column_formatter.js

  prepare_report_data(data) {
    this.data = data;

    // prepare columns
    this.data.columns.forEach((t) => {
      t.title = t.label;
      t.field = t.fieldname;
    });
    // set column cell formatter for known fieldtypes, if not provided already in report_settings
    // list of Tabulator formatters:  http://tabulator.info/docs/4.9/format
    this.data.columns.forEach((col) => {
      if (!col.formatter) {
        this.set_column_formatter(col);
      }
    });
  }

  set_column_formatter(col) {
    if (!col.fieldtype || col.fieldtype == "") {
      if (
        this.data &&
        this.data.result &&
        this.data.result.length &&
        frappe.utils.is_html(this.data.result[0][col.fieldname])
      )
        col.formatter = "html";
    } else if (col.fieldtype == "Link") {
      col.formatter = function (cell) {
        return `<a href='desk#Form/${
          col.options
        }/${cell.getValue()}'>${cell.getValue()}</a>`;
      };
    }
  }