import type { BaseHTMLAttributes, HtmlHTMLAttributes, HTMLAttributes, LinkHTMLAttributes, MetaHTMLAttributes, ReactNode, ScriptHTMLAttributes, StyleHTMLAttributes } from 'react';
export type BaseProps = BaseHTMLAttributes<HTMLBaseElement>;
export type BodyProps = HTMLAttributes<HTMLBodyElement>;
export type HtmlProps = HtmlHTMLAttributes<HTMLHtmlElement>;
export type LinkProps = LinkHTMLAttributes<HTMLLinkElement>;
export type MetaProps = MetaHTMLAttributes<HTMLMetaElement>;
export type NoscriptProps = HTMLAttributes<HTMLElement> & {
    innerHTML?: string;
};
export type ScriptProps = ScriptHTMLAttributes<HTMLScriptElement> & {
    innerHTML?: string;
};
export type StyleProps = StyleHTMLAttributes<HTMLStyleElement> & {
    cssText?: string;
};
export type TitleProps = HTMLAttributes<HTMLTitleElement>;
export type HelmetChildProps = BaseProps | BodyProps | HtmlProps | LinkProps | MetaProps | NoscriptProps | ScriptProps | StyleProps | TitleProps;
/**
 * String data for title.
 */
export type StringData = {
    title?: string;
    titleTemplate?: string;
};
export type HelmetTags = {
    baseTag: HTMLBaseElement[];
    linkTags: HTMLLinkElement[];
    metaTags: HTMLMetaElement[];
    noscriptTags: HTMLElement[];
    scriptTags: HTMLScriptElement[];
    styleTags: HTMLStyleElement[];
};
export type HelmetDatum<T = ReactNode> = {
    toString(): string;
    toComponent(): T;
};
export type HelmetHTMLBodyDatum = HelmetDatum<HTMLAttributes<HTMLBodyElement>>;
export type HelmetHTMLElementDatum = HelmetDatum<HTMLAttributes<HTMLHtmlElement>>;
export type HelmetServerState = {
    base: HelmetDatum;
    bodyAttributes: HelmetHTMLBodyDatum;
    htmlAttributes: HelmetHTMLElementDatum;
    link: HelmetDatum;
    meta: HelmetDatum;
    noscript: HelmetDatum;
    script: HelmetDatum;
    style: HelmetDatum;
    title: HelmetDatum;
    titleAttributes?: HelmetDatum;
    priority: HelmetDatum;
};
export type StateUpdate = HelmetTags & {
    bodyAttributes: BodyProps;
    defer: boolean;
    htmlAttributes: HtmlProps;
    onChangeClientState: (newState: StateUpdate, addedTags: Partial<HelmetTags>, removedTags: Partial<HelmetTags>) => void;
    title: string;
    titleAttributes: TitleProps;
};
export type OnChangeClientState = (newState: StateUpdate, addedTags: Partial<HelmetTags>, removedTags: Partial<HelmetTags>) => void;
/**
 * A subset of <Helmet> properties, corresponding to prop arrays for
 * elements that may be present in DOM multiple times.
 */
export type HelmetPropArrays = {
    link?: LinkProps[];
    meta?: MetaProps[];
    noscript?: NoscriptProps[];
    script?: ScriptProps[];
    style?: StyleProps[];
};
export type PropArrayItem<T extends keyof HelmetPropArrays> = Exclude<HelmetPropArrays[T], undefined>[number];
/**
 * A subset of <Helmet> properties, corresponding to props for elements
 * that may be present in DOM a single time at most.
 */
export type HelmetPropObjects = {
    bodyAttributes?: BodyProps;
    htmlAttributes?: HtmlProps;
    titleAttributes?: TitleProps;
};
export type HelmetPropBooleans = {
    prioritizeSeoTags?: boolean;
};
/**
 * Properties accepted by <Helmet> components.
 */
export type HelmetProps = HelmetPropArrays & HelmetPropObjects & HelmetPropBooleans & {
    base?: BaseProps;
    children?: ReactNode;
    defaultTitle?: string;
    defer?: boolean;
    encodeSpecialCharacters?: boolean;
    onChangeClientState?: OnChangeClientState;
    title?: string;
    titleTemplate?: string;
};
export type RegisteredHelmetPropsArray = Array<[id: string, props: HelmetProps]>;
/**
 * The overall Helmet state, aggregated from props of all <Helmet> instances
 * registered with the Helmet context provider.
 */
export type AggregatedState = {
    base: BaseProps | undefined;
    bodyAttributes: BodyProps | undefined;
    defer: boolean | undefined;
    encodeSpecialCharacters: boolean;
    htmlAttributes: HtmlProps | undefined;
    links: LinkProps[] | undefined;
    meta: MetaProps[] | undefined;
    noscript: NoscriptProps[] | undefined;
    onChangeClientState: OnChangeClientState | undefined;
    priority: {
        links: LinkProps[] | undefined;
        meta: MetaProps[] | undefined;
        script: ScriptProps[] | undefined;
    } | undefined;
    script: ScriptProps[] | undefined;
    style: StyleProps[] | undefined;
    title: string | undefined;
    titleAttributes: TitleProps | undefined;
};
export type MappedServerState = HelmetTags & {
    encode?: boolean;
};
/**
 * Server-side rendering context.
 */
export type HelmetDataContext = {
    helmet?: HelmetServerState;
};
/**
 * The value of internal context used by Helmet to communicate between its
 * context provider and <Helmet> components within its children tree.
 */
export type ContextValue = {
    clientApply: () => void;
    /** One function to register, update, and un-register <Helmet> instances
     *  (or, more precisely their current aggregated props, aggregated between
     *  the actual props of <Helmet> instance and its children). */
    update: (id: string, props: HelmetProps | undefined) => void;
};
export type HelmetProviderHeap = {
    firstRender: boolean;
    helmets: RegisteredHelmetPropsArray;
    nextAnimFrameId?: number;
    serverState?: HelmetServerState;
    state: AggregatedState | undefined;
};