js2flowchart/src/shared/utils/treeLevelsPointer.js

> Why? While I've been working on [Under-the-hood-ReactJS](https://github.com/Bogdan-Lyashenko/Under-the-hood-ReactJS) I spent enormous amount of time on creating schemes. Each change in code or flowchart affects all entire scheme instantly, forcing you t

export const setupPointer = cache => ({
    list: cache ? [cache] : [],

    getCurrent() {
        if (!this.list.length) return;
        return this.list[this.list.length - 1];
    },

    stepIn(step) {
        this.list.push(step);
    },

    stepOut() {
        this.list.pop();
    }
});