fix(npm): support dynamic import of Deno TS from npm package (#19858)

Closes #19843

cli/tests/integration/npm_tests.rs

@@ -107,9 +107,14 @@ itest!(cjs_require_esm_mjs_error {
 itest!(require_esm_error {
   args: "run --allow-read --quiet node/require_esm_error/main.ts",
   output: "node/require_esm_error/main.out",
+  exit_code: 1,
+});
+
+itest!(dynamic_import_deno_ts_from_npm {
+  args: "run --allow-read --quiet npm/dynamic_import_deno_ts_from_npm/main.ts",
+  output: "npm/dynamic_import_deno_ts_from_npm/main.out",
   envs: env_vars_for_npm_tests(),
   http_server: true,
-  exit_code: 1,
 });
 
 itest!(translate_cjs_to_esm {

cli/tests/testdata/npm/dynamic_import_deno_ts_from_npm/add.ts

@@ -0,0 +1,3 @@
+export function add(a: number, b: number) {
+  return a + b;
+}

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

@@ -0,0 +1,2 @@
+3
+-1

cli/tests/testdata/npm/dynamic_import_deno_ts_from_npm/main.ts

@@ -0,0 +1,8 @@
+import { dynamicImport } from "npm:@denotest/dynamic-import";
+
+const { add } = await dynamicImport(new URL("./add.ts", import.meta.url));
+console.log(add(1, 2));
+const { subtract } = await dynamicImport(
+  new URL("./subtract.mts", import.meta.url),
+);
+console.log(subtract(1, 2));

cli/tests/testdata/npm/dynamic_import_deno_ts_from_npm/subtract.mts

@@ -0,0 +1,3 @@
+export function subtract(a: number, b: number) {
+  return a - b;
+}

cli/tests/testdata/npm/registry/@denotest/dynamic-import/1.0.0/index.js

@@ -0,0 +1,3 @@
+export function dynamicImport(url) {
+  return import(url);
+}

cli/tests/testdata/npm/registry/@denotest/dynamic-import/1.0.0/package.json

@@ -0,0 +1,5 @@
+{
+  "name": "@denotest/dynamic-import",
+  "type": "module",
+  "version": "1.0.0"
+}

ext/node/resolution.rs

@@ -435,10 +435,14 @@ impl NodeResolver {
       }
     } else if url_str.ends_with(".mjs") || url_str.ends_with(".d.mts") {
       Ok(NodeResolution::Esm(url))
-    } else if url_str.ends_with(".ts") {
-      Err(generic_error(format!(
-        "TypeScript files are not supported in npm packages: {url}"
-      )))
+    } else if url_str.ends_with(".ts") || url_str.ends_with(".mts") {
+      if self.in_npm_package(&url) {
+        Err(generic_error(format!(
+          "TypeScript files are not supported in npm packages: {url}"
+        )))
+      } else {
+        Ok(NodeResolution::Esm(url))
+      }
     } else {
       Ok(NodeResolution::CommonJs(url))
     }