import type { ElementLike } from '../core/Types';
import type { CommandContext } from './CommandStack';
/**
 * A command handler that may be registered via
 * {@link CommandStack#registerHandler}.
 */
export default interface CommandHandler {
    /**
     * Execute changes described in the passed action context.
     *
     * @param context The execution context.
     *
     * @return The list of diagram elements that have changed.
     */
    execute?(context: CommandContext): ElementLike[];
    /**
     * Revert changes described in the passed action context.
     *
     * @param context The execution context.
     *
     * @return The list of diagram elements that have changed.
     */
    revert?(context: CommandContext): ElementLike[];
    /**
     * Return true if the handler may execute in the given context.
     *
     * @param context The execution context.
     *
     * @return Whether the command can be executed.
     */
    canExecute?(context: CommandContext): boolean;
    /**
     * Execute actions before the actual command execution but
     * grouped together (for undo/redo) with the action.
     *
     * @param context The execution context.
     */
    preExecute?(context: CommandContext): void;
    /**
     * Execute actions after the actual command execution but
     * grouped together (for undo/redo) with the action.
     *
     * @param context The execution context.
     */
    postExecute?(context: CommandContext): void;
}