import type { AnyFunction, CommandFunction, EditorState, EditorStateProps, EmptyShape, LiteralUnion, ProsemirrorNode, RemirrorJSON, StateJSON } from '@remirror/core-types';
import { ActiveFromExtensions, AnyExtension, AttrsFromExtensions, Helper, HelperNames, HelpersFromExtensions, PlainExtension } from '../extension';
import type { ExtensionHelperReturn } from '../types';
import { HelperDecoratorOptions } from './builtin-decorators';
import { InsertNodeOptions } from './commands-extension';
/**
 * Helpers are custom methods that can provide extra functionality to the
 * editor.
 *
 * @remarks
 *
 * They can be used for pulling information from the editor or performing custom
 * async commands.
 *
 * Also provides the default helpers used within the extension.
 *
 * @category Builtin Extension
 */
export declare class HelpersExtension extends PlainExtension {
    get name(): "helpers";
    /**
     * Add the `html` and `text` string handlers to the editor.
     */
    onCreate(): void;
    /**
     * Check whether the selection is empty.
     */
    isSelectionEmpty(state?: EditorState): Helper<boolean>;
    isViewEditable(state?: EditorState): Helper<boolean>;
    /**
     * Get the full JSON output for the ProseMirror editor state object.
     */
    getStateJSON(state?: EditorState): Helper<StateJSON>;
    /**
     * Get the JSON output for the main ProseMirror `doc` node.
     *
     * This can be used to persist data between sessions and can be passed as
     * content to the `initialContent` prop.
     */
    getJSON(state?: EditorState): Helper<RemirrorJSON>;
    /**
     * @deprecated use `getJSON` instead.
     */
    getRemirrorJSON(state?: EditorState): Helper<RemirrorJSON>;
    /**
     * Insert a html string as a ProseMirror Node.
     *
     * @category Builtin Command
     */
    insertHtml(html: string, options?: InsertNodeOptions): CommandFunction;
    /**
     * A method to get all the content in the editor as text. Depending on the
     * content in your editor, it is not guaranteed to preserve it 100%, so it's
     * best to test that it meets your needs before consuming.
     */
    getText({ lineBreakDivider, state, }?: GetTextHelperOptions): Helper<string>;
    getTextBetween(from: number, to: number, doc?: ProsemirrorNode): Helper<string>;
    /**
     * Get the html from the current state, or provide a custom state.
     */
    getHTML(state?: EditorState): Helper<string>;
    /**
     * Wrap the content in a pre tag to preserve whitespace and see what the
     * editor does with it.
     */
    private textToProsemirrorNode;
}
interface GetTextHelperOptions extends Partial<EditorStateProps> {
    /**
     * The divider used to separate text blocks.
     *
     * @defaultValue '\n\n'
     */
    lineBreakDivider?: string;
}
declare global {
    namespace Remirror {
        interface ManagerStore<Extension extends AnyExtension> {
            /**
             * The helpers provided by the extensions used.
             */
            helpers: HelpersFromExtensions<Extension>;
            /**
             * Check which nodes and marks are active under the current user
             * selection.
             *
             * ```ts
             * const { active } = manager.store;
             *
             * return active.bold() ? 'bold' : 'regular';
             * ```
             */
            active: ActiveFromExtensions<Extension>;
            /**
             * Get the attributes for the named node or mark from the current user
             * selection.
             *
             * ```ts
             * const { attrs } = manager.store;
             *
             * attrs.heading(); // => { id: 'i1238ha', level: 1 }
             * ```
             */
            attrs: AttrsFromExtensions<Extension>;
        }
        interface BaseExtension {
            /**
             * `ExtensionHelpers`
             *
             * This pseudo property makes it easier to infer Generic types of this
             * class.
             *
             * @internal
             */
            ['~H']: this['createHelpers'] extends AnyFunction ? ReturnType<this['createHelpers']> : EmptyShape;
            /**
             * @experimental
             *
             * Stores all the helpers that have been added via decorators to the
             * extension instance. This is used by the `HelpersExtension` to pick the
             * helpers.
             *
             * @internal
             */
            decoratedHelpers?: Record<string, HelperDecoratorOptions>;
            /**
             * A helper method is a function that takes in arguments and returns a
             * value depicting the state of the editor specific to this extension.
             *
             * @remarks
             *
             * Unlike commands they can return anything and may not effect the
             * behavior of the editor.
             *
             * Below is an example which should provide some idea on how to add
             * helpers to the app.
             *
             * ```tsx
             * // extension.ts
             * import { ExtensionFactory } from '@remirror/core';
             *
             * const MyBeautifulExtension = ExtensionFactory.plain({
             *   name: 'beautiful',
             *   createHelpers: () => ({
             *     checkBeautyLevel: () => 100
             *   }),
             * })
             * ```
             *
             * ```
             * // app.tsx
             * import { useRemirrorContext } from '@remirror/react';
             *
             * const MyEditor = () => {
             *   const { helpers } = useRemirrorContext({ autoUpdate: true });
             *
             *   return helpers.beautiful.checkBeautyLevel() > 50
             *     ? (<span>😍</span>)
             *     : (<span>😢</span>);
             * };
             * ```
             */
            createHelpers?(): ExtensionHelperReturn;
        }
        interface StringHandlers {
            /**
             * Register the plain `text` string handler which renders a text string
             * inside a `<pre />`.
             */
            text: HelpersExtension;
            /**
             * Register the html string handler, which converts a html string to a
             * prosemirror node.
             */
            html: HelpersExtension;
        }
        interface ExtensionStore {
            /**
             * Helper method to provide information about the content of the editor.
             * Each extension can register its own helpers.
             *
             * This should only be accessed after the `onView` lifecycle method
             * otherwise it will throw an error.
             */
            helpers: HelpersFromExtensions<Extensions>;
            /**
             * Check which nodes and marks are active under the current user
             * selection.
             *
             * ```ts
             * const { active } = manager.store;
             *
             * return active.bold() ? 'bold' : 'regular';
             * ```
             */
            active: ActiveFromExtensions<Extensions>;
            /**
             * Get the attributes for the named node or mark from the current user
             * selection.
             *
             * ```ts
             * const { attrs } = manager.store;
             *
             * attrs.heading(); // => { id: 'i1238ha', level: 1 }
             * ```
             */
            attrs: AttrsFromExtensions<Extensions>;
        }
        interface ListenerProperties<Extension extends AnyExtension> {
            helpers: HelpersFromExtensions<Extension>;
        }
        interface AllExtensions {
            helpers: HelpersExtension;
        }
    }
    /**
     * The helpers name for all extension defined in the current project.
     */
    type AllHelperNames = LiteralUnion<HelperNames<Remirror.Extensions>, string>;
}
export {};