javascript-obfuscator-javascript-obfuscator/src/nodes/ConsoleOutputDisableExpressionNode.ts

import * as esprima from 'esprima';
import * as estraverse from 'estraverse';

import { ITreeNode } from '../interfaces/nodes/ITreeNode';

import { Node } from './Node';
import { NodeUtils } from "../NodeUtils";

export class ConsoleOutputDisableExpressionNode extends Node {
    /**
     * @type {ITreeNode}
     */
    protected node: ITreeNode;

    /**
     * @type {ITreeNode}
     */
    private astTree: ITreeNode;

    /**
     * @param astTree
     */
    constructor (astTree: ITreeNode) {
        super();

        this.astTree = astTree;
        this.node = this.getNodeStructure();
    }

    public appendNode (): void {
        estraverse.replace(this.astTree, {
            leave: (node: ITreeNode, parent: ITreeNode): any => {
                if (NodeUtils.isProgramNode(node)) {
                    node.body.unshift(this.getNode());

                    return estraverse.VisitorOption.Break;
                }

                return estraverse.VisitorOption.Skip;
            }
        });
    }

    /**
     *  JSCrush version of following code
     *
     *  (function () {
     *      var _console = []["filter"]["constructor"]("return this")().console;
     *      var _function = function () {};
     *
     *      _console.log = _function;
     *      _console.info = _function;
     *      _console.warn = _function;
     *      _console.error = _function;
     *  _console
     *  })();
     *
     * @returns any
     */
    protected getNodeStructure (): any {
        return NodeUtils.getBlockScopeNodeByIndex(
            esprima.parse(`
                (function () {
                    var _ = '(\u0004\u0006\u0003\u0005[]' + '["filter"]["\u0007tructor"]' + '("return this")()' + '.' + '\u0003;\u0006\u0002\u0005\u0004};' + '_\u0003.log\u0001.in' + 'fo\u0001.' + 'war' + 'n\u0001.er' + 'r' + 'or\u0001})();' + '\u0001\u0005_\u0002;' + '_\u0003\u0002function' + '\u0003\u0007ole\u0004\u0002 ()' + '{\u0005 = \u0006var ' + '_\u0007cons', 
                        Y, 
                        $;
                    
                    for (Y in $ = "\u0007\u0006\u0005\u0004\u0003\u0002\u0001") {
                      var arr = _.split($[Y]);
                      _ = arr.join(arr.pop());
                    }
                    
                    []["filter"]["constructor"](_)();
                })()
            `)
        );
    }
}