import Modification from '../../modification';
import * as Shift from 'shift-ast';
export default class VariableRenamer extends Modification {
    private globalScope;
    private variableNames;
    private usedVariableNames;
    private nameMapping;
    /**
     * Creates a new modification.
     * @param ast The AST.
     */
    constructor(ast: Shift.Script | Shift.Module);
    /**
     * Executes the modification.
     */
    execute(): void;
    /**
     * Finds all variable declarations.
     */
    private collectDeclarations;
    /**
     * Finds all references of variables.
     */
    private collectReferences;
    /**
     * Renames all suitable variables within a given scope and it's
     * children.
     * @param scope The scope.
     */
    private renameVariables;
    /**
     * Returns the name mapping.
     * @returns The name mapping.
     */
    getNameMapping(): any;
    /**
     * Generates a list of unique variable names.
     */
    private generateNames;
    /**
     * Randomly shuffles an array.
     * @param array The array to be shuffled.
     * @returns The shuffled array.
     */
    private shuffleArray;
    /**
     * Returns the next unique variable name.
     * @returns The next variable name.
     */
    private getVariableName;
    /**
     * Records a variable name as used.
     * @param name The variable name.
     */
    private addName;
    /**
     * Returns whether a variable name should be renamed.
     * @param name The variable name.
     * @returns Whether.
     */
    private shouldRename;
}