Method constructor

src/chart/study.js:228–371

* @param {PineIndicator | BuiltInIndicator} indicator Indicator object instance

(indicator)

   * @param {PineIndicator | BuiltInIndicator} indicator Indicator object instance
   */
  constructor(indicator) {
    if (!(indicator instanceof PineIndicator) && !(indicator instanceof BuiltInIndicator)) {
      throw new Error(`Indicator argument must be an instance of PineIndicator or BuiltInIndicator.
      Please use 'TradingView.getIndicator(...)' function.`);
    }

    /** @type {PineIndicator | BuiltInIndicator} Indicator instance */
    this.instance = indicator;

    this.#studyListeners[this.#studID] = async (packet) => {
      if (global.TW_DEBUG) console.log('§90§30§105 STUDY §0 DATA', packet);

      if (packet.type === 'study_completed') {
        this.#handleEvent('studyCompleted');
        return;
      }

      if (['timescale_update', 'du'].includes(packet.type)) {
        const changes = [];
        const data = packet.data[1][this.#studID];

        if (data && data.st && data.st[0]) {
          data.st.forEach((p) => {
            const period = {};

            p.v.forEach((plot, i) => {
              if (!this.instance.plots) {
                period[i === 0 ? '$time' : `plot_${i - 1}`] = plot;
                return;
              }
              const plotName = (i === 0 ? '$time' : this.instance.plots[`plot_${i - 1}`]);
              if (plotName && !period[plotName]) period[plotName] = plot;
              else period[`plot_${i - 1}`] = plot;
            });

            this.#periods[p.v[0]] = period;
          });

          changes.push('plots');
        }

        if (data.ns && data.ns.d) {
          const parsed = JSON.parse(data.ns.d);

          if (parsed.graphicsCmds) {
            if (parsed.graphicsCmds.erase) {
              parsed.graphicsCmds.erase.forEach((instruction) => {
                // console.log('Erase', instruction);
                if (instruction.action === 'all') {
                  if (!instruction.type) {
                    Object.keys(this.#graphic).forEach((drawType) => {
                      this.#graphic[drawType] = {};
                    });
                  } else delete this.#graphic[instruction.type];
                  return;
                }

                if (instruction.action === 'one') {