fix: add [Symbol.toStringTag] to Headers (#77)

Co-authored-by: Artem Zakharchenko <[email protected]>
mswjs · Mar 18, 2024 · 539042b · 539042b
1 parent 67f3136
commit 539042b
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Showing 2 changed files with 10 additions and 1 deletion.
diff --git a/src/Headers.test.ts b/src/Headers.test.ts
@@ -84,6 +84,12 @@ describe('[Symbol.iterator]', () => {
   })
 })
 
+describe('[Symbol.toStringTag]', () => {
+  it('returns "[object Headers]" when called', () => {
+    expect(new Headers().toString()).toEqual('[object Headers]')
+  })
+})
+
 describe('.keys()', () => {
   it('returns the iterator with the header keys', () => {
     const headers = new Headers({

diff --git a/src/Headers.ts b/src/Headers.ts
@@ -27,7 +27,8 @@ export class Headers {
     if (
       ['Headers', 'HeadersPolyfill'].includes(init?.constructor.name) ||
       init instanceof Headers ||
-      (typeof globalThis.Headers !== 'undefined' && init instanceof globalThis.Headers)
+      (typeof globalThis.Headers !== 'undefined' &&
+        init instanceof globalThis.Headers)
     ) {
       const initialHeaders = init as Headers
       initialHeaders.forEach((value, name) => {
@@ -51,6 +52,8 @@ export class Headers {
     }
   }
 
+  [Symbol.toStringTag] = 'Headers';
+
   [Symbol.iterator]() {
     return this.entries()
   }