Add assert decorator functions.

config-serializer/config-items/SwitchKeymapAction.ts

@@ -1,3 +1,43 @@
+function assertUInt8(target: any, key: string) {
+    let val = this[key];
+    if (delete this[key]) {
+        Object.defineProperty(target, key, {
+            get: function () {
+                return val;
+            },
+            set: function (newVal) {
+                if (newVal < 0 || newVal > 255) {
+                    throw `Invalid ${target.constructor.name}.${key}: ${newVal} is not uint8`;
+                }
+                val = newVal;
+            },
+            enumerable: true,
+            configurable: true
+        });
+    }
+}
+
+function assertEnum<E>(enumerated: E) {
+    return function(target: any, key: string) {
+        let val = this[key];
+        if (delete this[key]) {
+            Object.defineProperty(target, key, {
+                get: function () {
+                    return val;
+                },
+                set: function (newVal) {
+                    if (enumerated[newVal] === undefined) {
+                        throw `Invalid ${target.constructor.name}.${key}: ${newVal} is not enum`;
+                    }
+                    val = newVal;
+                },
+                enumerable: true,
+                configurable: true
+            });
+        }
+    }
+}
+
 enum Layer {
     mod,
     fn,
@@ -11,8 +51,9 @@ class SwitchLayerAction extends KeyAction implements Serializable<SwitchLayerAct
 
     isLayerToggleable: boolean;
 
-    private _layer: Layer;
-
+    @assertEnum(Layer)
+    private layer: Layer;
+/*
     get layer(): number {
         return this._layer;
     }
@@ -23,14 +64,14 @@ class SwitchLayerAction extends KeyAction implements Serializable<SwitchLayerAct
         }
         this._layer = value;
     }
-
+*/
     getToggleFlag() {
         return this.isLayerToggleable ? SwitchLayerAction.toggleFlag : 0;
     }
 
     fromJsObject(jsObject: any): SwitchLayerAction {
         this.assertKeyActionType(jsObject, SwitchLayerAction.keyActionTypeString, 'SwitchLayerAction');
-        this.layer = jsObject.keymapId;
+        this.layer = jsObject.layerId;
         this.isLayerToggleable = jsObject.toggle;
         return this;
     }