added deepFreeze

coretool.js

@@ -10,6 +10,37 @@ module.exports = {
 
   sleep: (ms) => new Promise((resolve, reject) => setTimeout(resolve, ms)),
 
+  deepFreeze (obj) {
+    if (typeof obj !== 'object' || obj === null) {
+      return obj
+    }
+    Object.freeze(obj)
+    const propNames = Object.getOwnPropertyNames(obj)
+    propNames.forEach(prop => {
+      const propValue = obj[prop]
+      // for nested object
+      if (
+        propValue && typeof propValue === 'object' &&
+        !Object.isFrozen(propValue)
+      ) {
+        deepFreeze(propValue)
+      }
+      // for nested array
+      if (Array.isArray(propValue)) {
+        propValue.forEach(item => {
+          if (
+            item && typeof item === 'object' &&
+            !Object.isFrozen(item)
+          ) {
+            deepFreeze(item)
+          }
+        });
+        Object.freeze(propValue) // Freeze the array itself
+      }
+    })
+    return obj
+  },
+
   parse_json_anyway (value) {
     try {
       return JSON.parse(value)