fix(xcm-router): Add missing methods to Router builder

apps/playground/src/components/RouterTransferForm.tsx

@@ -47,6 +47,7 @@ export type FormValues = {
   useApi: boolean;
   evmSigner?: Signer;
   evmInjectorAddress?: string;
+  assetHubAddress?: string;
   ethSigner?: ethers.Signer;
 };
 

apps/playground/src/routes/RouterTransferPage.tsx

@@ -12,11 +12,11 @@ import {
   Center,
 } from "@mantine/core";
 import {
-  transfer,
   TransactionType,
   TTxProgressInfo,
   TExchangeNode,
   TransactionStatus,
+  RouterBuilder,
 } from "@paraspell/xcm-router";
 import { web3FromAddress } from "@polkadot/extension-dapp";
 import { useDisclosure, useScrollIntoView } from "@mantine/hooks";
@@ -76,15 +76,39 @@ const RouterTransferPage = () => {
     injectorAddress: string,
     signer: Signer
   ) => {
-    const { transactionType } = formValues;
-    await transfer({
-      ...formValues,
-      injectorAddress: injectorAddress,
-      signer: signer,
-      type: TransactionType[transactionType],
-      exchange: exchange ?? undefined,
-      onStatusChange,
-    });
+    const {
+      from,
+      to,
+      currencyFrom,
+      currencyTo,
+      amount,
+      recipientAddress,
+      evmInjectorAddress,
+      assetHubAddress,
+      slippagePct,
+      evmSigner,
+      ethSigner,
+      transactionType,
+    } = formValues;
+
+    await RouterBuilder()
+      .from(from)
+      .to(to)
+      .exchange(exchange)
+      .currencyFrom(currencyFrom)
+      .currencyTo(currencyTo)
+      .amount(amount)
+      .injectorAddress(injectorAddress)
+      .recipientAddress(recipientAddress)
+      .evmInjectorAddress(evmInjectorAddress)
+      .assetHubAddress(assetHubAddress)
+      .signer(signer)
+      .ethSigner(ethSigner)
+      .evmSigner(evmSigner)
+      .slippagePct(slippagePct)
+      .transactionType(TransactionType[transactionType])
+      .onStatusChange(onStatusChange)
+      .build();
   };
 
   const submitUsingApi = async (

packages/xcm-router/src/RouterBuilder.test.ts

@@ -1,8 +1,8 @@
 import { describe, expect, it, vi, beforeEach, type MockInstance } from 'vitest';
 import * as index from './index';
-import RouterBuilder from './RouterBuilder';
+import { RouterBuilder } from './RouterBuilder';
 import { type Signer } from '@polkadot/api/types';
-import { Signer as EthSigner } from 'ethers';
+import { type Signer as EthSigner } from 'ethers';
 
 export const transferParams: index.TTransferOptions = {
   from: 'Astar',
@@ -93,9 +93,9 @@ describe('Builder', () => {
       .recipientAddress(recipientAddress)
       .signer(signer)
       .slippagePct(slippagePct)
-      .onStatusChange(onStatusChange)
       .assetHubAddress(assetHubAddress)
       .ethSigner(ethSigner)
+      .onStatusChange(onStatusChange)
       .build();
 
     expect(spy).toHaveBeenCalledWith({
@@ -106,6 +106,25 @@ describe('Builder', () => {
     });
   });
 
+  it('should construct a transfer using RouterBuilder with automatic selection', async () => {
+    const onStatusChange = vi.fn();
+
+    await RouterBuilder()
+      .from(from)
+      .to(to)
+      .currencyFrom(currencyFrom)
+      .currencyTo(currencyTo)
+      .amount(amount)
+      .injectorAddress(injectorAddress)
+      .recipientAddress(recipientAddress)
+      .signer(signer)
+      .slippagePct(slippagePct)
+      .onStatusChange(onStatusChange)
+      .build();
+
+    expect(spy).toHaveBeenCalledWith({ ...transferParams, onStatusChange, exchange: undefined });
+  });
+
   it('should fail to construct a transfer using RouterBuilder when missing some params', async () => {
     await expect(async () => {
       await RouterBuilder()

packages/xcm-router/src/RouterBuilder.ts

@@ -7,7 +7,7 @@ import {
   type TTransferOptions,
 } from '.';
 import { type TNodeWithRelayChains } from '@paraspell/sdk';
-import { Signer as EthSigner } from 'ethers';
+import { type Signer as EthSigner } from 'ethers';
 
 export interface TRouterBuilderOptions {
   from?: TNodeWithRelayChains;
@@ -21,9 +21,10 @@ export interface TRouterBuilderOptions {
   recipientAddress?: string;
   assetHubAddress?: string;
   slippagePct?: string;
+  ethSigner?: EthSigner;
   signer?: Signer;
   evmSigner?: Signer;
-  ethSigner?: EthSigner;
+  transactionType?: TransactionType;
   onStatusChange?: (info: TTxProgressInfo) => void;
 }
 
@@ -39,7 +40,7 @@ export class RouterBuilderObject {
     return this;
   }
 
-  exchange(node: TExchangeNode): this {
+  exchange(node: TExchangeNode | undefined): this {
     this._routerBuilderOptions.exchange = node;
     return this;
   }
@@ -74,7 +75,7 @@ export class RouterBuilderObject {
     return this;
   }
 
-  assetHubAddress(assetHubAddress: string): this {
+  assetHubAddress(assetHubAddress: string | undefined): this {
     this._routerBuilderOptions.assetHubAddress = assetHubAddress;
     return this;
   }
@@ -84,18 +85,18 @@ export class RouterBuilderObject {
     return this;
   }
 
-  evmInjectorAddress(evmInjectorAddress: string): this {
-    this._routerBuilderOptions.evmInjectorAddress = evmInjectorAddress;
+  ethSigner(ethSigner: EthSigner | undefined): this {
+    this._routerBuilderOptions.ethSigner = ethSigner;
     return this;
   }
 
-  evmSigner(evmSigner: Signer): this {
-    this._routerBuilderOptions.evmSigner = evmSigner;
+  evmInjectorAddress(evmInjectorAddress: string | undefined): this {
+    this._routerBuilderOptions.evmInjectorAddress = evmInjectorAddress;
     return this;
   }
 
-  ethSigner(ethSigner: EthSigner): this {
-    this._routerBuilderOptions.ethSigner = ethSigner;
+  evmSigner(evmSigner: Signer | undefined): this {
+    this._routerBuilderOptions.evmSigner = evmSigner;
     return this;
   }
 
@@ -104,6 +105,11 @@ export class RouterBuilderObject {
     return this;
   }
 
+  transactionType(transactionType: TransactionType): this {
+    this._routerBuilderOptions.transactionType = transactionType;
+    return this;
+  }
+
   onStatusChange(callback: (status: TTxProgressInfo) => void): this {
     this._routerBuilderOptions.onStatusChange = callback;
     return this;
@@ -112,7 +118,6 @@ export class RouterBuilderObject {
   async build(): Promise<void> {
     const requiredParams: Array<keyof TRouterBuilderOptions> = [
       'from',
-      'exchange',
       'to',
       'currencyFrom',
       'currencyTo',
@@ -131,11 +136,9 @@ export class RouterBuilderObject {
 
     await transfer({
       ...(this._routerBuilderOptions as TTransferOptions),
-      type: TransactionType.FULL_TRANSFER,
+      type: this._routerBuilderOptions.transactionType ?? TransactionType.FULL_TRANSFER,
     });
   }
 }
 
-const RouterBuilder = (): RouterBuilderObject => new RouterBuilderObject();
-
-export default RouterBuilder;
+export const RouterBuilder = (): RouterBuilderObject => new RouterBuilderObject();

packages/xcm-router/src/index.ts

@@ -2,3 +2,4 @@ export * from './transfer/transfer';
 export * from './transfer/buildTransferExtrinsics';
 export * from './types';
 export * from './consts/consts';
+export * from './RouterBuilder';

packages/xcm-router/src/transfer/transfer.ts

@@ -28,6 +28,7 @@ export const transfer = async (options: TTransferOptions): Promise<void> => {
     assetHubAddress,
     type,
   } = options;
+
   if (evmSigner !== undefined && evmInjectorAddress === undefined) {
     throw new Error('evmInjectorAddress is required when evmSigner is provided');
   }

packages/xcm-router/src/transfer/transferToEthereum.test.ts

@@ -55,7 +55,7 @@ describe('transferToEthereum', () => {
       type: TransactionType.TO_ETH,
       status: TransactionStatus.IN_PROGRESS,
     });
-    expect(submitTransferToDestination).toHaveBeenCalledWith(mockApi, options, amountOut);
+    expect(submitTransferToDestination).toHaveBeenCalledWith(mockApi, options, amountOut, true);
     expect(maybeUpdateTransferStatus).toHaveBeenCalledWith(options.onStatusChange, {
       type: TransactionType.TO_ETH,
       status: TransactionStatus.SUCCESS,

packages/xcm-router/src/transfer/transferToEthereum.ts

@@ -10,7 +10,7 @@ export const transferToEthereum = async (options: TTransferOptionsModified, amou
     status: TransactionStatus.IN_PROGRESS,
   });
   const assetHubApi = await createApiInstanceForNode('AssetHubPolkadot');
-  await submitTransferToDestination(assetHubApi, options, amountOut);
+  await submitTransferToDestination(assetHubApi, options, amountOut, true);
   maybeUpdateTransferStatus(onStatusChange, {
     type: TransactionType.TO_ETH,
     status: TransactionStatus.SUCCESS,

packages/xcm-router/src/transfer/utils.ts

@@ -29,6 +29,7 @@ export const buildFromExchangeExtrinsic = async (
   api: ApiPromise,
   { to, exchange, currencyTo, recipientAddress: address }: TCommonTransferOptionsModified,
   amountOut: string,
+  isToEth = false,
 ): Promise<Extrinsic> => {
   const builder = Builder(api);
   if (to === 'Polkadot' || to === 'Kusama') {
@@ -37,7 +38,7 @@ export const buildFromExchangeExtrinsic = async (
 
   return await builder
     .from(exchange)
-    .to(to === 'Ethereum' ? 'AssetHubPolkadot' : to)
+    .to(to === 'Ethereum' && !isToEth ? 'AssetHubPolkadot' : to)
     .currency({
       symbol: currencyTo,
     })
@@ -75,10 +76,11 @@ export const submitTransferToDestination = async (
   api: ApiPromise,
   options: TTransferOptionsModified,
   amountOut: string,
+  isToEth = false,
 ): Promise<string> => {
   const { to, currencyTo, signer, injectorAddress } = options;
   validateRelayChainCurrency(to, currencyTo);
-  const tx = await buildFromExchangeExtrinsic(api, options, amountOut);
+  const tx = await buildFromExchangeExtrinsic(api, options, amountOut, isToEth);
   return await submitTransaction(api, tx, signer, injectorAddress);
 };