Split Business and Native errors Async/Await Node.js

index.js

const { parse } = require('url')
const fetch = require('node-fetch')

/*
  Native Error types
  @link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error#Error_types
*/
const nativeExceptions = [
  EvalError, RangeError, ReferenceError, SyntaxError, TypeError, URIError
].filter(except => typeof except === 'function')

/*
  Throw native errors
  @link https://github.com/gunar/go-for-it/blob/master/src/index.js#L18
*/
function throwNative(error) {
  for (const Exception of nativeExceptions) {
    if (error instanceof Exception) throw error
  }
}

// Helper for removing async/await try/catch
function oops(promise) {
  return promise.then(data => {
    if (data instanceof Error) {
      throwNative(data)
      return [data]
    }
    return [null, data]
  }).catch(error => {
    throwNative(error)
    return [error]
  })
}

async function user (id) {
  return await (await fetch(`https://jsonplaceholder.typicode.com/users/${id}`)).json()
}

async function getUserById (id) {
  try {
    const [error, data] = await oops(user(id))

    if (error) {
      // Business logic errors
      console.log('Business logic error', error)
    }

    // Bail/retry if required data missing
    if (!data) {
      return 'NICE TRY'
    }
    return { data }
  } catch (error) {
    // Native errors
    console.log('Native JS error: ', error)
  }
}

module.exports = async (req, res) => {
  const parsed = parse(req.url, true)
  const { id } = parsed.query
  try {
    return await getUserById(id)
  } catch (error) {
    console.log('Final catch: ', error)
  }
}