ViemTevmExtension

ViemTevmExtension: () => ViemTevmClientDecorator

Deprecated

in favor of the viem transport

This extension is highly experimental and should not be used in production.

Creates a decorator to a viem wallet client that adds the writeContractOptimistic method to the tevm property. This enables viem to optimistically update the tevm state before the transaction is mined.

Returns

ViemTevmClientDecorator

Example

import { tevmViemExtensionOptimistic } from 'tevmViemExtensionOptimistic'
import { walletClient } from './walletClient.js'

const client = walletClient.extend(tevmViemExtensionOptimistic())

for (const result of client.tevm.writeContractOptimistic({
  from: '0x...',
  to: '0x...',
  abi: [...],
  functionName: 'transferFrom',
  args: ['0x...', '0x...', '1000000000000000000'],
})) {
  if (result.tag === 'OPTIMISTIC_RESULT') {
    expect(result).toEqual({
      data: mockRequestResponse as any,
      success: true,
      tag: 'OPTIMISTIC_RESULT',
    })
    expect((client.request as jest.Mock).mock.lastCall[0]).toEqual({
      method: 'tevm_contract',
params: params,
      jsonrpc: '2.0',
    })
    expect((client.writeContract as jest.Mock).mock.lastCall[0]).toEqual({
      abi: params.abi,
      functionName: params.functionName,
      args: params.args,
      caller: params.caller,
      address: params.address,
      account: params.account,
      chain: params.chain,
    })
  } else if (result.tag === 'HASH') {
    expect(result).toEqual({
      data: mockWriteContractResponse,
      success: true,
      tag: 'HASH',
    })
  } else if (result.tag === 'RECEIPT') {
    expect(result).toEqual({
      data: mockTxReciept,
      success: true,
      tag: 'RECEIPT',
    })
    expect(mockWaitForTransactionReceipt.mock.lastCall[0]).toEqual(client)
    expect(mockWaitForTransactionReceipt.mock.lastCall[1]).toEqual({
      hash: mockWriteContractResponse,
    })
  }
}

## Defined in

[extensions/viem/src/ViemTevmExtension.ts:63](https://github.com/evmts/tevm-monorepo/blob/main/extensions/viem/src/ViemTevmExtension.ts#L63)