Initial work, copied from the Shopify provider

framework/saleor/utils/mutations/checkout-line-item-remove.ts

@@ -0,0 +1,20 @@
+import { checkoutDetailsFragment } from '../queries/get-checkout-query'
+
+const checkoutLineItemRemoveMutation = /* GraphQL */ `
+  mutation($checkoutId: ID!, $lineItemIds: [ID!]!) {
+    checkoutLineItemsRemove(
+      checkoutId: $checkoutId
+      lineItemIds: $lineItemIds
+    ) {
+      checkoutUserErrors {
+        code
+        field
+        message
+      }
+      checkout {
+       ${checkoutDetailsFragment}
+      }
+    }
+  }
+`
+export default checkoutLineItemRemoveMutation