BaseOpts.md

@ethereumjs/common

---

@ethereumjs/common / BaseOpts

Interface: BaseOpts

Defined in: common/src/types.ts:94

Extended by

• CommonOpts
• GethConfigOpts

Properties

customCrypto?

optional customCrypto: CustomCrypto

Defined in: common/src/types.ts:138

This option can be used to replace the most common crypto primitives (keccak256 hashing e.g.) within the EthereumJS ecosystem libraries with alternative implementations (e.g. more performant WASM libraries).

Note: please be aware that this is adding new dependencies for your system setup to be used for sensitive/core parts of the functionality and a choice on the libraries to add should be handled with care and be made with eventual security implications considered.

---

eips?

optional eips: number[]

Defined in: common/src/types.ts:109

Selected EIPs which can be activated, please use an array for instantiation (e.g. eips: [ 2537, ])

Currently supported:

• EIP-2537 - BLS12-381 precompiles

---

hardfork?

optional hardfork: string

Defined in: common/src/types.ts:100

String identifier ('byzantium') for hardfork or Hardfork enum.

Default: Hardfork.London

---

params?

optional params: ParamsDict

Defined in: common/src/types.ts:127

Optionally pass in an EIP params dictionary, see one of the EthereumJS library params.ts files for an example (e.g. tx, evm). By default parameters are set by the respective library, so this is only relevant if you want to use EthereumJS libraries with a custom parameter set.

Example Format:

{
  1559: {
    initialBaseFee: 1000000000,
  }
}