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declare function func<T extends string>(arg: { keys: T[] }): { readonly keys: T[]; readonly firstKey: T; };
function func1() {
const { firstKey } = func({keys: ["aa", "bb"]})
const a: "aa" | "bb" = firstKey;
const { keys } = func({keys: ["aa", "bb"]})
const b: ("aa" | "bb")[] = keys;
}
function func2() {
const { keys, firstKey } = func({keys: ["aa", "bb"]})
const a: "aa" | "bb" = firstKey;
const b: ("aa" | "bb")[] = keys;
}
function func3() {
const x = func({keys: ["aa", "bb"]})
const a: "aa" | "bb" = x.firstKey;
const b: ("aa" | "bb")[] = x.keys;
}
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