# Apollo Client 4.3 adds native custom scalar support and safer TypeScript types

DevFeed: [Apollo Client 4.3 adds native custom scalar support and safer TypeScript types](<https://devfeed.tech/articles/custom-scalar-i-hardly-know-her-26981.md>)

Original publisher: [Read original article](<https://www.apollographql.com/blog/custom-scalar-i-hardly-know-her>)

Author: Jerel Miller

Published: 2026-09-15T12:01:05Z

Content type: release

Language: en

Sources: [Apollo Blog](<https://devfeed.tech/sources/apollo-blog.md>)

Topics: [GraphQL](<https://devfeed.tech/topics/graphql.md>), [TypeScript](<https://devfeed.tech/topics/typescript.md>), [Cache](<https://devfeed.tech/topics/cache.md>), [Caching](<https://devfeed.tech/topics/caching.md>), [JSON](<https://devfeed.tech/topics/json.md>)

Tags: [cache](<https://devfeed.tech/tags/cache.md>), [graphql](<https://devfeed.tech/tags/graphql.md>), [json](<https://devfeed.tech/tags/json.md>), [typescript](<https://devfeed.tech/tags/typescript.md>), [upgrade](<https://devfeed.tech/tags/upgrade.md>)

## AI overview

Apollo Client 4.3 adds native custom scalar integration, type-safe cache access, and improved TypeScript handling for incremental GraphQL data.

## Source excerpt

Apollo Client 4.3 is here: native custom scalar support, type-safe cache access, and more consistent @defer and @stream behavior. See what's new and upgrade today.