Add setValue to InternalAnimatedValue (#532)

- fix #481
- add errors for better hints when types are passed incorrectly

src/core/AnimatedParam.js

@@ -18,11 +18,17 @@ export class AnimatedParam extends AnimatedNode {
   }
 
   setValue(value) {
+    if (!this.argsStack.length) throw new Error(`param: setValue(${value}) failed because argsStack is empty`);
     const top = this.argsStack[this.argsStack.length - 1];
-    top.setValue(value);
+    if (top.setValue) {
+      top.setValue(value);
+    } else {
+      throw new Error(`param: setValue(${value}) failed because the top element has no known method for updating it's current value.`)
+    }
   }
-
+  
   __onEvaluate() {
+    if (!this.argsStack.length) throw new Error(`param: __onEvaluate() failed because argsStack is empty`);
     const top = this.argsStack[this.argsStack.length - 1];
     return val(top);
   }

src/core/AnimatedSet.js

@@ -28,7 +28,7 @@ class AnimatedSet extends AnimatedNode {
 
   __onEvaluate() {
     const newValue = val(this._value);
-    this._what._updateValue(newValue);
+    this._what.setValue(newValue);
     return newValue;
   }
 }

src/core/AnimatedValue.js

@@ -3,7 +3,7 @@ import interpolate from '../derived/interpolate';
 import InternalAnimatedValue from './InternalAnimatedValue';
 import { Platform } from 'react-native';
 import { evaluateOnce } from '../derived/evaluateOnce';
-import  ReanimatedModule from '../ReanimatedModule';
+import ReanimatedModule from '../ReanimatedModule';
 
 // Animated value wrapped with extra methods for omit cycle of dependencies
 export default class AnimatedValue extends InternalAnimatedValue {

src/core/InternalAnimatedValue.js

@@ -72,6 +72,12 @@ export default class InternalAnimatedValue extends AnimatedNode {
     return this._value;
   }
 
+  // AnimatedValue will override this method to modify the value of a native node.
+  setValue(value) {
+    this.__detachAnimation(this._animation);
+    this._updateValue(value);
+  }
+
   _updateValue(value) {
     this._value = value;
     this.__forceUpdateCache(value);