fix: handle undefined namedType for introspection

[Diizzayy]

Description

This PR handles instances where the namedType is undefined and prevents it from being passed to the isIntrospectionType function which would result in a crash as outlined in #8389

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

I've ran and ensured that the existing tests pass

Test Environment:

• Operating System: Linux
• Node Version: v14.19.1
• Package Manager: yarn@1.22.19

Checklist:

• I have followed the CONTRIBUTING doc and the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[changeset-bot]

🦋 Changeset detected

Latest commit: 8f6fc13

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 9 packages

Name	Type
@graphql-codegen/typescript	Major
@graphql-codegen/typescript-mongodb	Patch
@graphql-codegen/typescript-operations	Patch
@graphql-codegen/typescript-resolvers	Patch
@graphql-codegen/typescript-type-graphql	Patch
@graphql-codegen/client-preset	Patch
@graphql-codegen/gql-tag-operations-preset	Patch
@graphql-codegen/cli	Patch
@graphql-cli/codegen	Patch

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[charlypoly]

This PR handles instances where the namedType is undefined and prevents it from being passed to the isIntrospectionType function which would result in a crash as outlined in #8389

Hi @Diizzayy,

Could you provide an example of reproduction for this bug?

[Diizzayy]

Could you provide an example of reproduction for this bug?

@charlypoly Thank you for getting back to me on this, the linked issue #8389 provides a reproduction at that demonstrates this bug https://github.com/Diizzayy/cgenbug