Sharkey/packages/frontend/src/scripts/clone.ts

19 lines
518 B
TypeScript
Raw Normal View History

2022-11-17 02:31:07 +02:00
// 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;
}
}