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Change upgrade guide for recent PRs #4387

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20 changes: 20 additions & 0 deletions website/pages/upgrade-guides/v16-v17.mdx
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Expand Up @@ -12,6 +12,26 @@ import { Callout } from 'nextra/components'

# Breaking changes

## ESM only

GraphQL.js is now an ESM only library, for CJS builds use GraphQL v16 instead. This decision was made in light
of `require(esm)` becoming a mainline feature in Node.js 20. This removes the dual package hazard from GraphQL.JS as
we stop publishing two distinct versions for CJS and ESM.

## `setEnv`

We've removed the `process.env` check in favor of a more explicit `setEnv` function. By default we'll assume
we are in `production` mode, if you need to run in `development` mode you can do so by calling `setEnv('development')`.

The main check that gets added is the `instanceOf` check, this is used to determine if a value is an instance of
a given type but originates from a different version of the library.

```ts
import { setEnv } from 'graphql';

setEnv('development');
```

## Default values

GraphQL schemas allow default values for input fields and arguments. Historically, GraphQL.js did not rigorously validate or coerce these
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