Make fields of the FilledNewOrderRequest as readonly;

Fix typos

src/atomex/atomex.ts

@@ -83,13 +83,12 @@ export class Atomex implements AtomexService {
       throw new Error('Swap tracking is not implemented yet');
 
     const swapPreview = newSwapRequestOrSwapId.swapPreview;
-    if (!swapPreview.errors.length)
+    if (swapPreview.errors.length)
       throw new Error('Swap preview has errors');
 
     const fromAddress = swapPreview.to.address;
     if (!fromAddress)
-      throw new Error('Swap preview has not the "from" address');
-
+      throw new Error('Swap preview doesn\'t have the "from" address');
 
     const quoteCurrencyId = symbolsHelper.getQuoteBaseCurrenciesBySymbol(swapPreview.symbol)[0];
     const directionName: 'from' | 'to' = quoteCurrencyId === swapPreview.from.currencyId ? 'from' : 'to';

src/atomex/models/swapPreview.ts

@@ -5,8 +5,8 @@ import type { OrderType } from '../../exchange/index';
 
 export interface SwapPreview {
   readonly type: OrderType;
-  readonly from: SwapPreviewData;
-  readonly to: SwapPreviewData;
+  readonly from: SwapPreviewDirectionData;
+  readonly to: SwapPreviewDirectionData;
   readonly symbol: string;
   readonly side: Side;
   readonly fees: {
@@ -17,7 +17,7 @@ export interface SwapPreview {
   readonly warnings: readonly SwapPreviewWarning[];
 }
 
-interface SwapPreviewData {
+interface SwapPreviewDirectionData {
   readonly address?: string;
   readonly currencyId: Currency['id'];
   readonly actual: SwapPreviewCurrencyData;

src/exchange/models/newOrderRequest.ts

@@ -23,9 +23,9 @@ export interface NewOrderRequest {
 }
 
 export interface FilledNewOrderRequest {
-  clientOrderId: string;
-  orderBody: OrderBody | OrderPreview;
-  requisites: Mutable<SwapParticipantRequisites>;
-  proofsOfFunds: ProofOfFunds[];
+  readonly clientOrderId: string;
+  readonly orderBody: OrderBody | OrderPreview;
+  readonly requisites: Mutable<SwapParticipantRequisites>;
+  readonly proofsOfFunds: ProofOfFunds[];
 }