Merge pull request #1 from citizensadvice/allow-form-data-object

Allow form data object

Author: mrdaniellewis

CHANGELOG.md

@@ -0,0 +1,5 @@
+# CHANGELOG
+
+## v1.1.0 _8 August 2022_
+
+- Allows passing an existing `FormData` object

index.js

@@ -91,7 +91,7 @@ function normalizeParams(params, name, v, depth) {
 }
 
 export default function formToRackParams(form) {
-  const data = new FormData(form);
+  const data = form instanceof FormData ? form : new FormData(form);
   const serialized = Object.create(null);
 
   for (const [key, value] of data) {

index.test.js

@@ -138,3 +138,13 @@ describe('x[y]=1&x[y][][w]=2', () => {
     }).toThrow('expected Array (got string) for param `y`');
   });
 });
+
+describe('with a formData object', () => {
+  it('is converted to params', () => {
+    makeDOM('x=1');
+    const formData = new FormData(document.querySelector('form'));
+    expect(serializeForm(formData)).toEqual({
+      x: '1',
+    });
+  });
+});