Type instantiation is excessively deep and possibly infinite on Typescript when extending Viem

[gndelia]

Similar to

import { createPublicClient, http } from 'viem'
import { base } from 'viem/chains'
import { publicActionsL2 } from 'viem/op-stack'
 
const client = createPublicClient({
  chain: base,
  transport: http(),
}).extend(publicActionsL2()) 

I am trying to extend viem with a custom Viem action.

Here's the simplified version of my code - See typescript playground

This version is simplified because it is split into different files. The goal (for us) is to define custom functions in a file, then do something like

// Here functions such as getHeaderN are exported, and nothing else
import * as actions from "../actions/file"

const actionsToDecorator = function <
  TActions extends Actions<TTransport, TChain>,
  TTransport extends Transport = Transport,
  TChain extends Chain | undefined = Chain | undefined
>(
  actions: TActions
): (
  client: PublicClient<TTransport, TChain>
) => DecoratedActions<TActions, TTransport, TChain> {
  return function (
    client: PublicClient<TTransport, TChain>
  ): DecoratedActions<TActions, TTransport, TChain> {
    return Object.fromEntries(
      Object.keys(actions).map((action) => [
        action,
        (properties: Parameters<TActions[typeof action]>[1]) =>
          actions[action](client, properties),
      ])
    ) as DecoratedActions<TActions, TTransport, TChain>
  }
}

const decorated = <
  TTransport extends Transport = Transport,
  TChain extends Chain | undefined = Chain | undefined
>() => actionsToDecorator<typeof actions, TTransport, TChain>(actions)

const client = createPublicClient(parameters)
  .extend(decorated())

client.getHeaderN({ height: 1 })

While that seems to work (and I get the proper typing on getHeaderN), I also get Type instantiation is excessively deep and possibly infinite as you can check on the playground.

The idea is to use actionsToDecorator to import all the functions exported from the file, and whenever I need a new function to be added as an action, it just works by adding it into ../actions/file without having to do anything else

Any help or ideas? Thanks

[gndelia]

I was able to solve this - here is the updated playground. The trick was to use type Client which is exported from viem, instead of type PublicClient. It seems extend() expects the viem client instance is of type Client rather than PublicClient.