ESM browser module distribution depends on unsupported import

[besenwagen]

Version

4.0.2

Reproduction link

https://besenwagen.github.io/vue-router-next-broken-esm-browser-dist/

Steps to reproduce

1) Open reproduction URL in a browser 2) Observe TypeError in console

What is expected?

The ES module import is resolved.

What is actually happening?

A TypeError is thrown because 'vue' is not resolvable.

[posva]

I'm aware of this but I couldn't find any standard/agreement on how to write an import on a browser module file without forcing the user to use a specific CDN (which I can't)...

One (quite complicated) way to deal with this is to use a service worker to redirect the request for vue' to a CDN like unpkg or jsdelivr.

FYI, in vue router 3 we handled this the same way it is handled here: https://github.com/vuejs/vue-router/pull/2705

I'm open to suggestions!

[besenwagen]

One (quite complicated) way to deal with this is to use a service worker to redirect the request for vue' to a CDN like unpkg or jsdelivr.

The module URL must be resolved before a request can be initiated (and intercepted). Parsing the message property of a caught exception isn't complicated but madness. Sounds like a job for jQuery. 😂

FYI, in vue router 3 we handled this the same way it is handled here: vuejs/vue-router#2705

I saw that after opening this issue, thanks. It is extremely discouraging that the Vue 2 ecosystem did allow coding like it's 2015. ☹

I'm open to suggestions!

I wish I had any. At this point I fail to see te use case of these build artefacts. The answer is appreciated, anyhow.

[besenwagen]

One (quite complicated) way to deal with this is to use a service worker to redirect the request for vue' to a CDN like unpkg or jsdelivr.

While it's not possible to intercept bare modules because that fails before there is a request, it turns out it's still possible to create a workaround with a service worker:

• fetch the modules from a CDN
• replace the bare imports with URLs in the response body
• put the results in the cache

It's quite mad, but still better than using the global legacy build for modern development without Node.

[posva]

Currently, one needs to use Skypack or https://www.chromestatus.com/feature/5315286962012160 (chrome only). I think this will make sense as a cookbook entry once these topics are more mature

[besenwagen]

Skypack or https://www.chromestatus.com/feature/5315286962012160

Thanks, both were new to me. Cookbook entries and generally more documentation would be great, esm-browser in a CDN file name raises expectations that are not currently met.

[kngai]

Any updates to this issue? I'm getting the same error too in my <script type="module">:

import { createApp, ref, computed, watch, onMounted } from 'https://cdnjs.cloudflare.com/ajax/libs/vue/3.0.7/vue.esm-browser.prod.js'
import { useRoute } from 'https://cdnjs.cloudflare.com/ajax/libs/vue-router/4.0.9/vue-router.esm-browser.js'

Uncaught TypeError: Failed to resolve module specifier "vue". Relative references must start with either "/", "./", or "../".

[AimForNaN]

vue-router.esm-browser.prod.js for latest version doesn't exist (though I'm not sure if that would remove the dependency). @vue/devtools-api dependency is very inconvenient. While import maps are a quick workaround, I would prefer to be without such a dependency for production.

[stefnotch]

It looks like every browser, other than old Safari, supports import maps https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script/type/importmap

I suppose it would be possible to use the ESM browser module, and add a documentation note about "this needs an import map polyfill if you're targeting Safari".

[charlesprescottcollins]

So how does one work around this with skypack?

[9mm]

So I'm trying to use vue-router in browser with import maps... how do I workaround these errors?

pin "vue",                           to: "https://unpkg.com/vue@latest/dist/vue.esm-browser.prod.js"
pin "vue-router",                    to: "https://esm.sh/vue-router"

import { createApp } from "vue";
import { createRouter, createWebHistory } from "vue-router";

This is failing with devtools errors?

[blacelle]

Until @vue/devtools-api is dropped (e.g. into some vue-router.esm-browser.prod.js), one way to move forward is:

<script type="importmap">
{
  "imports": {
    "vue": "https://unpkg.com/vue@3/dist/vue.esm-browser.js",
    "vue-router": "https://unpkg.com/vue-router@4.4.3/dist/vue-router.esm-browser.js",
    "@vue/devtools-api": "https://unpkg.com/@vue/devtools-api@6.2.1/lib/esm/index.js"
  }
}
</script>