Fix lint errors

Author: nazarhussain

packages/simpleserialize.com/src/components/Output.tsx

@@ -61,8 +61,8 @@ export default class Output<T> extends React.Component<Props<T>, State> {
     const {error, serialized, deserialized, hashTreeRoot, serializeModeOn, sszType} = this.props;
     const {showError, outputType} = this.state;
 
-    let serializedStr: string = "";
-    let hashTreeRootStr: string = "";
+    let serializedStr = "";
+    let hashTreeRootStr = "";
     let deserializedStr = "";
     if (serializeModeOn) {
       const serializedOutput = serializeOutputTypes[outputType];

packages/simpleserialize.com/src/components/Serialize.tsx

@@ -62,7 +62,7 @@ export default class Serialize extends React.Component<Props, State> {
   }
 
   async process(forkName: ForkName, name: string, input: unknown, type: Type<unknown>): Promise<void> {
-    let error: string = "";
+    let error = "";
     if (this.props.serializeModeOn) {
       this.setOverlay(true, "Serializing...");
       this.serializationWorkerThread