Revert "Remove deepcopy dependency"

This reverts commit cbf5663179c60abb6d9f1a612027065432500643.

1 files changed, 17 insertions, 0 deletions

diff --git a/src/@types/deepcopy.d.ts b/src/@types/deepcopy.d.ts
new file mode 100644
index 0000000000..3eb08d5772
--- /dev/null
+++ b/src/@types/deepcopy.d.ts
@@ -0,0 +1,17 @@
+declare module 'deepcopy';
+
+declare namespace deepcopy {
+	type DeepcopyCustomizerValueType = 'Object';
+
+	type DeepcopyCustomizer<T> = (
+		value: T,
+		valueType: DeepcopyCustomizerValueType) => T;
+
+	interface DeepcopyOptions<T> {
+		customizer: DeepcopyCustomizer<T>;
+	}
+
+	export function deepcopy<T>(
+		value: T,
+		options?: DeepcopyOptions<T> | DeepcopyCustomizer<T>): T;
+}