;
+    return loader.import(specifier, normalizeReferrerURL(referrer));
+  });
+
+  exports.ESMLoader = ESMLoader;
+};