feat(AxiosHeaders): add getSetCookie method to retrieve set-cookie headers values (#5707)

* feat(AxiosHeaders): add getSetCookie method to retrieve set-cookie header values

* refactor(AxiosHeaders.js): use logical OR instead of nullish coalescing operator in getSetCookie method

---------

Co-authored-by: Willian Agostini <willian.agostini@gmail.com.br>
Co-authored-by: Jay <jasonsaayman@gmail.com>

index.d.ts

@@ -74,6 +74,8 @@ export class AxiosHeaders {
   getAuthorization(matcher?: AxiosHeaderMatcher): AxiosHeaderValue;
   hasAuthorization(matcher?: AxiosHeaderMatcher): boolean;
 
+  getSetCookie(): string[];
+
   [Symbol.iterator](): IterableIterator<[string, AxiosHeaderValue]>;
 }
 

lib/core/AxiosHeaders.js

@@ -245,6 +245,10 @@ class AxiosHeaders {
     return Object.entries(this.toJSON()).map(([header, value]) => header + ': ' + value).join('\n');
   }
 
+  getSetCookie() {
+    return this["set-cookie"] || [];
+  }
+
   get [Symbol.toStringTag]() {
     return 'AxiosHeaders';
   }

test/unit/core/AxiosHeaders.js

@@ -423,4 +423,19 @@ describe('AxiosHeaders', function () {
       assert.deepStrictEqual(new AxiosHeaders({x:1, y:2}).toString(), 'x: 1\ny: 2');
     });
   });
+
+  describe('getSetCookie', function () {
+    it('should return set-cookie', function () {
+      const headers = new AxiosHeaders(
+        'Set-Cookie: key=val;\n' +
+        'Set-Cookie: key2=val2;\n'
+      );
+
+      assert.deepStrictEqual(headers.getSetCookie(), ['key=val;', 'key2=val2;']);
+    });
+
+    it('should return empty set-cookie', function () {
+      assert.deepStrictEqual(new AxiosHeaders().getSetCookie(), []);
+    });
+  });
 });