配列要素の作成

[...Array(2000).keys()]

const repeatStr = (value:string,times:number):string[] => {
  return new Array(times).fill(value);
}

console.log(repeatStr("hello",3));

const generateDummyItem=(num)=>{
  return new Array(num).fill(null).map((item,index)=>`item ${index}`);
}