module: improve support of data: URLs

Add support for loading modules using percent-encoded URLs.

PR-URL: #37392
Backport-PR-URL: #39669
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Bradley Farias <bradley.meck@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Jan Krems <jan.krems@gmail.com>
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>

lib/internal/modules/esm/get_source.js

@@ -2,6 +2,7 @@
 
 const {
   RegExpPrototypeExec,
+  decodeURIComponent,
 } = primordials;
 const { getOptionValue } = require('internal/options');
 // Do not eagerly grab .manifest, it may be in TDZ
@@ -31,8 +32,8 @@ async function defaultGetSource(url, { format } = {}, defaultGetSource) {
     if (!match) {
       throw new ERR_INVALID_URL(url);
     }
-    const [ , base64, body ] = match;
-    source = Buffer.from(body, base64 ? 'base64' : 'utf8');
+    const { 1: base64, 2: body } = match;
+    source = Buffer.from(decodeURIComponent(body), base64 ? 'base64' : 'utf8');
   } else {
     throw new ERR_INVALID_URL_SCHEME(['file', 'data']);
   }

test/es-module/test-esm-data-urls.js

@@ -102,4 +102,9 @@ function createBase64URL(mime, body) {
       assert.strictEqual(e.code, 'ERR_INVALID_MODULE_SPECIFIER');
     }
   }
+  {
+    const plainESMURL = 'data:text/javascript,export%20default%202';
+    const module = await import(plainESMURL);
+    assert.strictEqual(module.default, 2);
+  }
 })().then(common.mustCall());