This document discusses making safer changes to a GraphQL API using lightweight testing tools. It notes that removing types, fields, directives or changing types like from string to postcode can cause breaking changes. It also advises adding non-null arguments carefully. The document recommends the graphql-contract-test npm package for demoing these concepts.

1. “Make safer changes to a GraphQL API
using some lightweight testing tools”

4. Breaking Changes
• Removing things (Types, Fields, Directives)
• Changing types (String -> PostCode)
• Adding non-null arguments
stores(orderBy: Ordering!)

5. Demo

6. npmjs.com/package/graphql-contract-test