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<a href="https://github.com/apollographql/graphql-tools/commit/<a class=hub.com/apollographql/graphql-tools/commit/a9965ec0baced5da30589de8c8a96470ba8d04ca">a9965ec0b<a href="https://github.com/apollographql/graphql-tools/commit/a9965ec0baced5da30589de8c8a96470ba8d04ca">&quot;&gt;compat: minimal changes to support graphql@15 within Apollo Server (#1284)

* Inline `PrintSchemaOptions` type, whose parent module has been moved.

This option will likely be deprecated in `graphql@16`.  For now, we&amp;#39;ll
inline this type into this module to continue emitting it into the
declaration file for `makeRemoteExecutableSchema`.

This is necessary since the TypeScript compiler can no longer resolve its
previous location as `graphql` has moved the location of the `schemaPrinter`
module to `printSchema` in https://github.com/graphql/graphql-js/pull/2426.

cc @IvanGoncharov

* Fix incompatibility between `iterall` and newer TypeScript types.

This wouldn&amp;#39;t be necessary if this project had a `package-lock.json`, but...

* compat: filter extensions prior to passing to `buildASTSchema`.

.@IvanGoncharov originally brought this to my attention when he pointed me to
https://github.com/yaacovCR/graphql-tools-fork/issues/32#issuecomment-571252686
and suggested stripping extension nodes prior to invoking `buildASTSchema`
as a cross-version (v14 &amp;lt;=&amp;gt; v15) approach for interim compatibility on the
v4 series of `graphql-tools`.

The most urgent and pertinent need here from my perspective is to allow
user-exploration of the new `graphql@15` release candidate within Apollo
Server which currently re-exports the entirety of `graphql-tools` (even
though it only relies on small portions of it).

Upon further investigation of the above-referenced issue, it appears that
@yaacovCR had already crafted the solution that @IvanGoncharov had suggested
to me, which I found in </a><a class="double-link" href="https://github.com/apollographql/graphql-tools/commit/<a class="double-link" href="https://github.com/apollographql/graphql-tools/commit/2280eef8ad6c1cbc90c640228eb68094546f60f9">2280eef8a</a>">2280eef8a</a><a href="https://github.com/apollographql/graphql-tools/commit/a9965ec0baced5da30589de8c8a96470ba8d04ca"> within ... (continued)

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