chore(gatsby): convert schema-customization to typescript

[Kornil]

Convert schema-customization reducer to TypeScript.

Related Issues

#21995

[vladar]

Thanks for your help! But looks like it fails a typecheck now:

packages/gatsby/src/commands/develop-process.ts:202:15 - error TS2322: Type 'IGatsbyState' is not assignable to type '{ schema: GraphQLSchema; schemaCustomization: { composer: SchemaComposer<any>; context: any; }; }'.
  The types of 'schemaCustomization.composer' are incompatible between these types.
    Type 'SchemaComposer<any> | null' is not assignable to type 'SchemaComposer<any>'.
      Type 'null' is not assignable to type 'SchemaComposer<any>'.

202         const {
                  ~
203           schema,
    ~~~~~~~~~~~~~~~~~
204           schemaCustomization,
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
205         }: {
    ~~~~~~~~~

packages/gatsby/src/query/graphql-runner.ts:197:17 - error TS2322: Type 'SchemaComposer<any> | null' is not assignable to type 'SchemaComposer<IGatsbyResolverContext<unknown, unknown>>'.
  Type 'null' is not assignable to type 'SchemaComposer<IGatsbyResolverContext<unknown, unknown>>'.

197                 schemaComposer: schemaCustomization.composer,
                    ~~~~~~~~~~~~~~

[Kornil]

Thank you! I fixed it by using the non-null assertion.

[blainekasten]

This looks great to me, let's merge it!

Thank you so much for contributing to our TypeScript refactor! We have more work to do and we would love to have you stay involved in our transition. Please submit more PRs! 💜

[blainekasten]

This looks great to me, let's merge it!

Thank you so much for contributing to our TypeScript refactor! We have more work to do and we would love to have you stay involved in our transition. Please submit more PRs! 💜