Which @angular/* package(s) are relevant/related to the feature request?

service-worker

Description

The option refreshAheadMs is not copied to the the ngsw.json in this code:

Proposed solution

Add it there and the schema https://github.com/angular/angular/blob/253ac15ae89755f6830f3cf567c80de20d013663/packages/service-worker/config/schema.json

Alternatives considered

Have a block that is copied as is or have fields modified without recreating the config to avoid issues when new features are added to the service worker config. ie: clone the object before modifying it (calling parseDurationToMs...) to avoid loosing options... and have a looser schema