import { ActionsUnion, IGatsbyState, IHtmlFileState, IStaticQueryResultState } from "../types";
export declare function htmlReducer(state: {
    trackedHtmlFiles: Map<string, IHtmlFileState>;
    browserCompilationHash: string;
    ssrCompilationHash: string;
    trackedStaticQueryResults: Map<string, IStaticQueryResultState>;
    unsafeBuiltinWasUsedInSSR: boolean;
} | undefined, action: ActionsUnion): IGatsbyState["html"];