feat: support new URL(url, import.meta.url) pattern by default

closes #491

Author: sxzz

src/features/rolldown.ts

@@ -183,6 +183,9 @@ export async function resolveInputOptions(
             defaultHandler(level, log)
           }
         : undefined,
+      experimental: {
+        resolveNewUrlToAsset: true,
+      },
     },
     config.inputOptions,
     [format, { cjsDts }],

tests/__snapshots__/new-URL-url-import-meta-url-pattern.snap.md

@@ -0,0 +1,18 @@
+## assets/mod-BCOeK2IZ.ts
+
+```ts
+export const foo = 42
+```
+## assets/text-gNTN1G_6.txt
+
+```txt
+Just some text
+```
+## index.js
+
+```js
+const modUrl = new URL("assets/mod-BCOeK2IZ.ts", import.meta.url);
+const textUrl = new URL("assets/text-gNTN1G_6.txt", import.meta.url);
+export { modUrl, textUrl };
+
+```

tests/index.test.ts

@@ -537,3 +537,22 @@ test('dts not enabled when exports["."] is string instead of object', async (con
   expect(outputFiles).not.toContain('index.d.mts')
   expect(outputFiles).toContain('index.mjs')
 })
+
+test('new URL(url, import.meta.url) pattern', async (context) => {
+  const files = {
+    'index.ts': `
+    export const modUrl = new URL('./mod.ts', import.meta.url);
+    export const textUrl = new URL('./text.txt', import.meta.url);
+    `,
+    'mod.ts': 'export const foo = 42',
+    'text.txt': 'Just some text',
+  }
+
+  await testBuild({
+    context,
+    files,
+    options: {
+      minify: 'dce-only',
+    },
+  })
+})