feat(api): support quotes to amount

src/services/api.ts

@@ -11,7 +11,7 @@ import {
   type GasRecommendationResponse,
   type GetStatusRequest,
   type LiFiStep,
-  type QuoteRequest,
+  type QuoteRequest as QuoteRequestFromAmount,
   type RelayRequest,
   type RelayResponse,
   type RelayResponseData,
@@ -42,6 +42,13 @@ import { request } from '../request.js'
 import { isRoutesRequest, isStep } from '../typeguards.js'
 import { withDedupe } from '../utils/withDedupe.js'
 
+type QuoteRequest =
+  | QuoteRequestFromAmount
+  | (Omit<QuoteRequestFromAmount, 'fromAmount'> & {
+      toAmount: string
+      fromAmount?: never
+    })
+
 /**
  * Get a quote for a token transfer
  * @param params - The configuration of the requested quote
@@ -57,7 +64,6 @@ export const getQuote = async (
     'fromChain',
     'fromToken',
     'fromAddress',
-    'fromAmount',
     'toChain',
     'toToken',
   ]
@@ -70,6 +76,29 @@ export const getQuote = async (
       )
     }
   }
+  if (
+    (!('fromAmount' in params) || !params.fromAmount) &&
+    (!('toAmount' in params) || !params.toAmount)
+  ) {
+    throw new SDKError(
+      new ValidationError(
+        'Required parameter "fromAmount" or "toAmount" is missing.'
+      )
+    )
+  }
+  if (
+    'fromAmount' in params &&
+    'toAmount' in params &&
+    params.fromAmount &&
+    // @ts-expect-error type-agnostic runtime check
+    params.toAmount
+  ) {
+    throw new SDKError(
+      new ValidationError(
+        'Cannot provide both "fromAmount" and "toAmount" parameters.'
+      )
+    )
+  }
   const _config = config.get()
   // apply defaults
   params.integrator ??= _config.integrator
@@ -91,7 +120,7 @@ export const getQuote = async (
   }
 
   return await request<LiFiStep>(
-    `${_config.apiUrl}/quote?${new URLSearchParams(
+    `${_config.apiUrl}/${params.fromAmount ? 'quote' : 'quote/toAmount'}?${new URLSearchParams(
       params as unknown as Record<string, string>
     )}`,
     {
@@ -259,10 +288,10 @@ export const getStatus = async (
  * @returns Relayer quote for a token transfer
  */
 export const getRelayerQuote = async (
-  params: QuoteRequest,
+  params: QuoteRequestFromAmount,
   options?: RequestOptions
 ): Promise<LiFiStep> => {
-  const requiredParameters: Array<keyof QuoteRequest> = [
+  const requiredParameters: Array<keyof QuoteRequestFromAmount> = [
     'fromChain',
     'fromToken',
     'fromAddress',

src/services/api.unit.spec.ts

@@ -195,6 +195,7 @@ describe('ApiService', () => {
     const fromAmount = '1000'
     const toChain = ChainId.POL
     const toToken = 'MATIC'
+    const toAmount = '1000'
 
     describe('user input is invalid', () => {
       it('throw an error', async () => {
@@ -254,7 +255,28 @@ describe('ApiService', () => {
           })
         ).rejects.toThrowError(
           new SDKError(
-            new ValidationError('Required parameter "fromAmount" is missing.')
+            new ValidationError(
+              'Required parameter "fromAmount" or "toAmount" is missing.'
+            )
+          )
+        )
+
+        await expect(
+          ApiService.getQuote({
+            fromChain,
+            fromToken,
+            fromAddress,
+            fromAmount,
+            toChain,
+            toToken,
+            // @ts-expect-error test runtime check
+            toAmount,
+          })
+        ).rejects.toThrowError(
+          new SDKError(
+            new ValidationError(
+              'Cannot provide both "fromAmount" and "toAmount" parameters.'
+            )
           )
         )