quickswap-smart-order-router/build/module/providers/on-chain-gas-price-provider.js

QuickSwap Smart Order Router

import { ChainId } from '../util/chains';
import { IGasPriceProvider } from './gas-price-provider';
const DEFAULT_EIP_1559_SUPPORTED_CHAINS = [
    ChainId.MAINNET,
    ChainId.RINKEBY,
    ChainId.ROPSTEN,
    ChainId.GÖRLI,
    ChainId.POLYGON,
    ChainId.POLYGON_MUMBAI,
    // infura endpoint having difficulty w/ eip-1559 on kovan
    // ChainId.KOVAN,
];
/**
 * Gets gas prices on chain. If the chain supports EIP-1559 and has the feeHistory API,
 * uses the EIP1559 provider. Otherwise it will use a legacy provider that uses eth_gasPrice
 *
 * @export
 * @class OnChainGasPriceProvider
 */
export class OnChainGasPriceProvider extends IGasPriceProvider {
    constructor(chainId, eip1559GasPriceProvider, legacyGasPriceProvider, eipChains = DEFAULT_EIP_1559_SUPPORTED_CHAINS) {
        super();
        this.chainId = chainId;
        this.eip1559GasPriceProvider = eip1559GasPriceProvider;
        this.legacyGasPriceProvider = legacyGasPriceProvider;
        this.eipChains = eipChains;
    }
    async getGasPrice() {
        if (this.eipChains.includes(this.chainId)) {
            return this.eip1559GasPriceProvider.getGasPrice();
        }
        return this.legacyGasPriceProvider.getGasPrice();
    }
}
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