Nexus Provider

1"use client";
2import {
3  type ChainBalance,
4  createNexusClient,
5  type EthereumProvider,
6  type NexusClient,
7  type NexusNetwork,
8  type OnAllowanceHookData,
9  type OnIntentHookData,
10  type OnSwapIntentHookData,
11  type SupportedChainsAndTokensResult,
12  type TokenBalance,
13} from "@avail-project/nexus-core";
14import { getCoinbaseRates } from "@avail-project/nexus-core/utils";
15 
16export type UserAsset = TokenBalance & {
17  breakdown: (ChainBalance & {
18    balance: string;
19    balanceInFiat: number;
20    chain: ChainBalance["chain"];
21    contractAddress: string;
22    decimals: number;
23    symbol: string;
24  })[];
25  balanceInFiat?: number;
26};
27 
28type SupportedChainsResult = SupportedChainsAndTokensResult;
29 
30type BalanceFetchTiming = {
31  runId: number;
32  source: string;
33  startTimeMs: number;
34  walletAddress: string | null;
35};
36 
37import {
38  createContext,
39  type RefObject,
40  useCallback,
41  useContext,
42  useEffect,
43  useMemo,
44  useRef,
45  useState,
46} from "react";
47import { useAccountEffect } from "wagmi";
48import {
49  isSwapSupportedBySdkChainList,
50  type SdkChainListWithSwapSupport,
51} from "../common/utils/constant";
52import {
53  buildUsdPeggedSymbolSet,
54  DEFAULT_USD_PEGGED_TOKEN_SYMBOLS,
55  fetchCoinbaseUsdRate,
56  fetchCoinGeckoUsdRate,
57  getCoinbaseSymbolCandidates,
58  normalizeTokenSymbol,
59  resolveBaseSymbol,
60  toFinitePositiveNumber,
61  TOKEN_PRICE_PEGS,
62  TokenPricingError,
63  USD_PEGGED_FALLBACK_RATE,
64} from "../common/utils/token-pricing";
65 
66interface NexusContextType {
67  allowance: RefObject<OnAllowanceHookData | null>;
68  attachEventHooks: () => void;
69  bridgableBalance: UserAsset[] | null;
70  bridgableBalanceLoading: boolean;
71  deinitializeNexus: () => Promise<void>;
72  exchangeRate: Record<string, number> | null;
73  fetchBridgableBalance: () => Promise<void>;
74  fetchSwapBalance: () => Promise<UserAsset[] | null>;
75  getFiatValue: (amount: number, token: string) => number;
76  handleInit: (
77    provider: EthereumProvider,
78    accountAddress?: string,
79  ) => Promise<void>;
80  initializeNexus: (
81    provider: EthereumProvider,
82    accountAddress?: string,
83  ) => Promise<void>;
84  intent: RefObject<OnIntentHookData | null>;
85  loading: boolean;
86  network?: NexusNetwork;
87  nexusSDK: NexusClient | null;
88  resolveTokenUsdRate: (tokenSymbol: string) => Promise<number | null>;
89  setAllowance: (data: OnAllowanceHookData | null) => void;
90  setIntent: (data: OnIntentHookData | null) => void;
91  supportedChainsAndTokens: SupportedChainsAndTokensResult | null;
92// … truncated