graphql-schema-diff 0.1.1

# graphql-schema-diff

[![crates.io](https://img.shields.io/crates/v/graphql-schema-diff)](https://crates.io/crates/graphql-schema-diff)]
[![docs.rs](https://img.shields.io/docsrs/graphql-schema-diff)](https://docs.rs/graphql-schema-diff/)

This crate implements diffing of two GraphQL schemas, returning a list of changes. It powers the changelog feature and operation checks at Grafbase.

## Example

```rust
use graphql_schema_diff::{diff, Change, ChangeKind};

fn main() {
  let source = r#"
    type Pizza {
      id: ID!
      name: String!
      toppings: [Topping!]!
    }

    enum Topping {
      OLIVES
      MUSHROOMS
      PINEAPPLE
    }
  "#;

  let target = r#"
    type Pizza {
      id: ID!
      name: PizzaName
      toppings: [Topping!]!
    }

    type PizzaName {
      english: String
      italian: String!
    }

    enum Topping {
      OLIVES
      MUSHROOMS
      POTATO
    }
  "#;

  let changes = diff(source, target).unwrap();

  assert_eq!(changes,
     &[
          Change {
              path: String::from("Pizza.name"),
              kind: ChangeKind::ChangeFieldType
          },
          Change {
              path: String::from("PizzaName"),
              kind: ChangeKind::AddObjectType
          },
          Change {
              path: String::from("PizzaName.english"),
              kind: ChangeKind::AddField
          },
          Change {
              path: String::from("PizzaName.italian"),
              kind: ChangeKind::AddField
          },
          Change {
              path: String::from("Topping.PINEAPPLE"),
              kind: ChangeKind::RemoveEnumValue
          },
          Change {
              path: String::from("Topping.POTATO"),
              kind: ChangeKind::AddEnumValue
          }
  ]);
}

```

## Cargo features

- `serde`: `Serialize` and `Deserialize` impls for `Change` (default: on).