fix lint error

Author: mizdra

src/index.ts

@@ -1,5 +1,6 @@
 // MEMO: The tests for this module are covered by `e2e/*.e2e.ts`.
 
+// eslint-disable-next-line n/no-unpublished-import -- types only
 import type { CodegenPlugin } from '@graphql-codegen/plugin-helpers';
 import { generateCode } from './code-generator.js';
 import { normalizeConfig, validateConfig } from './config.js';