src: rename --loader to --experimental-loader

Renames the `--loader` cli argument to `--experimental-loader`.  This is
to clearly indicate the esm loader feature as experimental even after
esm is no longer experimental.

Also minorly alters the `--experimental-loader` docs to say that the
passed loader can be an esm module.

Refs: https://github.com/nodejs/modules/issues/351#issuecomment-535189524

PR-URL: https://github.com/nodejs/node/pull/29752
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/lib/internal/bootstrap/pre_execution.js b/lib/internal/bootstrap/pre_execution.js
index 6e7d946458..cab2d47c8e 100644
--- a/lib/internal/bootstrap/pre_execution.js
+++ b/lib/internal/bootstrap/pre_execution.js
@@ -400,12 +400,12 @@ function initializeESMLoader() {
     // track of for different ESM modules.
     setInitializeImportMetaObjectCallback(esm.initializeImportMetaObject);
     setImportModuleDynamicallyCallback(esm.importModuleDynamicallyCallback);
-    const userLoader = getOptionValue('--loader');
-    // If --loader is specified, create a loader with user hooks. Otherwise
-    // create the default loader.
+    const userLoader = getOptionValue('--experimental-loader');
+    // If --experimental-loader is specified, create a loader with user hooks.
+    // Otherwise create the default loader.
     if (userLoader) {
       const { emitExperimentalWarning } = require('internal/util');
-      emitExperimentalWarning('--loader');
+      emitExperimentalWarning('--experimental-loader');
     }
     esm.initializeLoader(process.cwd(), userLoader);
   }