Index: frontend/node_modules/klona/full/index.d.ts
===================================================================
--- frontend/node_modules/klona/full/index.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/klona/full/index.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1 @@
+export function klona<T>(input: T): T;
Index: frontend/node_modules/klona/full/index.js
===================================================================
--- frontend/node_modules/klona/full/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/klona/full/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,55 @@
+function set(obj, key, val) {
+	if (typeof val.value === 'object') val.value = klona(val.value);
+	if (!val.enumerable || val.get || val.set || !val.configurable || !val.writable || key === '__proto__') {
+		Object.defineProperty(obj, key, val);
+	} else obj[key] = val.value;
+}
+
+function klona(x) {
+	if (typeof x !== 'object') return x;
+
+	var i=0, k, list, tmp, str=Object.prototype.toString.call(x);
+
+	if (str === '[object Object]') {
+		tmp = Object.create(x.__proto__ || null);
+	} else if (str === '[object Array]') {
+		tmp = Array(x.length);
+	} else if (str === '[object Set]') {
+		tmp = new Set;
+		x.forEach(function (val) {
+			tmp.add(klona(val));
+		});
+	} else if (str === '[object Map]') {
+		tmp = new Map;
+		x.forEach(function (val, key) {
+			tmp.set(klona(key), klona(val));
+		});
+	} else if (str === '[object Date]') {
+		tmp = new Date(+x);
+	} else if (str === '[object RegExp]') {
+		tmp = new RegExp(x.source, x.flags);
+	} else if (str === '[object DataView]') {
+		tmp = new x.constructor( klona(x.buffer) );
+	} else if (str === '[object ArrayBuffer]') {
+		tmp = x.slice(0);
+	} else if (str.slice(-6) === 'Array]') {
+		// ArrayBuffer.isView(x)
+		// ~> `new` bcuz `Buffer.slice` => ref
+		tmp = new x.constructor(x);
+	}
+
+	if (tmp) {
+		for (list=Object.getOwnPropertySymbols(x); i < list.length; i++) {
+			set(tmp, list[i], Object.getOwnPropertyDescriptor(x, list[i]));
+		}
+
+		for (i=0, list=Object.getOwnPropertyNames(x); i < list.length; i++) {
+			if (Object.hasOwnProperty.call(tmp, k=list[i]) && tmp[k] === x[k]) continue;
+			set(tmp, k, Object.getOwnPropertyDescriptor(x, k));
+		}
+	}
+
+	return tmp || x;
+}
+
+exports.klona = klona;
Index: frontend/node_modules/klona/full/index.min.js
===================================================================
--- frontend/node_modules/klona/full/index.min.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/klona/full/index.min.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1 @@
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports):"function"==typeof define&&define.amd?define(["exports"],t):t(e.klona={})}(this,(function(e){function t(e,t,r){"object"==typeof r.value&&(r.value=o(r.value)),r.enumerable&&!r.get&&!r.set&&r.configurable&&r.writable&&"__proto__"!==t?e[t]=r.value:Object.defineProperty(e,t,r)}function o(e){if("object"!=typeof e)return e;var r,n,c,a=0,f=Object.prototype.toString.call(e);if("[object Object]"===f?c=Object.create(e.__proto__||null):"[object Array]"===f?c=Array(e.length):"[object Set]"===f?(c=new Set,e.forEach((function(e){c.add(o(e))}))):"[object Map]"===f?(c=new Map,e.forEach((function(e,t){c.set(o(t),o(e))}))):"[object Date]"===f?c=new Date(+e):"[object RegExp]"===f?c=new RegExp(e.source,e.flags):"[object DataView]"===f?c=new e.constructor(o(e.buffer)):"[object ArrayBuffer]"===f?c=e.slice(0):"Array]"===f.slice(-6)&&(c=new e.constructor(e)),c){for(n=Object.getOwnPropertySymbols(e);a<n.length;a++)t(c,n[a],Object.getOwnPropertyDescriptor(e,n[a]));for(a=0,n=Object.getOwnPropertyNames(e);a<n.length;a++)Object.hasOwnProperty.call(c,r=n[a])&&c[r]===e[r]||t(c,r,Object.getOwnPropertyDescriptor(e,r))}return c||e}e.klona=o}));
Index: frontend/node_modules/klona/full/index.mjs
===================================================================
--- frontend/node_modules/klona/full/index.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/klona/full/index.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,53 @@
+function set(obj, key, val) {
+	if (typeof val.value === 'object') val.value = klona(val.value);
+	if (!val.enumerable || val.get || val.set || !val.configurable || !val.writable || key === '__proto__') {
+		Object.defineProperty(obj, key, val);
+	} else obj[key] = val.value;
+}
+
+export function klona(x) {
+	if (typeof x !== 'object') return x;
+
+	var i=0, k, list, tmp, str=Object.prototype.toString.call(x);
+
+	if (str === '[object Object]') {
+		tmp = Object.create(x.__proto__ || null);
+	} else if (str === '[object Array]') {
+		tmp = Array(x.length);
+	} else if (str === '[object Set]') {
+		tmp = new Set;
+		x.forEach(function (val) {
+			tmp.add(klona(val));
+		});
+	} else if (str === '[object Map]') {
+		tmp = new Map;
+		x.forEach(function (val, key) {
+			tmp.set(klona(key), klona(val));
+		});
+	} else if (str === '[object Date]') {
+		tmp = new Date(+x);
+	} else if (str === '[object RegExp]') {
+		tmp = new RegExp(x.source, x.flags);
+	} else if (str === '[object DataView]') {
+		tmp = new x.constructor( klona(x.buffer) );
+	} else if (str === '[object ArrayBuffer]') {
+		tmp = x.slice(0);
+	} else if (str.slice(-6) === 'Array]') {
+		// ArrayBuffer.isView(x)
+		// ~> `new` bcuz `Buffer.slice` => ref
+		tmp = new x.constructor(x);
+	}
+
+	if (tmp) {
+		for (list=Object.getOwnPropertySymbols(x); i < list.length; i++) {
+			set(tmp, list[i], Object.getOwnPropertyDescriptor(x, list[i]));
+		}
+
+		for (i=0, list=Object.getOwnPropertyNames(x); i < list.length; i++) {
+			if (Object.hasOwnProperty.call(tmp, k=list[i]) && tmp[k] === x[k]) continue;
+			set(tmp, k, Object.getOwnPropertyDescriptor(x, k));
+		}
+	}
+
+	return tmp || x;
+}