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This allows modifyClass to be used like this:
```
api.modifyClass(
"model:topic",
(Superclass) =>
class extends Superclass {
static someStaticMethod() {
return `${super.someStaticMethod()} modified`;
}
someFunction() {
return `${super.someFunction()} modified`;
}
get someGetter() {
return `${super.someGetter} modified`;
}
}
);
```
One limitation, which is the same as the old object-literal syntax, is that native class fields and constructors cannot be modified.
`@tracked` properties can be overriden, because the decorator turns them into getters/setters.
There is no need to pass a `pluginId` any more. Changes are automatically rolled back as part of test cleanup 🎉