chore(deps): update relay monorepo to v18 (major)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
babel-plugin-relay (source)	^10.1.3 -> ^18.2.0
react-relay (source)	^12.0.0 -> ^18.2.0
relay-compiler (source)	^12.0.0 -> ^18.2.0
relay-runtime (source)	^12.0.0 -> ^18.2.0

---

Release Notes

facebook/relay (babel-plugin-relay)

v18.2.0

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v18.1.0: Version 18.1.0 Release Notes

Compare Source

Following up from our v18.0.0 release last month, v18.1.0 provides a number of fixes and improvements, adds some new experimental APIs, and ships some long-running experimental features as stable.

Relay Resolvers are now stable

For the past several years we've been iterating on Relay Resolvers which provided a structured and typesafe way to model client state and derived data in your GraphQL graph. As of this release, Relay Resolvers are enabled by default and no-longer experimental. As part of this stabilization we shipped fixes for Relay Resolvers when used with TypeScript and fixed a few edge cases related to how errors encountered by resolvers are handled.

• [d10786]: Update docs now that resolvers are stable by Jordan Eldredge
• [4e5377]: Remove Relay Resolver compiler feature flag by Jordan Eldredge
• [7b8f1f]: Remove ENABLE_RELAY_RESOLVERS runtime feature flag by Jordan Eldredge
• [1467b6]: Stabilize LiveResolverStore as the new implementation of RelayModernStore (#​4806) by Jordan Eldredge
• [dec5ee]: Avoid running resolver code if root fragment throws with @​required(action: THROW) (#​4799) by Jordan Eldredge
• [478274]: Ensure we import the type of a resolver for RelayResolverValue fields by Jordan Eldredge
• [852fbc]: Improve edge resolver error messages by Gordy French
• [575f20]: Add satisfies type assertion for typescript (#​4797) by Drew Atkinson
• [2314f4]: Document relay field logger (#​4809) by Jordan Eldredge

Improvements to error @​catch

We released @catch in v18.0.0 and are very excited about the capabilities it enables. Check out Itamar Kestenbaum's GraphQL conf talk about it here: Build Confidently: How @​Catch and Error Handling Pave Way in Field Nullability.

Since that release we've made a few improvements:

• Fields within a @catch directive that are marked as @semanticNonNull in the schema now generate non-nullable TypeScript/Flow types. See semantic nullability.
• Errors exposed to product code by @catch no-longer include the error message. This is because GraphQL error messages are generally not safe to show to users. These error messages can still be accessed by the field logger provided to your Relay Environment. In the future we plan to let users opt into allowing safe error messages through to product code.

• [26b78d]: Take advantage of @​semanticNonNull within @​catch (#​4794) by Jordan Eldredge
• [6a038d]: Replace actual server-side error with generic "server error" message by Itamar Kestenbaum
• [6c8827]: Don't report missing fields within an unmatched inline fragment by Jordan Eldredge
• [2314f4]: Document relay field logger (#​4809) by Jordan Eldredge

Compiler Error Reporting

We've improved how errors are reported by the Relay compiler to ensure we report as many errors as possible, and each error includes sufficient context.

• [9edbb0]: Report validation errors for all segements of a proejct by Jordan Eldredge
• [adaf8a]: Report location of operation that does not define variable by Jordan Eldredge

New "Copy Operation" VSCode command

Our VSCode extension now includes a command to quickly copy the full text of a query directly from within your editor.

• [8d2380]: Add copy operation command (#​4778) by Tobias Tengler

Experimental APIs for reading fragment data outside of React

In some cases it can be useful to read a fragment outside of a React hook. However, doing this requires handling a number of concerns.

1. The fragment data may not yet be ready (@defer or Relay Resolver suspense).
2. The fragment may error (@throwOnFieldError, @required(action: THROW))
3. The fragment's data might change over time.

To enable users to read fragment data while correctly handling these cases, we've added two experimental APIs:

• observeFragment: Read a fragment as a stream of states where each state might be loading, error, or value.
• waitForFragmentData: Read a fragment as a promise which will resolve when data is available, or reject if an error is encountered.

• [6f0cbe]: Upstream observeFragment and waitForFragmentData to relay-runtime by Jordan Eldredge
• [36eecf]: Documentation for observeFragment and waitForFragmentData by Jordan Eldredge

Docs

Thanks to members of our community for submitting pull requests to improve our docs:

• [e133fe]: Remove reference to the Google Chrome Extension Store from the installation guide for Relay Developer Tools by Jakub KopÃ…â„¢iva
• [e41490]: Replace story.image for story.thumbnail (#​4793) by Theo Kouzelis
• [e95a5a]: Update mutations-updates.md in Tutorials (#​4765) by Jbee
• [0cf094]: Update error handling and semantic nullability docs to include talks and links (#​4800) by Jordan Eldredge

Improvements

• [08c74e]: Validate semantic-non-null interface implementations by Gordy French
• [a5b963]: Renaming missing_field log event types to missing_required_field by Itamar Kestenbaum
• [186c91]: Call cleanup of insertion effects when hidden (#​30954) by rickhanlonii (Meta Employee)
• [ba0b46]: Add logging for normalization by Tianyu Yao
• [792628]: Relay: Allow omitting exists on ExternalFileSourceResult by Nico Reed
• [f1ee92]: Check pruned fields blocklist for undefined fields by Steven Chaitoff
• [23958c]: Make metadata_for_machine keys string constants by Steven Chaitoff
• [8d0302]: Relay: Remove unused code from oss code by Nico Reed
• [6d36d7]: Fix mockClientData with generateDeferredPayload = true by Fernando Gorodscy

Experimental

We are always continuing to evolve and improve Relay. These changes are part of features or implementations which are either in progress or are being experimented with internally.

• [cb1b4d]: Add feature flag and config option to give custom path for artifacts by Monica Tang
• [4acf3f]: Make usePaginationFragment compatible with by Joe Savona
• [f9365f]: Attempt to avoid cycled when expanding updated ids to include impacted resolvers (#​4792) by Jordan Eldredge
• [59b2a6]: UseQueryLoader() (and refetch()) compatibility with by Joe Savona
• [2f997b]: Update generated data driven dependency metadata for client 3D by Lynn Yu
• [790d46]: Update Relay API for disk caching by Evan Yeung
• [bb30bb]: Add feature flag for reader AST module imports by Evan Yeung
• [f0761b]: Add a priority flag to task scheduler for store network updates by Tianyu Yao
• [6f8f79]: Move corpus creation of program into helper function by Gordy French

v18.0.0: Version 18.0.0 Release Notes

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With version 18, the Relay team at Meta and our community of contributors have made several significant improvements to Relay:

• Improved validation of argument types
• @alias released as stable
• @catch to detect and granularly handle field errors
• @throwOnFieldError and @semanticNonNull to avoid having to handle the nullability of fields which are only null in the case of error.
• Intellisense for your Relay config file
• Rename refactoring tools and inlay hints for fragment arguments

Read all about them in more detail below:

Breaking Changes

Improved validation of field and fragment arguments

Previously we were not correctly type-checking arguments passed to client-defined fields, such as Relay Resolvers and Client Schema Extensions. This new release adds that validation. If you need to opt out of this validation for any reason, you can enable the disable_full_argument_type_validation compiler feature flag.

{
    // ... rest of config
    "featureFlags": {
        "disable_full_argument_type_validation": {
          "kind": "enabled"
        }
     }
}

Major features

@​alias fragment aliases released as stable

Aliased fragments are a Relay feature that lets you access fragments spreads and inline fragments as named properties. This can be especially helpful for fragments which might be conditionally fetched due to @skip/@include or type conditions which might not match. With @alias these fragments get typed as nullable properties allowing you to check at runtime if they've matched or not before trying to use the data.

Read more about @​alias

@​catch

@catch, enabled by default will let you check at runtime if a field errored. This can allow you to disambiguate between true nulls returned by your server, and fields which are null due to field level errors.

Read more about @​catch

@​throwOnFieldError

@throwOnFieldError can be added to fragments and queries and will cause any field errors within that fragment/query to throw when read. This ensures that all null values you encounter are true nulls as returned by your field resolvers on the server, and not field level errors that have been coerced to null.

Read more about @​throwOnFieldError

Semantic Nullability

@throwOnFieldError unlocks a powerful new feature when combined with a schema that has fields annotated with @semanticNonNull. @semanticNonNull can be added to fields which have been made nullable in the schema only to enable more robust error handling, but are not expected to return null expect in the case of errors.

Within fragments or queries annotated with @throwOnFieldError, fields annotated with @semanticNonNull will be typed as non-nullable. This has the potential to dramatically reduce the number of null checks you need to perform inside your product code, while also making your product code more "correct" by treating all field errors as explicit errors.

Read more about Semantic Nullability

Relay Resolvers can now have access to context

Thanks for Mark Polak and Drew Atkinson from Microsoft, Relay Resolvers can now be configured to accept a shared context object, similar to standard GraphQL resolvers.

Pull Request

Read more about Resolver context

Ability to opt out of Relay Compiler source control integration

Thanks also to for Mark Polak from Microsoft, the Relay compiler config now supports the option "noSourceControl": true which will ask the Relay compiler to not automatically try to add/remove files from Git or Mercurial.

Pull Request

Editor Integration Improvements

Thanks to Tobias Tengler, Relay's editor support now includes:

• Intellisense (autocomplete, hover tooltips, diagnostics) for the Relay config file. This fills a critical gap since the Relay config is quite under-documented. (#​4724) by tobias-tengler
  • Editor integration (#​4724) by tobias-tengler
  • Generate JSON schema for compiler config (#​4723) by Jordan Eldredge
• Rename refactoring tools (#​4581) by tobias-tengler
• Add Inlay Hints for Fragment arguments (#​4740) by tobias-tengler
• Improved documentation links in errors and hover tooltips (#​4741) by tobias-tengler

Additional runtime logging integrations

• [9b24ad]: Log notify stats by Tianyu Yao
• [ed8a7f]: Add logging for DataChecker by Tianyu Yao
• [462b01]: Add logging for store lookup by Tianyu Yao
• [1faea5]: Add more loggings for GC by Tianyu Yao
• [f42215]: Add more information to execute.next log by Tianyu Yao

Additional Improvements

• [e84b10]: Inline enum values in hot code paths by Jan Kassens
• [ebd987]: Strictify relay entrypoint typing by Sam Zhou
• [989ebf]: Improve error reporting for argument type errors by Jordan Eldredge
• [3ba54c]: Use more precise variance for some relay types by Sam Zhou
• [9f0e9e]: Improve schema-validation error messaging by Steven Chaitoff
• [eec960]: Report schema parsing errors for synced schema sources (#​4719) by tobias-tengler
• [176f96]: Parallelize dumping schemas to disk by Deepak Singh
• [e492d7]: Fix out of date component name in Mutations & Updates by Lynn Yu
• [0f49c2]: Skip importing export types in TS (#​4754) by Drew Atkinson
• [aba9e9]: Ignore null/undefined queries in entrypoints by Jordan Eldredge
• [d5f1a0]: Correctly report unaliased fragments within inline fragment with @​skip by Jordan Eldredge
• [2ad28f]: Disallow Node refetchable query on interfaces without implementations by Tianyu Yao
• [c446d4]: Fix Relay incremental build for enums by Evan Yeung
• [7998bc]: Support multiple @​module fragments in the same selection if they have @​alias (#​4744) by Jordan Eldredge
• [df2aca]: I think we could allow @​module in the same selection if they have different keys by Jordan Eldredge
• [294cb8]: Ensure we strip alias metadata from selections within inline fragments by Jordan Eldredge
• [531c6f]: Fix syntax error when using the new relay resolver by Tianyu Yao
• [6e47ac]: Return and handle all required_on_non_null_field errors by Gordy French
• [2b5028]: Ensure documents are synced before calculating completions #​4473 by Jordan Eldredge
• [c43429]: Add editor support for JSON config schema (#​4724) by tobias-tengler
• [4d2fe9]: Error on multiple graphql type definitions on one flow type by Tianyu Yao
• [99003d]: Prevent using @​alias within @​match by Jordan Eldredge
• [7491d3]: Update relay resolve API doc by Tianyu Yao
• [5d1225]: Fix incremental build when enum field argument changes by Monica Tang
• [0c5d69]: Support incremental schema change for union changes by Lynn Yu
• [d53615]: Refactor alias to always use inline fragments (and compose with other features) by Jordan Eldredge
• [86800e]: Add compiler command to emit json schema of config file by Jordan Eldredge
• [80e041]: Minor spell checking by Gordy French
• [6a2c39]: Validate that @​match fields always have supported arg by Jordan Eldredge
• [7bd521]: Only validate alias within each selection set by Jordan Eldredge
• [44cbff]: Support Client Edge to Client Union for strong types by Monica Tang
• [d35688]: Avoid reading inline fragments if abstract type condition does not match by Jordan Eldredge
• [3787b8]: Handle case where @​required bubbles to @​aliased inline fragment on abstract type by Jordan Eldredge
• [349334]: @​required should bubble nullable to parent semantic-non-null linked field by Gordy French
• [f96121]: Allow abstract inline fragments to be omitted by Daniel Lo Nigro
• [43bd9b]: Revert D542067: Validate edgeTypeName argument points to an existing type by Amy Hwang

Documentation Improvements

• [c54830]: Docs for @​catch by Itamar Kestenbaum
• [f07f56]: Update semantic nullability docs to remove feature flag that is no-longer needed by Jordan Eldredge
• [861caa]: Fill in definitions for @​stream and @​stream_connection in Glossary by Lynn Yu
• [e46ba9]: Document current support for experimental semantic nullability (#​4770) by Jordan Eldredge
• [642e03]: Add definitions for @​live and @​live_query to glossary by Lynn Yu
• [27b2a1]: Document resolvers constants by Jordan Eldredge
• [175098]: @​throwOnFieldError documentation by Gordy French
• [794cc3]: Pagination documentation fixes by Lynn Yu
• [23a7c2]: Fix the connection key in the mutations tutorial (#​4751) by Sviatoslav Abakumov
• [bf6153]: Fix small errors in docs by Lynn Yu
• [99f4f6]: Organize sidebar for oss site by Evan Yeung
• [0ab687]: Re-organize hierarchy of docs interally by Evan Yeung
• [aa6538]: UseQueryLoader clarification by Monica Tang
• [9f314a]: Fix GraphQL Field name for story thumbnail examples by Jerry Francois
• [285dc2]: Spelling and capitalization by Gordy French
• [0e57c3]: Fix unclosed jsx tag by Monica Tang
• [7fccac]: Fix minor typo in editor-support.md (#​4721) by SY Ryu
• [c632b4]: Link to Relay website @​defer @​stream docs by Monica Tang
• [d61ce0]: S/class/className/ in MDX (#​4716) by Paul O’Shannessy
• [98d76c]: Add instructions to run relay compiler after query update (#​4718) by Matthew Pawley
• [dbae5c]: Link GQL node definition in useRefetchableFragment section by Danny Zou

Miscellaneous

• [457e0c]: Update relay compiler README by Monica Tang
• [36e9ea]: Remove loadQuery during render warning (#​4731) by Jordan Eldredge

Experimental Changes

• [8cb637]: Support in useFragmentInternal by Joe Savona
• [9125e2]: Support returning an interface in IdOf by Tianyu Yao
• [a1ce49]: Schemagen should allow list items to be true non-null by Gordy French
• [a726fc]: Add semanticNonNull support to generated schemas by Gordy French
• [4a378d]: Add support for global custom scalars by Evan Yeung
• [d3afbb]: Support @​deprecated annotation by Lynn Yu
• [2efe7a]: Add support for fragment arguments by Evan Yeung
• [ce4388]: Add test for conflicting arguments by Evan Yeung
• [f239b7]: Add new relayresolver syntax to documents by Tianyu Yao
• [b26951]: Disallow non-nullable return type by Tianyu Yao
• [2152df]: Support attaching resolver fields onto Query by Tianyu Yao
• [6ddd80]: Map Flow -> GraphQL Scalars in schema gen by Evan Yeung
• [628b42]: Attach locations to parent types by Tianyu Yao
• [884c96]: Resolve return flow types to their flow types by Tianyu Yao
• [a1b186]: Unify processing weak fields by Tianyu Yao
• [217eb3]: Unify processing rootFragment fields by Tianyu Yao
• [5ee605]: Extract module for getting import and export by Tianyu Yao
• [2a3c04]: Fix IdOf Flowtype by Tianyu Yao
• [615020]: Add variable cycle detection by Jordan Eldredge
• [bb6f7b]: Add correct root fragment information by Evan Yeung

And more

There were over 100 additional commits since our last release which have been omitted from this doc

v17.0.0: Version 17.0.0 Release Notes

Compare Source

Since our last release in January of this year, we've made many improvements to Relay. Themes include:

• Improved correctness checking and validation
• Additional editor features
• Experimental features exploring error handling and nullability

Breaking Changes

Schema Validation

Relay compiler now runs spec-compliant schema validation against your schema including client schema extensions and Relay Resolvers. You can opt out of this feature by disabling validation in your Relay compiler config.

// relay.config.json
{
    //...
    "featureFlags": {
       "disable_schema_validation": true
    }
}

[ccc4465] by Jordan Eldredge

Edge Type Validation

We now validate that the names passed to directives like @prependNode and @appendNode are valid typenames. You can opt out of this validation with the following feature flag in your compiler config:

// relay.config.json
{
    //...
    "featureFlags": {
       "disable_edge_type_name_validation_on_declerative_connection_directives": {
          "kind": "enabled"
       }
    }
}

[53b2436] by tobias-tengler

Bug fixes

• [f87e77d]: Fix MockPayloadGenerator for deferred fragments in lists by Fernando Gorodscy
• [24b557a]: Use default values from mock resolver for Relay 3D payload by Andrey Lunyov
• [59ff9c1]: Mark resolves as clean again if we reread their fragment and find data unchanged by Jordan Eldredge
• [0d7a3d0]: Input fields with defaults shouldn't be required (#​4647) by Graeme Coupar
• [7cc4f2b]: Check if condition on defer/stream fragments by Fernando Gorodscy
• [05d64cc]: Update GraphQL parser to consume escaped characters by Monica Tang
• [448aa67]: Fix Flow Types in RelayObservable by Jerry Francois

Improvements

Runtime Improvements

This release includes a new implementation of our hooks which are significantly more efficient in terms of memory use. Thanks to Dave McCabe for his work on this huge project.

• [9f03ea5]: Make new useFragment implementation the default by Andrey Lunyov

Editor Integration Improvements

Huge shout out to community contributor Tobias Tengler for many improvements to our Editor Support via our VSCode extension. Our VSCode extension is powered by the relay-compiler so upgrading to version 17.0.0 of the compiler should unlock a number of great IDE features.

• [dc2cb85]: Add code action to rename fragment (#​4697) by tobias-tengler
• [68c7cca]: Add SchemaDocument go to definition LSP support (#​4669) by tobias-tengler
• [8fd21e7]: Attach previous location to duplicate type diagnostic by Jordan Eldredge
• [dd9d3a0]: Support inlay hints by Jordan Eldredge (Requires upgrading to v2.3.0 of our VSCode extension)
• [964e078]: Activate LSP for schema and schema extension files (#​4652) by tobias-tengler
• [bb41169]: Support go to definition for arguments (#​4605) by tobias-tengler
• [bbddbf3]: Report errors if location provider fails (#​4588) by Jordan Eldredge
• [964e078]: Activate LSP for schema and schema extension files (#​4652) by tobias-tengler

Compiler Performance Improvements

• [232985f]: Parallel watchman queries for saved state and changed files by Gordy French
• [ef22ae6]: Run schema validation in parallel by Jordan Eldredge
• [a7984bc]: Speed up watchman_query_time_before_subscribe by Tianyu Yao
• [acd17ec]: Use multithreaded zstd compression by Gordy French
• [a7984bc]: Speed up watchman_query_time_before_subscribe by Tianyu Yao
• [f7b030e]: Split a project into multiple chunks and parallelize by Tianyu Yao
• [bafd56b]: Parallelize GraphQLAsts::from_graphql_sources by Tianyu Yao
• [69dbfee]: Parallelize from_graphql_sources_map by Tianyu Yao
• [ce12ecf]: Parallelize building schemas by Tianyu Yao
• [586483e]: Parallelize from_file_source_changes by Tianyu Yao
• [ee8523f]: Implement SchemaDocument path resolution (#​4639) by Tobias Tengler
• [5f1eb8a]: Add path resolution for fragment arguments (#​4651) by tobias-tengler
• [6601a35]: Speed up LSP requests outside of GraphQL by Evan Yeung
• [a5a7947]: Incrementally build Enum schema changes by Evan Yeung
• [ce6ea74]: Add go to definition support for type defined in variable definition (#​4629) by tobias-tengler
• [2ba726b]: Add go to definition support for directives (#​4625) by tobias-tengler

Misc. Improvements

• [29d9e55]: Add preferFetchable argument to the @​refetchable directive by Andrey Lunyov
• [f45b35f]: New feature flag that will allow to opt-out @​fetchable types from the node query generation in @​refetchable by Andrey Lunyov
• [9958e56]: Print raw response on persisting parsing error by Tianyu Yao
• [9cf21af]: Integrate with Sapling or Git if they exist (#​4691) by Jon Janzen
• [badd538]: Migrate relay hooks to hook-syntax by Alex Taylor (alta)
• [349b5a8]: Use client schema extension enum values as source of truth for Flow types by Jordan Eldredge
• [d3c8d1c]: Add feature flag for fragment arguments (#​4648) by tobias-tengler
• [9e9428e]: Add support for ENABLE_RELAY_OPERATION_TRACKER_SUSPENSE flag in the the new hooks implementation by Andrey Lunyov

Documentation Improvements

• [acb227a]: Fix search on relay.dev (#​4715) by Paul O’Shannessy
• [6b91a2e]: Improve compiler explorer (#​4698) by Jordan Eldredge
• [4c5cd41]: Add docs for preferFetchable argument by Andrey Lunyov
• [95010c8]: Relay: Update Obsolete Docs Reference to ReactTestUtils by Tim Yung
• [51a82f6]: Document Relay Resolvers (#​4547) by Jordan Eldredge
• [ff8e80d]: Update docs to clarify behavior of refetchable variables with nullable fragment reference by Jordan Eldredge
• [76d6d77]: Demonstrate using custom scalar to replace RelayResolverValue by Jordan Eldredge
• [05cf065]: Fixing minor typo in website (#​4673) by Jeshuran Paul
• [906f5ed]: Relay docs: Fix shell script getting Prism'd as a JS comment by Robin Giese
• [0109168]: Relay docs: Tutorial page should have proper title by Robin Giese
• [ea2cbbc]: Fix typos in the Relay Resolvers docs by Evan Yeung
• [dc36b48]: Fix typos in tutorial by Monica Tang
• [14314f9]: Escape asterisks in README.md (#​4635) by Chris Morin
• [ee03182]: Fix(docs): add instructions about installing watchman if necessary in the tutorial (#​4620) by Mark Feng
• [1256e73]: Remove CodeSandbox Example by Jordan Eldredge
• [b7f59af]: Chore(doc): improve relay compiler doc for persist (#​4608) by eMerzh
• [8e557f9]: Fix typos (#​4597) by Kenneth Lum
• [615c2d2]: Fix(doc): update config name following update (#​4596) by eMerzh

Experimental Changes

We are also continuing to evolve many experimental features which are not yet stable enough to be enabled by default in Relay.

Relay Resolvers

Relay Resolvers have been extended to support defining types which implement interfaces, and define resolvers that return client-defined interfaces where all implementing types are defined using Relay Resolvers. Relay Resolvers are now stable enough to have full documentation with instructions on how to enable them.

• [ba5e48f]: Add model resolvers for interfaces by Monica Tang
• [55b8716]: Return an interface with multiple weak concrete types from a resolver field by Monica Tang
• [46879b4]: Multiple weak models implement an interface by Monica Tang
• [98823ea]: Add model resolvers for unions by Monica Tang
• [245602f]: Remove allow_legacy_verbose_syntax ParseOption by Lynn Yu
• [cdab89f]: Remove ENABLE_CLIENT_EDGES runtime feature flag by Jordan Eldredge
• [b26f3be]: Remove @​outputType feature flag by Monica Tang
• [7ce13bc]: Remove LiveResolverStore from experimental export namespace by Jordan Eldredge
• [f193cda]: Invert the default for emit_normalization_node_for_client_edges by Jordan Eldredge
• [0cac319]: Define resolver on interface with weak types by Monica Tang
• [6bda98c]: Make interface model resolver fields compatible with client schema extension-defined concrete types by Monica Tang
  Additionally, we are exploring the ability to extract Resolver type and field definitions directly from your typed JavaScript code, similar to how Grats works. This work is still highly experimental, only supported for Flow, and not yet fully functional. If you are interested in working with us to help bring this support to TypeScript, please get in touch.
• [722b18f]: Better error message for using an optional flow type for strong objects by Tianyu Yao
• [4267075]: Implement schema generation for weak object fields by Evan Yeung
• [5d2fa70]: Prevent docblock parsing error for new resolver syntax in LSP by Tianyu Yao
• [36802d9]: Properly support nullable strong return type by Tianyu Yao
• [8e5c565]: Add "description" to Flow schema generation by Evan Yeung
• [7e41583]: Fix passing empty documents to schema gen by Tianyu Yao
• [8cce449]: A RelayResolverValue generic by Tianyu Yao
• [0d1b5c2]: Add argument support for Flow schema generation by Evan Yeung
• [95aaa48]: IdOf<> return type by Tianyu Yao
• [5052062]: Support boolean by Tianyu Yao
• [77a87be]: Add root fragment support to relay resolvers by Evan Yeung
• [35f9763]: Pass fragment information to Flow schema generation code by Evan Yeung
• [a8a41e2]: Treat existing resolve syntax fields as fields by Tianyu Yao
• [16e28af]: Add @​live to Flow schema generation by Evan Yeung
• [49563f1]: Fix incorrect error message for Relay Resolver missing function param by Evan Yeung
• [24510ae]: Improve error messages for Relay Resolver schema generation imports by Evan Yeung
• [433c93e]: Improve error messages for resolver schema generation by Evan Yeung
• [d1749df]: Add weak type definitions to Flow resolvers by Evan Yeung
• [8fa3d43]: Crate for extracting type information from JS definitions by Tianyu Yao

@​alias

We've added an experimental new directive to allow fragments to appear as fields. This can enable you, or optionally require you, to check if a fragment was fetched before using it.

• [efab5ab]: Complete @​alias (#​4699) by Jordan Eldredge
• [868183c]: Refine @​alias enforcement by Jordan Eldredge
• [6aaa9ce]: Add directive to opt out of @​alias enforcement by Jordan Eldredge

Error Handling and Semantic Nullability

As part of our involvement with the GraphQL Nullability Working Group we are exploring features to enable explicit error handling and semantic nullability. Neither of these features are officially available yet, but we're excited about what will become possible here.

• [af1f9de]: Disallow required on non-null and semanticNonNull fields by Gordy French
• [56c099a]: Fix non-null-required validator's field traversal by Gordy French
• [470c814]: Create CatchField for @​catch on Scalar by Itamar Kestenbaum
• [38655ec]: Create CatchField for @​catch and throw unimplemented by Itamar Kestenbaum
• [7bfd200]: Emit proper Flow for semanticNonNull RelayResolverValue by Gordy French
• [88a6ff9]: Fix semanticNonNull levels support in resolver docblock by Gordy French
• [c7d46c3]: Create CatchField feature flag by Itamar Kestenbaum
• [696a1b3]: Support @​catch directive in RelayReader by Itamar Kestenbaum
• [d1cf472]: Emit semanticNonNull in generated schema by Gordy French
• [ddfa2b0]: Parse semanticNonNull from docblock by Gordy French
• [145c788]: Add allow_non_null_resolver_fields feature flag by Gordy French
• [cebc7f0]: Experimental support for @​semanticNonNull (#​4601) by Jordan Eldredge

v16.2.0

Compare Source

Minor breaking changes

• [4e68155d732b]: Reuse TypegenConfig for SingleProjectConfigFile (#​4585) by tobias-tengler

This change is a breaking change, as the customScalars config option in the single-project config must now be specified as customScalarTypes.

Added

• [40fe615ad6f8]: @​preloadable Support (#​4515) by tobias-tengler

Bug fixes

• [b995eec40461]: Update config.ts for typo (#​4594) by Orta Therox
• [2f9e88affdc7]: Fix goto references for TerseRelayResolver (#​4587) by tobias-tengler
• [d513e42f881e]: Suspend on active promises for client edge queries in the new hooks implementation by Andrey Lunyov
• [eb0b7fcd991c]: Cleanup outdated records after model/output type resolvers updates by Andrey Lunyov
• [ece1fd953b98]: Fix SDLSchema replacing logic by Deepak Singh
• [d90dedfc577e]: Replace invariant in SuspenseResource with the warning in the case where GC is disabled by Monica Tang
• [9f135b8f92a7]: Fix path on Windows (#​4544) by martin
• [aac57b30e812]: UseFragmentInternal should suspend if environment changes and there is a query in flight by Andrey Lunyov
• [00aabd00be72]: Fix client->client nullable model issue for PluralConcrete object output types by Monica Tang
• [7b3b0779b570]: Fix client->client nullable model issue for SingularConcrete object output types by Monica Tang
• [3873809c2df8]: Handle missed updates from the low-priority state changes in the new hooks implementation by Andrey Lunyov

Improvements

• [0037d05c61d8]: Cleanup allow(unused_imports) by Cameron Pickett
• [ada971e33838]: Disallow some read time features in mutation responses by Jordan Eldredge
• [a2c7ed480e2d]: Relay-compiler diagnostic errors logging improvements (#​4574) by Alex Coleman
• [1a57f0832665]: FIX(Graphql): Add support for input with default values (#​4540) by eMerzh
• [2f97f25e53a1]: Consume LiveState from relay-runtime root in typegen by Jordan Eldredge
• [182a86647000]: Fix missing space in diagnostic location print (#​4573) by Alex Coleman
• [5a18984e4155]: Refactor model resolver codegen to re-use build_reader_relay_resolver by Monica Tang
• [1972913c2d12]: Augment corpus digraph logic to intake a vec of TextSource by Monica Tang
• [06cb092ae28f]: Implement compiler command to get graphql text sources and program by Monica Tang
• [1a06f3269985]: Use Parameters and indexed access type to extract PreloadParams by Sam Zhou
• [5cf0af11be92]: Update print_schema to support ARGUMENT_DEFINITION and INPUT_FIELD_DEFINITION directives by James Wren
• [4c25549bcb1a]: More strict selectors equal check by Tianyu Yao

Documentation Improvements

• [8392b68a5137]: Document directives argument for @refetchable (#​4520) by Daniel Lo Nigro
• [8ef4b47e69d0]: Document current behavior of server edges returning null by Jordan Eldredge
• [361d0b3fae9f]: Typo fix (#​4561) by Randall Bennett
• [921f2a8715a1]: Fix(docs): normalize local data updates doc (#​4564) by Guilherme

Miscellaneous

• [4619f9706d97]: Add a json output option by Tianyu Yao
• [49e4da17abbc]: Make compiler results seriaizable by Tianyu Yao

Experimental Changes

• [5718ca9fd9b2]: Transform to convert fragments and linked fields on abstract types to inline fragment by Monica Tang
• [399bf9201eba]: 6/n - Add tests for errorResponseFields by Itamar Kestenbaum
• [27a062376ce3]: 5/n - Add erroring on seeing relayFieldErrors by Itamar Kestenbaum
• [12d169fc9c23]: 4/n - Add logging on seeing relayFieldErrors by Itamar Kestenbaum
• [0a9d473edeee]: 3/n - Add RelayFieldError and rename RelayFieldError to TRelayFieldError by Itamar Kestenbaum
• [914794c4ddba]: 2/n - Rename requiredFieldLogger to relayFieldLogger by Itamar Kestenbaum
• [af4afbdc2ab3]: 1/n - Add field errors to Snapshot by Itamar Kestenbaum
• [08c32cfede3b]: Integration test for resolvers implementing fields for interface by Jordan Eldredge
• [396a1dbfb8cd]: Expose live resolver modules outside of experimental-live-resolvers directory by Jordan Eldredge
• [bac5f9c790a9]: Update for normalization node changes by Bhuwan Khattar
• [8dd004f4711a]: Add apply_to_normalization_ast config for resolvers_schema_module by Bhuwan Khattar

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Full Changelog: facebook/relay@v16.1.0...v16.2.0

v16.1.0

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Added

• [b683e8c2c355]: Add validations for custom scalar arguments by Alex Danoff
  Enable flag enable_strict_custom_scalars to perform validations when custom scalar types are used, to check that the user doesn't try to pass literal values (strings, ints, etc) in positions where a custom scalar type is expected, as this can break type safety since Relay can't know whether those literals conform to the underlying custom type.

Bug fixes

• [b379edf30a6e]: Handle the document type change from Query to Fragment by Andrey Lunyov
• [5ffcdbcf0114]: Fix missing validation for global variables in client-edges (#​4513) by Andrey Lunyov
• [8e0949d6d90a]: Apply fragment renaming to resolver fields by Jordan Eldredge

Improvements

• [dfad61878904]: Fix types in RelayMockPayloadGenerator.js by George Zahariev
• [24ef22b4946c]: Adopt conditional type for useRefetchableFragment related functions by Sam Zhou
• [400cfa841445]: Refactor extra typegen config fields into TypegenOptions struct by Monica Tang
• [e694ba8792a6]: Use conditional type to power EntryPointElementConfig by Sam Zhou
• [1cc9d937ea1a]: Refactor extra artifact project config fields into extra_artifacts_config by Monica Tang
• [cf0fb394dbb6]: Incremental build compatible ResolversSchemaModule by Bhuwan Khattar
• [0d429f796e69]: Implement fmt::Display for SchemaChange by Monica Tang
• [d48a0e025385]: Fix RelayResolverModel-test by Monica Tang
• [ab92df525948]: Use placeholder in connection warning by Jan Kassens
• [6519571a092a]: Shallow freeze resolver value by Tianyu Yao
• [7f54255c92ea]: Do not mutate a shallowly frozen subtree by Tianyu Yao
• [[904924c6925b](https://

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