snapshot 
Snapshot the state of the blockchain at the current block.
Usage 
ts
import { testClient } from './client'
const id = await testClient.snapshot() 
ts
import { createTestClient, http } from 'viem'
import { foundry } from 'viem/chains'
export const testClient = createTestClient({
  chain: foundry,
  mode: 'anvil',
  transport: http(), 
})
Returns 
ID of the snapshot that was created.