@ethereumjs/common/dist/esm/constructors.js

Resources common to all Ethereum implementations

import { Common, parseGethGenesis } from "./index.js";
/**
 * Creates a {@link Common} object for a custom chain, based on a standard one.
 *
 * It uses all the {@link Chain} parameters from the {@link baseChain} option except the ones overridden
 * in a provided {@link chainParamsOrName} dictionary. Some usage example:
 *
 * ```javascript
 * import { createCustomCommon, Mainnet } from '@ethereumjs/common'
 *
 * createCustomCommon({chainId: 123}, Mainnet)
 * ```
 *
 * @param partialConfig Custom parameter dict
 * @param baseChain `ChainConfig` chain configuration taken as a base chain, e.g. `Mainnet` (exported at root level)
 * @param opts Custom chain options to set various {@link BaseOpts}
 */
export function createCustomCommon(partialConfig, baseChain, opts = {}) {
    return new Common({
        chain: {
            ...baseChain,
            ...partialConfig,
        },
        ...opts,
    });
}
/**
 * Static method to load and set common from a geth genesis object
 * @param genesisJSON GethGenesis object
 * @returns a new {@link Common} object
 */
export function createCommonFromGethGenesis(genesisJSON, { chain, eips, genesisHash, hardfork, params, customCrypto }) {
    const genesisParams = parseGethGenesis(genesisJSON, chain);
    const common = new Common({
        chain: {
            ...genesisParams,
            name: genesisParams.name ?? 'Custom chain',
        }, // Typecasting because of `string` -> `PrefixedHexString` mismatches
        eips,
        params,
        hardfork: hardfork ?? genesisParams.hardfork,
        customCrypto,
    });
    if (genesisHash !== undefined) {
        common.setForkHashes(genesisHash);
    }
    return common;
}
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