continueとreturnでのunion typeの挙動

uniontype.js

// for文内のcontinueはNG
const abc = (arg: (string | number)[]) => {
  for (let i=0;i<arg.length;i++) {
    if (typeof arg[i] === 'string') continue;
    const abc: number = arg[i];
  }
}

// if文のearly returnはOK
const abc2 = (arg: (string | number)[]) => {
 if (typeof arg[0] === 'string') return;
 const abc: number = arg[0];
}