When making use of the `useBuiltIns: 'usage'` option for @babel/preset-env
(which is the case for all transpiled packages in Embark's monorepo) a package
needs to have both @babel/runtime-corejs3 and core-js@3 specified as
dependencies.
Embark relies on certain specific plugin properties, e.g. registered compilers,
and retrieves them using `plugins.getPluginProperties('compilers', 'compilers')`.
In order to make this work in the testing environment, we need those same APIs
in the `embark-testing` package as well.
This commit adds necessary APIs to `Plugins` and `Plugin` to make registering and
loading compiler plugins work.
BREAKING CHANGE:
node: >=10.17.0 <12.0.0
npm: >=6.11.3
yarn: >=1.19.1
node v10.17.0 is the latest in the 10.x series and is still in the Active LTS
lifecycle. Embark is still not compatible with node's 12.x and 13.x
series (because of some dependencies), otherwise it would probably make sense
to bump our minimum supported node version all the way to the most recent 12.x
release.
npm v6.11.3 is the version that's bundled with node v10.17.0.
yarn v1.19.1 is the most recent version as of the time node v10.17.0 was
released.