1import { SheetColumnRowKey } from "../../models/common/SheetColumnRowKey";
 2import { Complex } from "../../models/common/Types";
 3import { Converters } from "../../utils/Converters";
 4import { AbstractFormula } from "../AbstractFormula";
 5import { FormulaName } from "../FormulaName";
 6
 7export class ISBLANK extends AbstractFormula {
 8  static SELF: ISBLANK = new ISBLANK();
 9  NAME = FormulaName.ISBLANK;
10
11  internal(origin: SheetColumnRowKey, ...values: Array<Complex>) {
12    AbstractFormula.checkLength(values.length, 1, this.NAME);
13    return Converters.first(this.collateralLookup(origin, values[0])) === null;
14  }
15}