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// structredCloneが遅いため
// SEE: http://var.blog.jp/archives/86038606.html
type Cloneable = string | number | boolean | null | { [key: string]: Cloneable } | Cloneable[];
export function deepClone<T extends Cloneable>(x: T): T {
if (typeof x === 'object') {
if (x === null) return x;
if (Array.isArray(x)) return x.map(deepClone) as T;
const obj = {} as Record<string, Cloneable>;
for (const [k, v] of Object.entries(x)) {
obj[k] = deepClone(v);
}
return obj as T;
} else {
return x;
}
}
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