TypeScript error using passthrough() in GraphQL mock

[callummr]

Prerequisites

• I confirm my issue is not in the opened issues
• I confirm the Frequently Asked Questions didn't contain the answer to my issue

Environment check

• I'm using the latest msw version
• I'm using Node.js version 18 or higher

Node.js version

20.5.1

Reproduction repository

https://codesandbox.io/p/sandbox/msw-gql-passthrough-typeerror-jz9s6m?file=%2Fsrc%2Fmsw.ts

Reproduction steps

Open msw.ts. Observe TS errors.

Current behavior

TypeScript error when trying to return passthrough() in a GraphQL handler.

const operationHandler = graphql.operation(() => {
  return passthrough();
});

Argument of type '() => Response' is not assignable to parameter of type 'ResponseResolver<GraphQLResolverExtras<GraphQLVariables>, null, GraphQLResponseBody<Record<string, any>>>'.
  Type 'Response' is not assignable to type 'AsyncResponseResolverReturnType<GraphQLResponseBody<Record<string, any>>>'.
    Property '[bodyType]' is missing in type 'Response' but required in type 'StrictResponse<GraphQLResponseBody<Record<string, any>>>'.typescript(2345)

Can be worked around by casting the passthrough type:

const graphqlPassthrough = passthrough as () => ReturnType<
  typeof HttpResponse.json<{ data: any }>
>;

const operationHandler = graphql.operation(() => {
  return graphqlPassthrough();
});

Expected behavior

passthrough() can be returned in graphql mocks, as it can in http mocks.

[kettanaito]

Released: v2.1.6 🎉

This has been released in v2.1.6!

• 📄 Release notes
• 📦 npm package

Make sure to always update to the latest version (npm i msw@latest) to get the newest features and bug fixes.

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