Qualify import as node:fs/promises.

Author: whitequark

lib/fetch.js

@@ -3,11 +3,11 @@ if (typeof process === 'object' && process.release?.name === 'node') {
     // Node doesn't have a usable `fetch()`.
     fetch = async function(url, options) {
         if (url.protocol === 'file:') {
-            const { readFile } = await import('fs/promises');
+            const { readFile } = await import('node:fs/promises');
             let contentType = 'application/octet-stream';
             if (url.pathname.endsWith('.wasm'))
                 contentType = 'application/wasm';
-            return new Response(await readFile(url), { headers: { "Content-Type": contentType } });
+            return new Response(await readFile(url), { headers: { 'Content-Type': contentType } });
         } else {
             return globalThis.fetch(url, options);
         }