module: add support for URL to import.meta.resolve

doc/api/esm.md

@@ -280,6 +280,15 @@ const buffer = readFileSync(new URL('./data.proto', import.meta.url));
 ```
 
 ### `import.meta.resolve(specifier[, parent])`
+<!--
+added:
+  - v13.9.0
+  - v12.16.2
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/38587
+    description: Add support for WHATWG `URL` object to `parentURL` parameter.
+-->
 
 > Stability: 1 - Experimental
 

lib/internal/modules/esm/loader.js

@@ -13,15 +13,15 @@ const {
 } = primordials;
 
 const {
+  ERR_INVALID_ARG_TYPE,
   ERR_INVALID_ARG_VALUE,
   ERR_INVALID_MODULE_SPECIFIER,
   ERR_INVALID_RETURN_PROPERTY,
   ERR_INVALID_RETURN_PROPERTY_VALUE,
   ERR_INVALID_RETURN_VALUE,
   ERR_UNKNOWN_MODULE_FORMAT
 } = require('internal/errors').codes;
-const { URL, pathToFileURL } = require('internal/url');
-const { validateString } = require('internal/validators');
+const { URL, pathToFileURL, isURLInstance } = require('internal/url');
 const ModuleMap = require('internal/modules/esm/module_map');
 const ModuleJob = require('internal/modules/esm/module_job');
 
@@ -83,8 +83,8 @@ class Loader {
 
   async resolve(specifier, parentURL) {
     const isMain = parentURL === undefined;
-    if (!isMain)
-      validateString(parentURL, 'parentURL');
+    if (!isMain && typeof parentURL !== 'string' && !isURLInstance(parentURL))
+      throw new ERR_INVALID_ARG_TYPE('parentURL', ['string', 'URL'], parentURL);
 
     const resolveResponse = await this._resolve(
       specifier, { parentURL, conditions: DEFAULT_CONDITIONS }, defaultResolve);

test/es-module/test-esm-import-meta-resolve.mjs

@@ -19,6 +19,19 @@ const fixtures = dirname.slice(0, dirname.lastIndexOf('/', dirname.length - 2) +
     await import.meta.resolve('../fixtures/empty-with-bom.txt'),
     fixtures + 'empty-with-bom.txt');
   assert.strictEqual(await import.meta.resolve('../fixtures/'), fixtures);
+  assert.strictEqual(
+    await import.meta.resolve('../fixtures/', import.meta.url),
+    fixtures);
+  assert.strictEqual(
+    await import.meta.resolve('../fixtures/', new URL(import.meta.url)),
+    fixtures);
+  await Promise.all(
+    [[], {}, Symbol(), 0, 1, 1n, 1.1, () => {}, true, false].map((arg) =>
+      assert.rejects(import.meta.resolve('../fixtures/', arg), {
+        code: 'ERR_INVALID_ARG_TYPE',
+      })
+    )
+  );
   assert.strictEqual(await import.meta.resolve('baz/', fixtures),
                      fixtures + 'node_modules/baz/');
 })().then(mustCall());