This is similar to ec69b4bb12, which
was about private instance fields.
Private properties can be non-writable (thanks to decorators), or have
get/set accessors. If we stored this information on the `privateClass`
object, we would need to always use `Object.getOwnPropertyDescriptor`
before reading or writing a property because accessors need to be called
with the correct `this` context (it should be the actual class, not the
object hat stores the private properties). This commit simplifies that
operation a bit by removing the container object.
It also have another advantage, which instance fields already have
thanks to the use of separate weakmaps: unused private static fields
can be tree-shaken away or garbage-collected, while properties of an
object can't. Also, they can be easilier minified.
@babel/plugin-proposal-class-properties
This plugin transforms static class properties as well as properties declared with the property initializer syntax
See our website @babel/plugin-proposal-class-properties for more information.
Install
Using npm:
npm install --save-dev @babel/plugin-proposal-class-properties
or using yarn:
yarn add @babel/plugin-proposal-class-properties --dev