MemoryClient

MemoryClient: TevmClient & object

A local EVM instance running in JavaScript. Similar to Anvil in your browser/node/bun environments Implements the TevmClient interface with an in memory EVM instance.

See

• TevmClient
• WrappedEvm for an remote client

Example

import { createMemoryClient } from "tevm"
import { createPublicClient, http } from "viem"
import { MyERC721 } from './MyERC721.sol'

const tevm = createMemoryClient({
  fork: {
    url: "https://mainnet.optimism.io",
  },
})

const address = '0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045',

await tevm.contract(
  MyERC721.write.mint({
    caller: address,
  }),
)

const balance = await tevm.runContractCall(
 MyERC721.read.balanceOf({
 caller: address,
 }),
 )
 console.log(balance) // 1n

Type declaration

_evm

readonly _evm: WrappedEvm

Internal instance of the EVM. Can be used for lower level operations but is not guaranteed to stay stable between versions

_vm

readonly _vm: VM

Internal instance of the VM. Can be used for lower level operations but is not guaranteed to stay stable between versions

forkUrl

readonly forkUrl?: string

Fork url if the EVM is forked

Source

packages/memory-client/src/MemoryClient.ts:39

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