@nomicfoundation/hardhat-verify/dist/src/internal/chains.js

Hardhat plugin for verifying contracts

const chainIdCache = new WeakMap();
export async function getChainId(provider) {
    const cachedChainId = chainIdCache.get(provider);
    if (cachedChainId !== undefined) {
        return cachedChainId;
    }
    const chainId = Number(await provider.request({ method: "eth_chainId" }));
    chainIdCache.set(provider, chainId);
    return chainId;
}
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