ember-legacy-class-shim
v1.0.5
Published
Backwards compatibility for ES classes in Ember
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746
Readme
ember-legacy-class-shim
This addon adds a shim which reopens EmberObject
and redefines .extend
. This allows
older versions of Ember to use ES Classes with some restrictions.
Why is this needed?
The reason legacy versions of Ember need this transform lies, at its core, in the
double extend
which was used for the longest time to inject services and other things. This double
extend ends up creating a new class altogether which, due to the way classes are handled
internally in Ember, never calls super
.
This means that when we define a class using class
it's constructor never gets run.
A side-effect of this is that class fields, which are assigned in the constructor, do
not get assigned. This substantially reduces the usefulness of class syntax and decorators
since they rely on class fields working as expected.
What does it fix?
This fixes the double extend problem only. Actually fixing .extend
requires changes to
CoreObject directly and won't be fixed until later versions of Ember. Once you start using
native class syntax, you can't go back.
Installation
git clone <repository-url>
this repositorycd ember-legacy-class-shim
npm install
Running
ember serve
- Visit your app at http://localhost:4200.
Running Tests
npm test
(Runsember try:each
to test your addon against multiple Ember versions)ember test
ember test --server
Building
ember build
For more information on using ember-cli, visit https://ember-cli.com/.