Can't pass helpers to Pug engine

[max-block]

Here is a test file:

const Koa = require("koa")
const views = require("koa-views")

const app = new Koa()

app.use(
  views(__dirname + "/views", {
    extension: "pug",
    options: {
      helpers: {
        uppercase: str => str.toUpperCase()
      }
    }
  })
)

app.use(ctx => ctx.render("index", { name: "Name1" }))

app.listen(3000)

Template file views/index.pug is simple: h1= uppercase(name)

But Pug doesn't see this template:

$ DEBUG=koa-views node index
  koa-views render `index.pug` with {"name":"Name1","helpers":{},"partials":{}} +0ms

  TypeError: /Users/max7z/projects/test/t24__test__koa-views_pug/views/index.pug:1
    > 1| h1= uppercase(name)
      2|

  uppercase is not a function
      at eval (eval at wrap (/Users/max7z/projects/test/t24__test__koa-views_pug/node_modules/pug-runtime/wrap.js:6:10), <anonymous>:6:57)

[int64ago]

helpers is not the option of pug but handlebars

[max-block]

Is it possible to use helpers for pug with koa-views module?

It's possible to do it with koa-pug module, here is code sample:

import * as helpers from "./helpers"

const pug = new Pug({
    app,
    viewPath: path.join(__dirname, "../templates"),
    helperPath: [helpers],
    noCache: !IS_PRODUCTION
  })