module: allow loading files with % in the name

PR-URL: https://github.com/nodejs/node/pull/16128
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Bradley Meck <bradley.meck@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

lib/internal/url.js

@@ -1377,8 +1377,14 @@ function getPathFromURL(path) {
   return isWindows ? getPathFromURLWin32(path) : getPathFromURLPosix(path);
 }
 
+// We percent-encode % character when converting from file path to URL,
+// as this is the only character that won't be percent encoded by
+// default URL percent encoding when pathname is set.
+const percentRegEx = /%/g;
 function getURLFromFilePath(filepath) {
   const tmp = new URL('file://');
+  if (filepath.includes('%'))
+    filepath = filepath.replace(percentRegEx, '%25');
   tmp.pathname = filepath;
   return tmp;
 }

test/es-module/test-esm-double-encoding-native%20.js

@@ -0,0 +1,7 @@
+'use strict';
+require('../common');
+
+// Trivial test to assert we can load files with `%` in their pathname.
+// Imported by `test-esm-double-encoding.mjs`.
+
+module.exports = 42;

test/es-module/test-esm-double-encoding.mjs

@@ -0,0 +1,6 @@
+// Flags: --experimental-modules
+import '../common';
+
+// Assert we can import files with `%` in their pathname.
+
+import './test-esm-double-encoding-native%2520.js';