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These unused mutable bindings produce worse build output when building Ember with rollup. And they're wordier anyway.
Depending on what build environment the test suite is using, class names could get mangled (because they're getting merged into a shared module namespace for example). This makes the tests not care.
This is arguably just cleaner style, but the reason I care in particular is that there is a bug in babel such that under certain settings this emits:
```js
class Registry {
// ...
set
constructor() {
// ...
}
}
```
which is a syntax error because it looks like your constructor is a setter.
With `declare`, typescript completely removes the pointless runtime field initializer.
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These are three small changes extracted from #20675 for ease of review. Each commit is self-contained with its own description.