Optional input type filed with default is non-nullable in resolver

[ziimakc]

Describe the bug

For schema:

type Query {
    test(
        a: Int # can be null
        b: Int = 1  # can be null if user pass null explicitly
        c: Int! # can't be null
        d: Int! = 1 # can't be null
    ): Int!
}

This will pass validation and b will not be set to 1, which will result in unexpected null in resolver while generated types will state that it's a number

query test {
    test(a: null, b: null, c: 1, d: 1)
}

Note: avoidOptionals.defaultValue is set to true to generate correct QueryTestArgs related issue #8129

Generated arg types are correct:

export type QueryTestArgs = {
  a?: InputMaybe<Scalars['Int']>;
  b?: InputMaybe<Scalars['Int']>;
  c: Scalars['Int'];
  d: Scalars['Int'];
};

But generated resolver makes b not-nullable RequireFields<QueryTestArgs, 'b' | 'c' | 'd'>>:

export type QueryResolvers<ContextType = any, ParentType extends ResolversParentTypes['Query'] = ResolversParentTypes['Query']> = {
  test?: Resolver<ResolversTypes['Int'], ParentType, ContextType, RequireFields<QueryTestArgs, 'b' | 'c' | 'd'>>;
};

Your Example Website or App

https://codesandbox.io/s/magical-chandrasekhar-3u6881

Expected behavior

Generated resolver should be without b - RequireFields<QueryTestArgs, 'c' | 'd'>>:

export type QueryResolvers<ContextType = any, ParentType extends ResolversParentTypes['Query'] = ResolversParentTypes['Query']> = {
  test?: Resolver<ResolversTypes['Int'], ParentType, ContextType, RequireFields<QueryTestArgs, 'c' | 'd'>>;
};

Platform

"graphql": 16.5.0 "@graphql-codegen/cli": "2.9.1" "@graphql-codegen/typescript": "2.7.2" "@graphql-codegen/typescript-operations": "2.5.2" "@graphql-codegen/typescript-resolvers": "2.7.2"

Codegen Config File

schema: schema.graphql
documents: document.graphql
generates:
  types.ts:
    plugins:
      - typescript
      - typescript-operations
      - typescript-resolvers
    config:
      avoidOptionals:
        defaultValue: true