grafana/public/app/core/mod_defs.d.ts

declare module 'app/core/controllers/all' {
  let json: any;
  export { json };
}

declare module 'app/core/routes/all' {
  let json: any;
  export { json };
}

declare module 'app/core/services/all' {
  let json: any;
  export default json;
}