import { Extension, Transaction, StateField } from '@codemirror/state';
import { DecorationSet } from '@codemirror/view';
import { EditorOverlay } from './editor-overlay';
import { RichChangeKind, RichCommand } from './rich-surface';
/**
 * CodeMirror pieces of the source mode. Only the lazily loaded source runtime
 * imports this module, so none of it reaches a page that never opens the
 * Markdown source.
 */
/** Changes the shell applied: they are already in its document and must not be reported back. */
export declare const externalChange: import('@codemirror/state').AnnotationType<boolean>;
export declare function changeKind(tr: Transaction): RichChangeKind;
export declare const setSourceOverlay: import('@codemirror/state').StateEffectType<EditorOverlay>;
export declare const sourceOverlayField: StateField<DecorationSet>;
export declare const sourceTheme: Extension;
export declare const sourceHighlight: Extension;
export declare function sourceLanguage(math: boolean, highlight: boolean, callouts: boolean): Extension;
export declare function emojiCompletion(): Extension;
export interface SourceInputHandlers {
    command: (command: RichCommand) => void;
    /** Image files pasted or dropped at a source position; false when nothing takes them. */
    files: (files: File[], at: number) => boolean;
    math: () => boolean;
}
export declare function sourceInput(handlers: SourceInputHandlers): Extension;