angular-cn/packages/compiler-cli/ngcc/test
Alex Rickabaugh b381497126 feat(ngcc): add a migration for undecorated child classes (#33362)
In Angular View Engine, there are two kinds of decorator inheritance:

1) both the parent and child classes have decorators

This case is supported by InheritDefinitionFeature, which merges some fields
of the definitions (such as the inputs or queries).

2) only the parent class has a decorator

If the child class is missing a decorator, the compiler effectively behaves
as if the parent class' decorator is applied to the child class as well.
This is the "undecorated child" scenario, and this commit adds a migration
to ngcc to support this pattern in Ivy.

This migration has 2 phases. First, the NgModules of the application are
scanned for classes in 'declarations' which are missing decorators, but
whose base classes do have decorators. These classes are the undecorated
children. This scan is performed recursively, so even if a declared class
has a base class that itself inherits a decorator, this case is handled.

Next, a synthetic decorator (either @Component or @Directive) is created
on the child class. This decorator copies some critical information such
as 'selector' and 'exportAs', as well as supports any decorated fields
(@Input, etc). A flag is passed to the decorator compiler which causes a
special feature `CopyDefinitionFeature` to be included on the compiled
definition. This feature copies at runtime the remaining aspects of the
parent definition which `InheritDefinitionFeature` does not handle,
completing the "full" inheritance of the child class' decorator from its
parent class.

PR Close #33362
2019-10-25 09:16:50 -07:00
..
analysis feat(ngcc): enable migrations to apply schematics to libraries (#33362) 2019-10-25 09:16:50 -07:00
dependencies feat(ngcc): support ignoreMissingDependencies in ngcc config (#33192) 2019-10-17 19:43:39 -04:00
entry_point_finder fix(ngcc): do not analyze dependencies for non Angular entry-points (#32303) 2019-08-26 10:08:44 -07:00
execution perf(ngcc): process tasks in parallel in async mode (#32427) 2019-09-09 15:55:13 -04:00
helpers feat(ngcc): enable private NgModule re-exports in ngcc on request (#33177) 2019-10-22 13:14:31 -04:00
host refactor(ivy): mark synthetic decorators explicitly (#33362) 2019-10-25 09:16:49 -07:00
integration feat(ngcc): add a migration for undecorated child classes (#33362) 2019-10-25 09:16:50 -07:00
logging feat(compiler-cli): ngcc - make logging more configurable (#29591) 2019-04-01 11:53:28 -07:00
migrations refactor(ngcc): rework undecorated parent migration (#33362) 2019-10-25 09:16:50 -07:00
packages feat(ngcc): enable private NgModule re-exports in ngcc on request (#33177) 2019-10-22 13:14:31 -04:00
rendering refactor(ivy): mark synthetic decorators explicitly (#33362) 2019-10-25 09:16:49 -07:00
writing refactor(ngcc): abstract updating `package.json` files behind an interface (#32427) 2019-09-09 15:55:13 -04:00
BUILD.bazel feat(ngcc): add a migration for undecorated child classes (#33362) 2019-10-25 09:16:50 -07:00
utils_spec.ts refactor(ivy): ngcc - implement new module resolver (#29643) 2019-04-29 12:37:21 -07:00