declare module "ext:core/ops" {
  export function op_fjson_parse(source: string): [json: string, error: null] | [json: null, error: string];
  export function op_fjson_stringify(
    source: string,
  ): [text: string, error: null, range: false] | [text: null, error: string, range: boolean];
  export function op_fjson_apply(source: string, overrides: Record<string, unknown>[]): string;
}