Add getMainDefinition back to @apollo/client/utilities

[jerelmiller]

Fixes #12722

We recommend this in our docs so we should continue to support this as a public utility.

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Latest commit: cf54a50

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[pkg-pr-new]

npm i https://pkg.pr.new/apollographql/apollo-client/@apollo/client@12725

commit: cf54a50

[github-actions]

size-limit report 📦

Path	Size
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client" (CJS)	42.65 KB (-0.13% 🔽)
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client" (production) (CJS)	37.8 KB (+0.01% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client"	32.66 KB (-0.01% 🔽)
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client" (production)	26.99 KB (-0.09% 🔽)
import { ApolloProvider } from "@apollo/client/react"	5.74 KB (0%)
import { ApolloProvider } from "@apollo/client/react" (production)	959 B (0%)
import { useQuery } from "@apollo/client/react"	7.51 KB (0%)
import { useQuery } from "@apollo/client/react" (production)	2.72 KB (0%)
import { useLazyQuery } from "@apollo/client/react"	6.97 KB (0%)
import { useLazyQuery } from "@apollo/client/react" (production)	2.19 KB (0%)
import { useMutation } from "@apollo/client/react"	6.54 KB (0%)
import { useMutation } from "@apollo/client/react" (production)	1.76 KB (0%)
import { useSubscription } from "@apollo/client/react"	6.65 KB (0%)
import { useSubscription } from "@apollo/client/react" (production)	1.85 KB (0%)
import { useSuspenseQuery } from "@apollo/client/react"	8.51 KB (0%)
import { useSuspenseQuery } from "@apollo/client/react" (production)	3.73 KB (0%)
import { useBackgroundQuery } from "@apollo/client/react"	8.25 KB (0%)
import { useBackgroundQuery } from "@apollo/client/react" (production)	3.5 KB (0%)
import { useLoadableQuery } from "@apollo/client/react"	8.57 KB (+0.05% 🔺)
import { useLoadableQuery } from "@apollo/client/react" (production)	3.82 KB (+0.13% 🔺)
import { useReadQuery } from "@apollo/client/react"	6.51 KB (0%)
import { useReadQuery } from "@apollo/client/react" (production)	1.68 KB (0%)
import { useFragment } from "@apollo/client/react"	6.53 KB (0%)
import { useFragment } from "@apollo/client/react" (production)	1.74 KB (0%)

[jerelmiller]

A lot of these type-casts were unnecessary since TypeScript already narrowed the type based on the .kind check above.

operation is also a non-null property with only 3 operation types, so I went ahead and removed the check here since we can assume GraphQL will always return a valid operation type.

[phryneas]

As an alternative, what do you think about adding operationType as a property on Operation?

That should cover all our documented use cases and even save users from fiddling on AST nodes.