Прогнал линтером для автоматических доделок, но оставлять его не стал - слишком много ошибок

src/app/data.ts

@@ -1,33 +1,32 @@
 import rfdc from 'rfdc'
 
-interface ValuesObject {
-    [key: string]: any
-}
+type ValuesObject = Record<string, any>
 
 export abstract class Data {
+    [key: string]: any
+
     static assign(vo: Data, values: ValuesObject): Data {
-        for (let key of Object.getOwnPropertyNames(values)) {
+        for (const key of Object.getOwnPropertyNames(values)) {
             vo[key] = values[key]
         }
+
         return vo
     }
 
-    [key: string]: any
-
     set(key: string, value: any) {
         this[key] = value
     }
 
-    fromObject(obj: ValuesObject): void {
-        for (let key of Object.getOwnPropertyNames(obj)) {
+    fromObject(object: ValuesObject): void {
+        for (const key of Object.getOwnPropertyNames(object)) {
             if (key === '_id') continue
-            this[key] = obj[key]
+            this[key] = object[key]
         }
     }
 
-    toObject(exclude: string[] = []): object {
-        const obj = {} as ValuesObject
-        for (let key of Object.getOwnPropertyNames(this)) {
+    toObject(exclude: string[] = []): Record<string, any> {
+        const object = {} as ValuesObject
+        for (const key of Object.getOwnPropertyNames(this)) {
             if (key.startsWith('__')) {
                 continue
             }
@@ -36,14 +35,15 @@ export abstract class Data {
 
             const type = typeof this[key]
             if (type === 'object') {
-                obj[key] = rfdc()(this[key])
-            } else if (['function', 'undefined'].indexOf(type) >= 0) {
+                object[key] = rfdc()(this[key])
+            } else if (['function', 'undefined'].includes(type)) {
                 // ...
             } else {
-                obj[key] = this[key]
+                object[key] = this[key]
             }
         }
-        return obj
+
+        return object
     }
 
     abstract uniqKey(): string