import { GraphQLSchema } from "../type/schema";
import { DocumentNode } from "../language/ast";
import { GraphQLError } from "../error/GraphQLError";

/**
 * A validation rule which reports deprecated usages.
 *
 * Returns a list of GraphQLError instances describing each deprecated use.
 */
export function findDeprecatedUsages(schema: GraphQLSchema, ast: DocumentNode): GraphQLError[];