chore: align FormData to spec (#10169)

This PR aligns `FormData` to spec. All WPT tests are passing.

3 files changed, 13 insertions, 5 deletions

diff --git a/op_crates/file/01_file.js b/op_crates/file/01_file.js
index 17762c14a..47b44a08e 100644
--- a/op_crates/file/01_file.js
+++ b/op_crates/file/01_file.js
@@ -139,6 +139,10 @@
   const _byteSequence = Symbol("[[ByteSequence]]");
 
   class Blob {
+    get [Symbol.toStringTag]() {
+      return "Blob";
+    }
+
     /** @type {string} */
     #type;
 
@@ -286,10 +290,6 @@
       }
       return bytes.buffer;
     }
-
-    get [Symbol.toStringTag]() {
-      return "Blob";
-    }
   }
 
   webidl.converters["Blob"] = webidl.createInterfaceConverter("Blob", Blob);
@@ -336,6 +336,10 @@
   const _LastModfied = Symbol("[[LastModified]]");
 
   class File extends Blob {
+    get [Symbol.toStringTag]() {
+      return "File";
+    }
+
     /** @type {string} */
     [_Name];
     /** @type {number} */
diff --git a/op_crates/file/02_filereader.js b/op_crates/file/02_filereader.js
index b32cbfce9..640c6dd9e 100644
--- a/op_crates/file/02_filereader.js
+++ b/op_crates/file/02_filereader.js
@@ -24,6 +24,10 @@
   const aborted = Symbol("[[aborted]]");
 
   class FileReader extends EventTarget {
+    get [Symbol.toStringTag]() {
+      return "FileReader";
+    }
+
     /** @type {"empty" | "loading" | "done"} */
     [state] = "empty";
     /** @type {null | string | ArrayBuffer} */
diff --git a/op_crates/file/internal.d.ts b/op_crates/file/internal.d.ts
index 91a61d811..dd892e736 100644
--- a/op_crates/file/internal.d.ts
+++ b/op_crates/file/internal.d.ts
@@ -9,7 +9,7 @@ declare namespace globalThis {
       Blob: typeof Blob & {
         [globalThis.__bootstrap.file._byteSequence]: Uint8Array;
       };
-      _byteSequence: unique symbol;
+      readonly _byteSequence: unique symbol;
       File: typeof File & {
         [globalThis.__bootstrap.file._byteSequence]: Uint8Array;
       };