creating middleware with context type as param

import type { MiddlewareResult } from '@trpc/server'
import { initTRPC } from '@trpc/server'

import type { Context } from '../context'

type Action<C, R> = (opts: {
  ctx: C
  result: MiddlewareResult<R>
}) => unknown | Promise<unknown>

export function post<C, R>(action: Action<C, R>) {
  const t = initTRPC.context<Pick<Context, 'get'>>().create()

  return t.procedure
    .use(async ({ ctx, next }) => {
      const result = await next()

      action({ ctx, result })

      return result
    })
}