vega-frontend-monorepo/apps/trading/components/app-loader/index.tsx

import type { ReactNode } from 'react';
import { useMemo } from 'react';
import { useEagerConnect } from '@vegaprotocol/wallet';
import { NetworkLoader } from '@vegaprotocol/environment';
import { Connectors } from '../../lib/vega-connectors';
import type { InMemoryCacheConfig } from '@apollo/client';

interface AppLoaderProps {
  children: ReactNode;
}

/**
 * Component to handle any app initialization, startup queries and other things
 * that must happen for it can be used
 */
export function AppLoader({ children }: AppLoaderProps) {
  // Get keys from vega wallet immediately
  useEagerConnect(Connectors);
  const cache: InMemoryCacheConfig = useMemo(
    () => ({
      typePolicies: {
        Account: {
          keyFields: false,
          fields: {
            balanceFormatted: {},
          },
        },
        Instrument: {
          keyFields: false,
        },
        TradableInstrument: {
          keyFields: ['instrument'],
        },
        Product: {
          keyFields: ['settlementAsset', ['id']],
        },
        MarketData: {
          keyFields: ['market', ['id']],
        },
        Node: {
          keyFields: false,
        },
        Withdrawal: {
          fields: {
            pendingOnForeignChain: {
              read: (isPending = false) => isPending,
            },
          },
        },
        ERC20: {
          keyFields: ['contractAddress'],
        },
        PositionUpdate: {
          keyFields: false,
        },
        AccountUpdate: {
          keyFields: false,
        },
        Party: {
          keyFields: false,
        },
        Fees: {
          keyFields: false,
        },
      },
    }),
    []
  );
  return <NetworkLoader cache={cache}>{children}</NetworkLoader>;
}