### What?
Adds the ability to set custom validation rules on the root `graphQL`
config property and the ability to define custom complexity on
relationship, join and upload type fields.
### Why?
**Validation Rules**
These give you the option to add your own validation rules. For example,
you may want to prevent introspection queries in production. You can now
do that with the following:
```ts
import { GraphQL } from '@payloadcms/graphql/types'
import { buildConfig } from 'payload'
export default buildConfig({
// ...
graphQL: {
validationRules: (args) => [
NoProductionIntrospection
]
},
// ...
})
const NoProductionIntrospection: GraphQL.ValidationRule = (context) => ({
Field(node) {
if (process.env.NODE_ENV === 'production') {
if (node.name.value === '__schema' || node.name.value === '__type') {
context.reportError(
new GraphQL.GraphQLError(
'GraphQL introspection is not allowed, but the query contained __schema or __type',
{ nodes: [node] }
)
);
}
}
}
})
```
**Custom field complexity**
You can now increase the complexity of a field, this will help users
from running queries that are too expensive. A higher number will make
the `maxComplexity` trigger sooner.
```ts
const fieldWithComplexity = {
name: 'authors',
type: 'relationship',
relationship: 'authors',
graphQL: {
complexity: 100, // highlight-line
}
}
```
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