From 9384f5399da39e53855beb8e7f8ded1aa56bf72e Mon Sep 17 00:00:00 2001
From: syuilo <Syuilotan@yahoo.co.jp>
Date: Tue, 27 Dec 2022 14:36:33 +0900
Subject: rename: client -> frontend

---
 packages/frontend/src/scripts/clone.ts | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 packages/frontend/src/scripts/clone.ts

(limited to 'packages/frontend/src/scripts/clone.ts')

diff --git a/packages/frontend/src/scripts/clone.ts b/packages/frontend/src/scripts/clone.ts
new file mode 100644
index 0000000000..16fad24129
--- /dev/null
+++ b/packages/frontend/src/scripts/clone.ts
@@ -0,0 +1,18 @@
+// 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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