`packages/upgrade/static/src` is anymlink to `packages/upgrade/src`.
Still, using the correct paths (e.g. using
`@angular/upgrade/static/src/...` for `@angula/upgrade/static` specs
ensures that the module loader (e.g. SystemJS) can map the imports to
the same instances.
PR Close#22167
This wraps the $interval service when using upgrade to run the
$interval() call outside the Angular zone. However, the callback is
invoked within the Angular zone, so changes still propagate to
downgraded components.