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# Releases
## @theguild/federation-composition@0.20.0

### Minor Changes

-
[#180](#180)
[`a208f1c`](a208f1c)
Thanks [@n1ru4l](https://github.com/n1ru4l)! - Add
`composeSchemaContract` function for composing schema contracts.

    Running the following script:

    ```ts
import { composeSchemaContract } from
"@theguild/federation-composition";
    import { parse } from "graphql";

    const result = composeSchemaContract(
      [
        {
          name: "a",
          typeDefs: parse(/* GraphQL */ `
            type Query {
              a: String @tag(name: "public")
            }
          `),
          url: "a.localhost",
        },
        {
          name: "b",
          typeDefs: parse(/* GraphQL */ `
            type Query {
              b: String
            }
          `),
          url: "b.localhost",
        },
      ],
      /** Tags to include and exclude */
      {
        include: new Set(["public"]),
        exclude: new Set(),
      },
      /** Exclude unreachable types */
      true,
    );

    console.log(result.publicSdl);
    ```

Will result in the output containing only the fields tagged with
`public`:

    ```graphql
    type Query {
      a: String!
    }
    ```

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

This fixes a small issue with external fields not checking if
`@external` is on the type/interface.
Previously @ graphql-hive/console#6907
But the code was migrated here in
#180