JSFiddle - React, Tailwind, and code Playground

TypeScript

type tsObjType = {
	a: number,
  b: number,
  c: number,
  d: number,
}

const tsObj: tsObjType = {
	a: 1,
  b: 2,
  c: 3,
  d: 4,
} 

Object.keys(tsObj).forEach((key) => {
	console.log(key)
})