diff --git a/src/test262.js b/src/test262.js
index d2edf16c0ec..58da90feaf2 100644
--- a/src/test262.js
+++ b/src/test262.js
@@ -42,6 +42,7 @@ await run({
     const isModule = preamble.flags?.includes("module");
 
     let ast;
+    const comments = [];
     try {
       ast = AcornParser.parse(code, {
         ecmaVersion: "latest",
@@ -51,6 +52,7 @@ await run({
         allowReturnOutsideFunction: true,
         // Note: Do not specify `allowAwaitOutsideFunction` option.
         // It defaults to `true` for modules, `false` for scripts, which is what we want.
+        onComment: comments,
       });
     } catch {
       try {
@@ -63,6 +65,7 @@ await run({
           globalReturn: true,
           webcompat: true, // I think this enables support for Annex B
           next: true, // Enable parsing decorators and import attributes
+          onComment: comments,
         });
       } catch {
         return;
@@ -71,6 +74,14 @@ await run({
       fixMeriyahValue(ast);
     }
 
+    // Add `hashbang` property to AST if file starts with a hashbang.
+    // This property is non-standard and exclusive to Oxc.
+    if (comments.length > 0 && code.startsWith("#!") && comments[0].type === "Line") {
+      ast.hashbang = { ...comments[0], type: "Hashbang" };
+    } else {
+      ast.hashbang = null;
+    }
+
     // Parse tokens
     const tokensJson = parseEspreeTokens(code, isModule, false);
 
diff --git a/src/typescript-eslint.js b/src/typescript-eslint.js
index d010eaf8795..b0562a3d15f 100644
--- a/src/typescript-eslint.js
+++ b/src/typescript-eslint.js
@@ -29,7 +29,6 @@ await run({
             jsx: test.sourceType.jsx,
           },
         });
-        // oxlint-disable-next-line no-unused-vars
         const { comments, tokens, ...program } = result.ast;
 
         // TS-ESLint parser has no `unambiguous` option, so emulate it here
@@ -73,6 +72,20 @@ await run({
           }
         }
 
+        // Add `hashbang` property to AST if file starts with a hashbang.
+        // This property is non-standard and exclusive to Oxc.
+        if (comments.length > 0 && comments[0].type === "Shebang") {
+          const comment = comments[0];
+          program.hashbang = {
+            type: "Hashbang",
+            value: comment.value,
+            start: comment.range[0],
+            end: comment.range[1],
+          };
+        } else {
+          program.hashbang = null;
+        }
+
         const astJson = stringifyWith(program, transformerTs);
         output += "__ESTREE_TEST__:AST:\n```json\n" + astJson + "\n```\n";
 
diff --git a/src/utils/json.js b/src/utils/json.js
index 74e861a9fe2..e30a72b957f 100644
--- a/src/utils/json.js
+++ b/src/utils/json.js
@@ -135,8 +135,6 @@ export function transformerTs(_key, value) {
 }
 
 export function stringifyWith(ast, transformer) {
-  // Add `hashbang` field
-  ast.hashbang = null;
   // Serialize to JSON, with modifications
   let json = JSON.stringify(ast, transformer, 2);
   json = json.replace(INFINITY_REGEXP, "1e+400");
diff --git a/tests/test262/test/language/comments/hashbang/line-terminator-carriage-return.json b/tests/test262/test/language/comments/hashbang/line-terminator-carriage-return.json
index 2980965bdf9..aba409b6282 100644
--- a/tests/test262/test/language/comments/hashbang/line-terminator-carriage-return.json
+++ b/tests/test262/test/language/comments/hashbang/line-terminator-carriage-return.json
@@ -9,7 +9,12 @@
     }
   ],
   "sourceType": "script",
-  "hashbang": null,
+  "hashbang": {
+    "type": "Hashbang",
+    "value": " this comment ends with a Carriage Return (U+000D)",
+    "start": 0,
+    "end": 52
+  },
   "start": 0,
   "end": 637
 }
\ No newline at end of file
diff --git a/tests/test262/test/language/comments/hashbang/line-terminator-line-separator.json b/tests/test262/test/language/comments/hashbang/line-terminator-line-separator.json
index a24cb890533..37d4628bb54 100644
--- a/tests/test262/test/language/comments/hashbang/line-terminator-line-separator.json
+++ b/tests/test262/test/language/comments/hashbang/line-terminator-line-separator.json
@@ -9,7 +9,12 @@
     }
   ],
   "sourceType": "script",
-  "hashbang": null,
+  "hashbang": {
+    "type": "Hashbang",
+    "value": " this comment ends with a Line Separator (U+2028)",
+    "start": 0,
+    "end": 51
+  },
   "start": 0,
   "end": 635
 }
\ No newline at end of file
diff --git a/tests/test262/test/language/comments/hashbang/line-terminator-paragraph-separator.json b/tests/test262/test/language/comments/hashbang/line-terminator-paragraph-separator.json
index 18fcf713518..679c2bebe17 100644
--- a/tests/test262/test/language/comments/hashbang/line-terminator-paragraph-separator.json
+++ b/tests/test262/test/language/comments/hashbang/line-terminator-paragraph-separator.json
@@ -9,7 +9,12 @@
     }
   ],
   "sourceType": "script",
-  "hashbang": null,
+  "hashbang": {
+    "type": "Hashbang",
+    "value": " this comment ends with a Paragraph Separator (U+2029)",
+    "start": 0,
+    "end": 56
+  },
   "start": 0,
   "end": 645
 }
\ No newline at end of file
diff --git a/tests/test262/test/language/comments/hashbang/module.json b/tests/test262/test/language/comments/hashbang/module.json
index accd9edcef2..1da8a68315f 100644
--- a/tests/test262/test/language/comments/hashbang/module.json
+++ b/tests/test262/test/language/comments/hashbang/module.json
@@ -2,7 +2,12 @@
   "type": "Program",
   "body": [],
   "sourceType": "module",
-  "hashbang": null,
+  "hashbang": {
+    "type": "Hashbang",
+    "value": "",
+    "start": 0,
+    "end": 2
+  },
   "start": 0,
   "end": 333
 }
\ No newline at end of file
diff --git a/tests/test262/test/language/comments/hashbang/not-empty.json b/tests/test262/test/language/comments/hashbang/not-empty.json
index 2b6845116c0..84cba97d3d8 100644
--- a/tests/test262/test/language/comments/hashbang/not-empty.json
+++ b/tests/test262/test/language/comments/hashbang/not-empty.json
@@ -2,7 +2,12 @@
   "type": "Program",
   "body": [],
   "sourceType": "script",
-  "hashbang": null,
+  "hashbang": {
+    "type": "Hashbang",
+    "value": " these characters should be treated as a comment",
+    "start": 0,
+    "end": 50
+  },
   "start": 0,
   "end": 412
 }
\ No newline at end of file
diff --git a/tests/test262/test/language/comments/hashbang/use-strict.json b/tests/test262/test/language/comments/hashbang/use-strict.json
index 9798b9d796f..7959e817138 100644
--- a/tests/test262/test/language/comments/hashbang/use-strict.json
+++ b/tests/test262/test/language/comments/hashbang/use-strict.json
@@ -20,7 +20,12 @@
     }
   ],
   "sourceType": "script",
-  "hashbang": null,
+  "hashbang": {
+    "type": "Hashbang",
+    "value": "\"use strict\"",
+    "start": 0,
+    "end": 14
+  },
   "start": 0,
   "end": 391
 }
\ No newline at end of file