meta/relay v1.6.1 on GitHub

Potentially Breaking:

Bump graphql peer dependency to ^0.13.0
Use React.forwardRef. This is a breaking change for people relying on the relayContainer.refs.component implementation detail.

New:

Introduce @relay(mask: false) directive for fragment *definitions: *Applied to a fragment definition, @relay(mask: false) changes the generated Flow types to be more usable when the fragment is spread with the same directive; The Flow types will no longer be exact objects and no longer contain internal marker fields.

Fixed:

Fix pagination after using refetchConnection in Pagination Container
Use aliases for __typename generated fields in the union (#2465)
Fix issue in React Async mode where container would render inconsistent data if rendering was interrupted.
RelayConnectionHandler now properly writes page_info after refetching a connection
Fix issue where RelayContainerUtils didn't recognize React.forwardRef as React.Component
Properly guard agains errors thrown inside mutation or subscription updater functions

Improved:

De-hastify relay-runtime, set main entry in relay-runtime package.json.
dedupeJSONStringify is now more effective
Speed up relay-compiler by caching client schema extensions.
Expose applyOptimisticUpdate on RelayModern.
relay-compiler can now compile JS files with optionalChaining syntax.
relay-compiler can now compile JS files with nullishCoalescingOperator syntax.
relay-compiler can now compile JS files with optionalCatchBinding syntax.
relay-compiler has better warnings when required variables are not passed in.
relay-compiler now generates operation Flow types: 5d83328.
Bump fbjs dependency to 0.8.17.
Bump fast-glob dependency to 2.2.2.
Several documentation improvements.