Support batch GraphQL operations

[msutkowski]

Closes #510

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[msutkowski]

This actually needs more work. I finally set up an environment to actually test the batch link behavior and ran into issues. Will update later on :)

[dkhuntrods]

@msutkowski 👋

I've done some work on this (branched from an earlier version as we need to support older TS versions) as we needed the functionality ASAP.

Hopefully it's of help - we'd much rather to be able to use and support original package!

/cc @kettanaito

[kettanaito]

Thank you for providing that implementation reference, @dkhuntrods!

With the recent changes to the request handlers, this pull request needs a little adjustment. I've tried to structure the steps that a request handler performs, so the new logic we add will fall under one of the steps (most likely a parsing phase). I'd be happy to give a hand in aligning these changes with the latest state of the repository.

A huge thank you, @msutkowski, for preparing this. Let me know if you need help with rebasing this branch.

[kettanaito]

Hey, @msutkowski. During our discussion, I've mentioned a utility that can differentiate between REST and GraphQL requests. Here it is:

https://github.com/mswjs/msw/blob/655c93f83b7fcebe9a9093cacd7d891939028d29/src/utils/internal/parseGraphQLRequest.ts#L139-L172

We are already using it in the GraphQL request handler during the parsing phase:

https://github.com/mswjs/msw/blob/655c93f83b7fcebe9a9093cacd7d891939028d29/src/handlers/GraphQLHandler.ts#L107-L109

That parsing result is later taken into account in the predicate step that decides whether a request should be treated as a GraphQL request and be handled by the respective handler:

https://github.com/mswjs/msw/blob/655c93f83b7fcebe9a9093cacd7d891939028d29/src/handlers/GraphQLHandler.ts#L121-L124

It seems that no extra logic should be necessary as a part of the batched GraphQL queries support. As always, I may be wriong. Would appreciate your expertise on this. Thank you.

[kettanaito]

@msutkowski, hey 👋 Quite a bunch of things has changed around request handlers since this improvement was opened. I think you are right to consider opening a new pull request, it'll be less hassle than trying to migrate the current state.

Thank you so much for working on this one!

[otaciliolacerda]

Hi all, by the state of this branch can I assume msw currently does not support batch requests?

[kettanaito]

Released: v2.1.3 🎉

This has been released in v2.1.3!

• 📄 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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