lib: fix assert shows diff messages in ESM and CJS

This PR addresses an issue which was caused by the design in
the ESM loader.
The ESM loader was modifying the file path and replacing the 'file'
property with the file proto in the stack trace.
This, in turn, led to unhandled exceptions when the assert module
attempted to open the file to display erroneous code.
The changes in this PR resolve this issue by handling the file path
correctly, ensuring that the remaining message formatting code can
execute as expected.

lib/assert.js

@@ -73,6 +73,7 @@ const CallTracker = require('internal/assert/calltracker');
 const {
   validateFunction,
 } = require('internal/validators');
+const { URL, fileURLToPath } = require('internal/url');
 
 let isDeepEqual;
 let isDeepStrictEqual;
@@ -296,7 +297,7 @@ function getErrMessage(message, fn) {
   overrideStackTrace.set(err, (_, stack) => stack);
   const call = err.stack[0];
 
-  const filename = call.getFileName();
+  let filename = call.getFileName();
   const line = call.getLineNumber() - 1;
   let column = call.getColumnNumber() - 1;
   let identifier;
@@ -330,6 +331,15 @@ function getErrMessage(message, fn) {
         const { StringDecoder } = require('string_decoder');
         decoder = new StringDecoder('utf8');
       }
+
+      // ESM file prop is a file proto. Convert that to path.
+      // This ensure opensync will not throw ENOENT for ESM files.
+      const fileProtoPrefix = 'file://';
+      if (StringPrototypeStartsWith(filename, fileProtoPrefix)) {
+        const fileUrl = new URL(filename);
+        filename = fileURLToPath(fileUrl);
+      }
+
       fd = openSync(filename, 'r', 0o666);
       // Reset column and message.
       ({ 0: column, 1: message } = getCode(fd, line, column));

test/parallel/test-assert-esm-cjs-message-verify.js

@@ -0,0 +1,55 @@
+'use strict';
+
+require('../common');
+const tmpdir = require('../common/tmpdir');
+const assert = require('assert');
+const { writeFileSync, unlink } = require('fs');
+const { execSync } = require('child_process');
+
+tmpdir.refresh();
+
+// To ensure the assert ok throwing similar error messages for esm and cjs
+
+const nodejs = `${process.execPath}`;
+
+// Importing package for each extensions.
+const fileImports = {
+  mjs: 'import assert from "assert";',
+  js: 'const assert = require("assert");',
+};
+
+const fileNames = [];
+
+for (const [ext, header] of Object.entries(fileImports)) {
+  const fileName = `test-file.${ext}`;
+  // Store the generated filesnames in an array
+  fileNames.push(`${tmpdir.path}/${fileName}`);
+
+  writeFileSync(tmpdir.resolve(fileName), `${header}\nassert.ok(0 === 2);`);
+}
+
+const errorsMessages = [];
+
+for (const fileName of fileNames) {
+  const command = `${nodejs} ${fileName}`;
+  assert.throws(
+    () => {
+      execSync(command, { stdio: 'pipe' });
+    },
+    (e) => {
+      // For each error message, filter the lines which will starts with AssertionError
+      errorsMessages.push(
+        e.message.split('\n').find((s) => s.startsWith('AssertionError'))
+      );
+      return true;
+    }
+  );
+}
+
+assert.deepStrictEqual(errorsMessages[0], errorsMessages[1]);
+
+for (const fileName of fileNames) {
+  unlink(fileName, () => {});
+}
+
+tmpdir.refresh();