Does not work with ember-source 3.27+

[mydea]

On 3.27-beta.4, I get the error:

Uncaught SyntaxError: Cannot use import statement outside a module

[boris-petrov]

I just hit the same issue when upgrading to Ember 3.27.

@rwjblue, @buschtoens - what should we do?

[rwjblue]

This is basically because of

ember-cached-decorator-polyfill/index.js

Lines 16 to 26 in 5759283

	treeForVendor(tree) {
	const babel = this.addons.find(a => a.name === 'ember-cli-babel');
	return babel.transpileTree(tree, {
	babel: this.options.babel,
	'ember-cli-babel': {
	compileModules: false
	}
	});
	},

Specifically, we are telling ember-cli-babel that it shouldn't compile modules. But that isn't going to work quite right (since in Ember 3.27+ the modules are actually directly used).

[rwjblue]

Hmm. I'm not able to reproduce (I checked out this repo and ran its tests). Can someone make a quick reproduction so I can debug?

[boris-petrov]

@rwjblue - it's as simple as:

ember new test-test
cd test-test
# modify package.json to use Ember 3.27
npm install
ember install ember-cached-decorator-polyfill
ember test -s

[rwjblue]

I think emberjs/ember-cli-babel#402 will resolve.

[rwjblue]

please test with https://github.com/babel/ember-cli-babel/releases/tag/v7.26.5

[boris-petrov]

@rwjblue - the same example I gave above still doesn't work even with 7.26.5. :( My project also doesn't work.

[knownasilya]

Using ember-cli-babel v7.26.5 still seeing the issue.

[runspired]

We're also hitting this in EmberData with ember-cli-babel 7.26.5. I noticed this was still resolving an older version though from the lockfile and so I regenerated it and made sure it was resolving 7.26.5. I've confirmed it is still broken even when this addon does resolve 7.26.5, so the fix upstream was insufficient.

[ef4]

I don't think emberjs/ember-cli-babel#402 is complete or correct, see emberjs/ember-cli-babel#402 (comment)

This addon is using import along with compileModules: false. That is a contradiction. It worked by accident on earlier Ember versions, it doesn't work anymore.

As long as compileModules: false is set, you can't author as an ES module, so you can't use import. The simplest fix is to use the Ember global instead, and yes, that will trigger immediate deprecations.

A more complete fix is to refactor this polyfill so it transpiles import { cached } from '@glimmer/tracking' to import { cached } from 'ember-cached-decorator-polyfill' and provides its implementation in treeForAddon instead of treeForVendor, so it's all proper ES modules.

[mydea]

I made a PR with a refactor to using the approach proposed by @ef4 here: #75

[rwjblue]

I paired with @ef4 to make the changes in ember-cli-babel more correct (well, really they are still kinda bonkers but they more correctly emulate the "old world") in emberjs/ember-cli-babel#407.

Testing the reproduction steps provided by @boris-petrov results in a passing test run.

[boris-petrov]

@rwjblue - thanks! That fixed the error from above... but it still doesn't work. 😄

Use the reproduction from above and just add in app.js:

import { cached } from '@glimmer/tracking';

class X {
  @cached
  get foo() {
    return 1;
  }
}

Then running ember test leads to:

Uncaught TypeError: decorator is not a function
    at applyDecoratedDescriptor.js:22
    at Array.reduce (<anonymous>)
    at _applyDecoratedDescriptor (applyDecoratedDescriptor.js:21)
    at Module.callback (store.js:868)
    at Module.exports (loader.js:106)
    at Module._reify (loader.js:143)
    at Module.reify (loader.js:130)
    at Module.exports (loader.js:104)
    at Module._reify (loader.js:143)
    at Module.reify (loader.js:130)

[acorncom]

Confirmed that I'm seeing the same issue as @boris-petrov. Looks like the haxx introduced in #12 may be causing snags here? Reproduction available here: https://github.com/acorncom/cached-decorator-babel-issues-reproduction (latest ember-cli-babel@7.26.6 in use)

In my case, the error thrown is:

applyDecoratedDescriptor.js:16 Uncaught TypeError: decorator is not a function
    at eval (applyDecoratedDescriptor.js:16)
    at Array.reduce (<anonymous>)
    at _applyDecoratedDescriptor (applyDecoratedDescriptor.js:15)
    at eval (test-component.js:49)
    at Module../components/test-component.js (chunk.d76dcaa29bf3c00d6f74.js:92)
    at __webpack_require__ (chunk.7e29ea896c9f6f20b6e2.js:80)
    at Module.eval [as callback] (module-issues.js:70)
    at Module.exports (loader.js:106)
    at requireModule (loader.js:27)
    at Class._extractDefaultExport (index.js:466)

and that seems to be causing issues for ember-page-title.

[acorncom]

Issue opened at #77

[rwjblue]

I landed @mydea's PR and released in https://github.com/ember-polyfills/ember-cached-decorator-polyfill/releases/tag/v0.1.2. I also confirmed in @acorncom's reproduction (from #77) works without issue with that update (tested against both Embroider and non-Embroider builds).