import { NgeMonacoContribution } from './monaco-contribution';
/**
 * When a user type a composition key like ^ or \` the editor
 * enter in composition mode, then after the user type any key the editor leave
 * this composition mode an duplicate the character pressed by the user.
 *
 * This bug occurs only on some browsers like firefox and calling this method will prevent this behavior
 * by removing any extra character added by the editor between 2 calls
 * of `onDidCompositionStart` and `onDidCompositionEnd`
 */
export declare class PreventSymbolDuplication implements NgeMonacoContribution {
    private disposable?;
    activate(): void;
    deactivate(): void;
    private preventSymbolDuplicationOnCompositionEnd;
}