doc: clarify required flag for extensionless esm

Fixes: nodejs#30655
azz · Nov 26, 2019 · e622474 · e622474
1 parent 00e2276
commit e622474
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/doc/api/esm.md b/doc/api/esm.md
@@ -92,6 +92,9 @@ if the nearest parent `package.json` contains `"type": "module"`.
 ```js
 // my-app.js, part of the same example as above
 import './startup.js'; // Loaded as ES module because of package.json
+
+// Extensionless. Requires 'node --es-module-specifier-resolution=node'
+import './startup'; // Loaded as ES module because of package.json
 ```
 
 Package authors should include the `"type"` field, even in packages where all