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UPGRADING.md

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Upgrading

v8

The most notable breaking changes introduced in v8 are:

  1. The includePolyfill option is no longer supported (458)
  2. @babel/core is now a required peer dependency (452)

Upgrade Path for Apps

Apps that are relying on the includePolyfill option should install core-js, and import core-js/stable directly in app.js. The reason for this is that, @babel/polyfill has been deprecated. More info on this deprecation can be found in the documentation for @babel/polyfill.

Apps are now also required to install @babel/core directly in order to use ember-cli-babel. Making @babel/core a peer dependency ensures that the same version is used by all tooling that require it.

Upgrade Path for Addons

Since (v1) addons bring in their own version of ember-cli-babel, they should now also bring in their own version of @babel/core. This means that, addons should add @babel/core under dependencies in their package.json file. This makes the dependency on @babel/core more explicit while also avoiding addons having to cut a breaking release to update ember-cli-babel to v8.