module: reduce the number of URL initializations

lib/internal/main/check_syntax.js

@@ -4,6 +4,7 @@
 // instead of actually running the file.
 
 const { getOptionValue } = require('internal/options');
+const { URL } = require('internal/url');
 const {
   prepareMainThreadExecution,
   markBootstrapComplete,
@@ -67,7 +68,7 @@ async function checkSyntax(source, filename) {
     const { defaultResolve } = require('internal/modules/esm/resolve');
     const { defaultGetFormat } = require('internal/modules/esm/get_format');
     const { url } = await defaultResolve(pathToFileURL(filename).toString());
-    const format = await defaultGetFormat(url);
+    const format = await defaultGetFormat(new URL(url));
     isModule = format === 'module';
   }
 

lib/internal/modules/esm/get_format.js

@@ -17,7 +17,7 @@ const {
 const experimentalNetworkImports =
   getOptionValue('--experimental-network-imports');
 const { getPackageType, getPackageScopeConfig } = require('internal/modules/esm/resolve');
-const { URL, fileURLToPath } = require('internal/url');
+const { fileURLToPath } = require('internal/url');
 const { ERR_UNKNOWN_FILE_EXTENSION } = require('internal/errors').codes;
 
 const protocolHandlers = {
@@ -117,27 +117,29 @@ function getHttpProtocolModuleFormat(url, context) {
 }
 
 /**
- * @param {URL | URL['href']} url
+ * @param {URL} url
  * @param {{parentURL: string}} context
  * @returns {Promise<string> | string | undefined} only works when enabled
  */
 function defaultGetFormatWithoutErrors(url, context) {
-  const parsed = new URL(url);
-  if (!ObjectPrototypeHasOwnProperty(protocolHandlers, parsed.protocol))
+  const protocol = url.protocol;
+  if (!ObjectPrototypeHasOwnProperty(protocolHandlers, protocol)) {
     return null;
-  return protocolHandlers[parsed.protocol](parsed, context, true);
+  }
+  return protocolHandlers[protocol](url, context, true);
 }
 
 /**
- * @param {URL | URL['href']} url
+ * @param {URL} url
  * @param {{parentURL: string}} context
  * @returns {Promise<string> | string | undefined} only works when enabled
  */
 function defaultGetFormat(url, context) {
-  const parsed = new URL(url);
-  return ObjectPrototypeHasOwnProperty(protocolHandlers, parsed.protocol) ?
-    protocolHandlers[parsed.protocol](parsed, context, false) :
-    null;
+  const protocol = url.protocol;
+  if (!ObjectPrototypeHasOwnProperty(protocolHandlers, protocol)) {
+    return null;
+  }
+  return protocolHandlers[protocol](url, context, false);
 }
 
 module.exports = {

lib/internal/modules/esm/load.js

@@ -79,11 +79,11 @@ async function defaultLoad(url, context = kEmptyObject) {
     source,
   } = context;
 
-  throwIfUnsupportedURLScheme(new URL(url), experimentalNetworkImports);
+  const urlInstance = new URL(url);
 
-  if (format == null) {
-    format = await defaultGetFormat(url, context);
-  }
+  throwIfUnsupportedURLScheme(urlInstance, experimentalNetworkImports);
+
+  format ??= await defaultGetFormat(urlInstance, context);
 
   validateAssertions(url, format, importAssertions);