got something working thats only a little hacky

app/web/src/helpers/hooks/useUpdateProjectImages.ts

@@ -0,0 +1,31 @@
+import { useMutation } from '@redwoodjs/web'
+
+const UPDATE_PROJECT_IMAGES_MUTATION_HOOK = gql`
+  mutation updateProjectImages(
+    $id: String!
+    $mainImage64: String
+    $socialCard64: String
+  ) {
+    updateProjectImages(
+      id: $id
+      mainImage64: $mainImage64
+      socialCard64: $socialCard64
+    ) {
+      id
+      mainImage
+      socialCard {
+        id
+        url
+      }
+    }
+  }
+`
+
+export const useUpdateProjectImages = ({ onCompleted = () => {} }) => {
+  const [updateProjectImages, { loading, error }] = useMutation(
+    UPDATE_PROJECT_IMAGES_MUTATION_HOOK,
+    { onCompleted }
+  )
+
+  return { updateProjectImages, loading, error }
+}