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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

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

mode

readonly mode: "fork" | "proxy" | "normal"

The mode the current client is running in fork mode will fetch and cache all state from the block forked from the provided URL proxy mode will fetch all state from the latest block of the provided proxy URL normal mode will not fetch any state and will only run the EVM in memory

Source

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

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