Customize validator returns library internal error

Reproduction:

package.json

{
  "name": "w",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    "body-parser": "^1.18.3",
    "express": "^4.16.3",
    "express-validator": "^5.2.0"
  }
}

app.json

const {body, validationResult} = require('express-validator/check')
require('express')()
  .use(require('body-parser').json())
  .use(
    body('pwd').isLength({min: 8}, (pwd, {req}) => 'length must >= 8'),
    body('pwdCfrm').custom((pwdCfrm, {req}) => {
      if (pwdCfrm !== req.body.pwd)
        throw new Error('pwds do not match')
    }),
    (req, res) =>  res.end(JSON.stringify(validationResult(req).array()))
  ).listen(8000, () => console.log('app is listening'))

result when opening ‘localhost:8000’ in browser

[{"location":"body","param":"pwd","msg":"Invalid value"},{"location":"body","param":"pwdCfrm","msg":"Cannot read property 'then' of undefined"}]

while expected result is only 'length must >= 8' error

I also tried some workaround but thing does not work at all

[tranvansang]

I think always wrapping returned result by Promise.resolve() should work.

const func = x => {
if (x) throw new Error('x is true')
}
Promise.resolve(func(false)).then(console.log)
Promise.resolve(func(true)).catch(console.log)

[lock[bot]]

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