/**
 * GraphQL change rules (change: add-contract-graph-projection, GraphQL phase).
 *
 * The GraphQL rows of the closed rule table in `contract-diff.ts`, over two merged schemas
 * (`mergeGraphqlSchema`). Operations are matched by root KIND and field name — a client writes
 * `query { order }`, never the root type's name, so renaming `Query` to `RootQuery` changes
 * nothing on the wire. Types are matched by name.
 *
 * Nullability follows variance: an OUTPUT may become stricter (`String` → `String!` is safe for
 * every reader) and never looser; an INPUT may become looser (`String!` → `String`) and never
 * stricter. Anything compared only by hash — a directive other than `@deprecated` — is
 * `schema-unassessed`, never silently "no change".
 */
import { type GqlSchema } from '../../analyzer/contract/graphql.js';
import { type ContractChange } from './contract-diff.js';
/** Compare the merged GraphQL schemas of two revisions. */
export declare function diffGraphql(base: GqlSchema, head: GqlSchema): ContractChange[];
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