How to import a JavaScript file located outside the directory of a function with Node.js?

[simmzl]

Description

Here is the directory structure of my project:

serverless
├── add
│   ├── func.js
│   ├── func.yaml
│   └── package.json
├── app.yaml
└── utils.js

and utils.js just like:

exports.testFn = function () {
  console.log(1)
}

When I import utils.js file inside add/func.js like:

const fdk = require('@fnproject/fdk')
const utils = require('../utils')  // Look here

fdk.handle(function (input) {
  let name = 'World'
  if (input.name) {
    name = input.name
  }
  console.log('\nInside Node Hello World function')
  return { message: 'Hello ' + name }
})

this API /add will return 502 error.

However, when I move utils.js into the /add/ directory, this API works normally.

serverless
├── add
│   ├── func.js
│   ├── func.yaml
│   ├── package.json
│   └── utils.js
├── app.yaml

const fdk = require('@fnproject/fdk')
const utils = require('./utils')  // Look here

fdk.handle(function (input) {
  let name = 'World'
  if (input.name) {
    name = input.name
  }
  console.log('\nInside Node Hello World function')
  return { message: 'Hello ' + name }
})

So, is there any other way to import an external JavaScript file besides installing dependencies via npm i and moving it to the function directory when needed?

Output of fn version (CLI command):

Client version is latest version: 0.6.26
Server version:  ?

Additional environment details (OSX, Linux, flags, etc.):
MacOS Monterey 12.2.1