refactor(viewer.js): Add errorinterceptor argument to propagate error to the top level app

src/customError.js

@@ -0,0 +1,15 @@
+const errorTypes = {
+  VISUALIZATION: 'Visualization',
+  ENCODINGANDDECODING: 'EncodingDecoding'
+}
+
+class CustomError extends Error {
+  constructor (type, message) {
+    super()
+    this.message = message
+    this.stack = new Error().stack
+    this.type = type
+  }
+}
+
+export { errorTypes, CustomError }