fix: support null values

Author: posva

src/utils.js

@@ -29,6 +29,7 @@ export function extractRefs (doc, oldDoc, path = '', result = [{}, {}]) {
       extractRefs(ref, oldDoc[key], path + key + '.', [tot[0][key], tot[1]])
     } else if (
       ref instanceof Date ||
+      ref == null ||
       (ref.longitude && ref.latitude) // GeoPoint
     ) {
       tot[0][key] = ref

test/utils.spec.js

@@ -79,6 +79,22 @@ test('extract object nested refs from document', () => {
   })
 })
 
+test('works with null', () => {
+  const [noRefsDoc, refs] = extractRefs({
+    a: null,
+    nested: {
+      a: null
+    }
+  })
+  expect(noRefsDoc).toEqual({
+    a: null,
+    nested: {
+      a: null
+    }
+  })
+  expect(refs).toEqual({})
+})
+
 test('extract deep object nested refs from document', () => {
   const [noRefsDoc, refs] = extractRefs({
     obj: {