language support for `@oneOf`

[acao]

Resolves #3678

Requires reverting https://github.com/graphql/graphiql/pull/3682

• [x] switch devDependecies to use graphql@16.9.0 for full @oneOf support
• [ ] diagnostics support - I can't seem to get the rule to work :( - caused by #3682
• [ ] autocompletion support - works in unit tests, but not yet in graphiql because of #3682
• [ ] hover support
• [x] fix all unit tests failures caused by adding a new input type to the test schema

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 65.40%. Comparing base (484a9ad) to head (b65cda9). Report is 9 commits behind head on main.

Additional details and impacted files

[](https://app.codecov.io/gh/graphql/graphiql/pull/3769?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=graphql) ```diff @@ Coverage Diff @@ ## main #3769 +/- ## ========================================== + Coverage 65.32% 65.40% +0.07% ========================================== Files 122 122 Lines 7003 7019 +16 Branches 2260 2247 -13 ========================================== + Hits 4575 4591 +16 Misses 2411 2411 Partials 17 17 ``` | [Files with missing lines](https://app.codecov.io/gh/graphql/graphiql/pull/3769?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=graphql) | Coverage Δ | | |---|---|---| | [packages/graphiql-react/src/schema.tsx](https://app.codecov.io/gh/graphql/graphiql/pull/3769?src=pr&el=tree&filepath=packages%2Fgraphiql-react%2Fsrc%2Fschema.tsx&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=graphql#diff-cGFja2FnZXMvZ3JhcGhpcWwtcmVhY3Qvc3JjL3NjaGVtYS50c3g=) | `82.69% <ø> (ø)` | | | [packages/graphiql/test/schema.js](https://app.codecov.io/gh/graphql/graphiql/pull/3769?src=pr&el=tree&filepath=packages%2Fgraphiql%2Ftest%2Fschema.js&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=graphql#diff-cGFja2FnZXMvZ3JhcGhpcWwvdGVzdC9zY2hlbWEuanM=) | `42.66% <100.00%> (+4.09%)` | :arrow_up: | | [...ervice/src/interface/getAutocompleteSuggestions.ts](https://app.codecov.io/gh/graphql/graphiql/pull/3769?src=pr&el=tree&filepath=packages%2Fgraphql-language-service%2Fsrc%2Finterface%2FgetAutocompleteSuggestions.ts&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=graphql#diff-cGFja2FnZXMvZ3JhcGhxbC1sYW5ndWFnZS1zZXJ2aWNlL3NyYy9pbnRlcmZhY2UvZ2V0QXV0b2NvbXBsZXRlU3VnZ2VzdGlvbnMudHM=) | `86.12% <100.00%> (+0.29%)` | :arrow_up: | | [...graphql-language-service/src/parser/getTypeInfo.ts](https://app.codecov.io/gh/graphql/graphiql/pull/3769?src=pr&el=tree&filepath=packages%2Fgraphql-language-service%2Fsrc%2Fparser%2FgetTypeInfo.ts&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=graphql#diff-cGFja2FnZXMvZ3JhcGhxbC1sYW5ndWFnZS1zZXJ2aWNlL3NyYy9wYXJzZXIvZ2V0VHlwZUluZm8udHM=) | `83.78% <100.00%> (+0.33%)` | :arrow_up: |