From 16d4e68a8a86482dff7a928d95d88679e06512de Mon Sep 17 00:00:00 2001
From: Timo Hocker <t-hocker@web.de>
Date: Thu, 7 May 2020 18:59:27 +0200
Subject: [PATCH] fix

---
 lib/Persistent.ts | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/lib/Persistent.ts b/lib/Persistent.ts
index 697d121..2340b02 100644
--- a/lib/Persistent.ts
+++ b/lib/Persistent.ts
@@ -1,8 +1,11 @@
 import { Assignable, Serializable } from './interfaces';
 
+type PersistentTypeString = 'string'|'number'|'boolean';
+type PersistentType = string|number|boolean;
+
 export abstract class Persistent implements Assignable, Serializable {
-  private _data: Record<string, unknown> = {};
-  protected readonly properties: Record<string, string> = {};
+  private _data: Record<string, PersistentType> = {};
+  protected readonly properties: Record<string, PersistentTypeString> = {};
 
   public assign (a: Assignable): void {
     this.assign_object (a.to_object ());
@@ -16,11 +19,11 @@ export abstract class Persistent implements Assignable, Serializable {
     for (const key of Object.keys (obj)) {
       const prop = this.properties[key];
       if (typeof prop !== 'undefined' && typeof obj[key] === prop)
-        this._data[key] = obj[key];
+        this._data[key] = obj[key] as PersistentType;
     }
   }
 
-  public to_object (): Record<string, unknown> {
+  public to_object (): Record<string, PersistentType> {
     return this._data;
   }
 
@@ -33,10 +36,10 @@ export abstract class Persistent implements Assignable, Serializable {
   public set (key: string, value: unknown): void {
     const prop = this.properties[key];
     if (typeof prop !== 'undefined' && typeof value === prop)
-      this._data[key] = value;
+      this._data[key] = value as PersistentType;
   }
 
-  public get (key: string): unknown {
+  public get (key: string): PersistentType {
     return this._data[key];
   }
 }