type Keys = 'option1' | 'option2';
type Flags1 = { [K in Keys]: boolean };
// Flags1はFlags2と等しい
type Flags2 = { option1: boolean; option2: boolean;}
let key = 'name'
let obj={key:'jack'} =>{key:jack}
// [key]:変数keyの値を読み取る
let obj={[key]:'jack'} =>{name:jack}
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