Originally, the ivy_switch mechanism used Bazel genrules to conditionally
compile one TS file or another depending on whether ngc or ngtsc was the
selected compiler. This was done because we wanted to avoid importing
certain modules (and thus pulling them into the build) if Ivy was on or
off. This mechanism had a major drawback: ivy_switch became a bottleneck
in the import graph, as it both imports from many places in the codebase
and is imported by many modules in the codebase. This frequently resulted
in cyclic imports which caused issues both with TS and Closure compilation.
It turns out ngcc needs both code paths in the bundle to perform the switch
during its operation anyway, so import switching was later abandoned. This
means that there's no real reason why the ivy_switch mechanism needed to
operate at the Bazel level, and for the ivy_switch file to be a bottleneck.
This commit removes the Bazel-level ivy_switch mechanism, and introduces
an additional TypeScript transform in ngtsc (and the pass-through tsc
compiler used for testing JIT) to perform the same operation that ngcc
does, and flip the switch during ngtsc compilation. This allows the
ivy_switch file to be removed, and the individual switches to be located
directly next to their consumers in the codebase, greatly mitigating the
circular import issues and making the mechanism much easier to use.
As part of this commit, the tag for marking switched variables was changed
from __PRE_NGCC__ to __PRE_R3__, since it's no longer just ngcc which
flips these tags. Most variables were renamed from R3_* to SWITCH_* as well,
since they're referenced mostly in render2 code.
Test strategy: existing test coverage is more than sufficient - if this
didn't work correctly it would break the hello world and todo apps.
PR Close#26550
Since #26396, the `title` property is ignored and `header` should be
used instead for specifying a code snippet's header.
This commit ensures that we don't accidentally set `title` have it be
silently ignored.
PR Close#26514
Added word *relative* to the **Routes at the app level** section description. This was not specified before. The routes in the *lazy-loading-ngmodules/src/app/app-routing.module.ts* also had `loadChildren` values starting with `app/...`.
The code for `app-routing.module.ts` is already fixed in [this commit](67ad9468d3)
PR Close#26504
Change the headings of the template-driven forms guide page.
This makes the first heading consistent with other guide pages and the menu label reducing confusion to users browsing the guide.
PR Close#25900
* If all guards return `true`, operator returns `true`
* `false` and `UrlTree` are now both valid returns from a guard
* Both these values wait for higher priority guards to resolve
* Highest priority `false` or `UrlTree` value will be returned
PR Close#26478
Pete Bacon Darwin
Olivier Combe
Alex Rickabaugh
Miško Hevery
Igor Minar
Kara Erickson
Alan
Rob Phoenix
null-reference
lovelangy
George Kalpakas
Siddharth Ajmera
Pawel Kozlowski
Judy Bogart
jenniferfell
William Marques
Andrew Kushnir
Vladimir Erygin
George Wilde
Matias Niemelä
Jason Aden