import * as Shift from 'shift-ast';
export default class CleanupHelper {
    /**
     * Cleans up any useless code.
     * @param ast The AST.
     */
    static cleanup(ast: Shift.Script): void;
    /**
     * Returns whether a node is a variable declaration statement with no
     * declarators.
     * @param node The AST node.
     */
    private static isEmptyVariableDeclarationStatement;
}