Nyoba buat formula di typescript

formula.ts

import { run } from "formula";

enum RumusType {
  OPERATOR,
  VARIABLE,
  FIXEDVALUE,
}

interface Rumus {
  urutan: number;
  exp: string;
  description: string;
  type: RumusType;
}

const rumus: Rumus[] = [
  {
    urutan: 1,
    exp: "keliling",
    description: "Ukuran keliling benda",
    type: RumusType.VARIABLE,
  },
  {
    urutan: 2,
    exp: "*",
    description: "Kali",
    type: RumusType.OPERATOR,
  },
  {
    urutan: 3,
    exp: "1500000",
    description: "Nilai harga per meter keliling",
    type: RumusType.FIXEDVALUE,
  },
];

const injectFormula = (rumus: Rumus[]) => {
  let formula: string = "";
  for (const rms of rumus) {
    formula = formula + rms.exp;
  }
  return formula;
};

const result = run(injectFormula(rumus), { keliling: 2 });
console.log(result);