feat: support subpaths in npm package references (#15578)

cli/node/mod.rs

@@ -204,7 +204,11 @@ pub fn node_resolve_npm_reference(
     .resolve_package_from_deno_module(&reference.req)?
     .folder_path;
   let maybe_url = package_config_resolve(
-    reference.sub_path.as_deref().unwrap_or("."),
+    &reference
+      .sub_path
+      .as_ref()
+      .map(|s| format!("./{}", s))
+      .unwrap_or_else(|| ".".to_string()),
     &package_folder,
     npm_resolver,
   )

cli/tests/integration/npm_tests.rs

@@ -68,6 +68,13 @@ itest!(import_map {
   http_server: true,
 });
 
+itest!(sub_paths {
+  args: "run --unstable -A --quiet npm/sub_paths/main.jsx",
+  output: "npm/sub_paths/main.out",
+  envs: env_vars(),
+  http_server: true,
+});
+
 #[test]
 fn parallel_downloading() {
   let (out, _err) = util::run_and_collect_output_with_args(

cli/tests/testdata/npm/sub_paths/main.jsx

@@ -0,0 +1,8 @@
+import React from "npm:react@18.2.0";
+import { renderToString } from "npm:react-dom@18.2.0/server";
+
+function App({ name }) {
+  return <div>Hello {name}!</div>;
+}
+
+console.log(renderToString(<App name="World" />));

cli/tests/testdata/npm/sub_paths/main.out

@@ -0,0 +1 @@
+<div>Hello <!-- -->World<!-- -->!</div>