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import { GraphQLError } from '../../../error/GraphQLError.mjs';
import { getNamedType } from '../../../type/definition.mjs';
import { isIntrospectionType } from '../../../type/introspection.mjs';
/**
* Prohibit introspection queries
*
* A GraphQL document is only valid if all fields selected are not fields that
* return an introspection type.
*
* Note: This rule is optional and is not part of the Validation section of the
* GraphQL Specification. This rule effectively disables introspection, which
* does not reflect best practices and should only be done if absolutely necessary.
*/
export function NoSchemaIntrospectionCustomRule(context) {
return {
Field(node) {
const type = getNamedType(context.getType());
if (type && isIntrospectionType(type)) {
context.reportError(
new GraphQLError(
`GraphQL introspection has been disabled, but the requested query contained the field "${node.name.value}".`,
{
nodes: node,
},
),
);
}
},
};
}
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