This commit ensures that errors during `ApplicationRef.tick` are
surfaced to the callsite rather than being caught and reported to the
`ErrorHandler`.
The current catch and report approach was originally
added in e263e19a2a
with the goal of preventing automatic change detection crashes due to
the error happening in the subscription. However, this results in hiding
a public API that can hide errors. Callers cannot assume that the tick
was successful and perform follow-up work.
This change now surfaces errors and adds the error handling directly to
the callsites.
BREAKING CHANGE: `ApplicationRef.tick` will no longer catch and report
errors to the appplication `ErrorHandler`. Errors will instead be thrown out of
the method and will allow callers to determine how to handle these
errors, such as aborting follow-up work or reporting the error and
continuing.
PR Close#60102
Note that this does NOT use the retrieve method yet. I believe we need to move the logic for notFoundValue into the inject implementation.
PR Close#60154
If we want to target an input write to a directive, we have to know the index at which its instance is stored. Technically we can already find this by looking through `TView.data`, but that'll require a linear lookup for each write which can get slow.
These changes introduce the new `TNode.directiveToIndex` map which allows us to quickly find the index of a directive based on its definition, as well as any host directives that its might've brought in.
PR Close#60075
Currently `TNode.inputs`/`TNode.outputs` store all of the available bindings on that node, no matter if they came from a directive that the user applied directly or from a host directive. This has a couple of drawbacks:
1. We need to store more information that necessary. For example, the only reason we have strings in the arrays is to facilitate host directive aliasing.
2. It doesn't allow us to distinguish which host directives belong to which selector-matched directives.
These changes are a step towards resolving both issues by storing the host directive binding information in separate data structures.
PR Close#60036
Currently the values in `DirectiveDef.inputs` are either strings or arrays, depending if there are flags. This makes it a bit hard to work with, because each time it's read, the consumer needs to account for both cases.
These changes rework it so the values are always an arrays.
PR Close#59980
Prior to this change, a scheduled root effect, even if destroyed instantly, would still run at least once.
This commit fixes this.
fixes#59410
PR Close#59415
Adds the `getDeferBlocks` function to the global `ng` namespace which returns information about all `@defer` blocks inside of a DOM node. This information can be useful either directly in the browser console or to implement future functionality in the dev tools.
PR Close#59184
Angular DevTools is working on developing signal debugging support. This commit is a step in the direction of making available debug information to the framework that will allow Angular DevTools to provide users with more accurate information regarding the usage of signals in their applications.
Follow up PRs that will use this arg will:
- Develop a typescript transform that will detect usages of signal functions and attempt to add a debugName without the user needing to specify one directly
- Develop debug APIs for discovering signal graphs within Angular applications (using debugName as a way to label nodes on the graph)
PR Close#57073
Previously, effect() would handle errors differently depending on the effect
type. Root effects had a try/catch that would execute them independently and
report errors to `ErrorHandler`, while component effects would "crash" CD.
This commit switches all effects to use the same error handling (errors
always reach the CD error handler).
An additional unrelated refactoring is thrown in which removes the
`pendingTask` machinery from root effects, since they make `ApplicationRef`
dirty and thus trigger the scheduler.
PR Close#57952
The original effect design for Angular had one "bucket" of effects, which
are scheduled on the microtask queue. This approach got us pretty far, but
as developers have built more complex reactive systems, we've hit the
limitations of this design.
This commit changes the nature of effects significantly. In particular,
effects created in components have a completely new scheduling system, which
executes them as a part of the change detection cycle. This results in
behavior similar to that of nested effects in other reactive frameworks. The
scheduling behavior here uses the "mark for traversal" flag
(`HasChildViewsToRefresh`). This has really nice behavior:
* if the component is dirty already, effects run following preorder hooks
(ngOnInit, etc).
* if the component isn't dirty, it doesn't get change detected only because
of the dirty effect.
This is not a breaking change, since `effect()` is in developer preview (and
it remains so).
As a part of this redesigned `effect()` behavior, the `allowSignalWrites`
flag was removed. Effects no longer prohibit writing to signals at all. This
decision was taken in response to feedback / observations of usage patterns,
which showed the benefit of the restriction did not justify the DX cost.
The new effect timing is not yet enabled - a future PR will flip the flag.
PR Close#56501
We had some tests that were leaking LViews, because we were testing things like `createComponent`, but not destroying them afterwards. These changes clean up most of them, although there are a handful still left that I didn't have time to fully track down.
PR Close#57546
The `afterRender` infrastructure was first implemented around the idea of
independent, singular hooks. It was later updated to support a spec of
multiple hooks that pass values from one to another as they execute, but the
implementation still worked in terms of singular hooks under the hood. This
creates a number of maintenance issues, and a few bugs. For example, when
one hook fails, further hooks in the pipeline should no longer execute, but
this was hard to ensure under the old design.
This refactoring restructures `afterRender` infrastructure significantly to
introduce the concept of a "sequence", a collection of hooks of different
phases that execute together. Overall, the implementation is simplified
while making it more resilient to issues and future use cases, such as the
upcoming `afterRenderEffect`.
As part of this refactoring, the `internalAfterNextRender` concept is
removed, as well as the unused `queueStateUpdate` concept which used it.
PR Close#57453
This commit updates serialization and hydration i18n logic to take into account situations when i18n blocks are located within "skip hydration" blocks.
Resolves#57105.
PR Close#57299
These changes replace most usages of `removeChild` with `remove`. The latter has the advantage of not having to look up the `parentNode` and ensure that the child being removed actually belongs to the specific parent.
The refactor should be fairly safe since all the browsers we cover support `remove`. [Something similar was done in Components](https://github.com/angular/components/pull/23592) some time ago and there haven't been any bug reports as a result.
PR Close#57203
Fixes that the runtime implementation of `ɵɵngDeclareDirective` was interpreting the `hostDirectives` mapping incorrectly. Instead of treating the inputs/outputs as `['binding', 'alias']` arrays, it was parsing them as `['binding: alias']`. This was leading to runtime errors if a user is consuming a partially-compiled library in JIT mode.
Fixes#54096.
PR Close#57002
Adds the implementation of the following new instructions:
* `declareLet` - creation-time instruction that initializes the slot for a let declaration.
* `storeLet` - update-time instruction that stores the current value of a let declaration.
* `readContextLet` - instruction that reads the stored value of a let declaration from a different view.
On top of the instructions, it also introduces a new `LetDeclaration` TNode type.
The new TNode is nececessary for DI to work correctly in pipes inside the let expression,
as well as for proper hydration support.
PR Close#56527
This commit starts exposing `isSignal` for inputs in the
`ComponentMirror`. We initially had this as a draft when rolling out
signal inputs, but there were no good use-cases, so we skipped it.
Now, inside G3, for the testing infrastructure and rolling out
advancements for signal inputs, having this information is necessary and
allows identifying signal inputs without "accessing fields" on the class
that may cause side-effects (like triggering setters).
PR Close#56402
Builds on top of the previous changes to add support for deferred blocks during partial compilation. To do this, the following changes had to be made:
* The metadata passed into `ɵɵngDeclareComponent` has an additional field called `deferBlockDependencies` which has an array of the dependency loading functions for each defer block in the template. During linking, the dependency functions are loaded by matching their template index to the index in the `deferBlockDependencies` array.
* There's a new `ɵɵngDeclareClassMetadataAsync` function that is created for components that have deferred dependencies. It gets transpiled to `setClassMetadataAsync` and works in the same way by capturing a dependency loading function and setting the metadata after the dependencies are resolved. It also has some extra fields for capturing the version which are standard in linker-generated code.
* Deferred import statements are now stripped in partial compilation mode, similar to full compilation.
PR Close#54908
In order to serialize and hydrate i18n blocks, we need to be able to walk an AST for the translated message. This AST is generated during normal parsing of the message.
PR Close#54724
In zone-full applications, this is already true because effects are
scheduled inside a microtask and tracked by ZoneJS. When not using
zones, this should stay consistent on principle and for testability
reasons. A general pattern with zoneless testing will be to update state
and `await` some promise (i.e. `fixture.whenStable`, which will be
linked to `ApplicationRef.isStable`).
PR Close#53835
One downside of implicit dependency tracking in `effect()`s is that it's easy
to for downstream code to end up running inside the effect context by accident.
For example, if an effect raises an event (e.g. by `next()`ing a `Subject`), the
subscribers to that `Observable` will run inside the effect's reactive context,
and any signals read within the subscriber will end up as dependencies of the
effect. This is why the `untracked` function is useful, to run certain
operations without incidental signal reads ending up tracked.
However, knowing when this is necessary is non-trivial. For example, injecting
a dependency might cause it to be instantiated, which would run the constructor
in the effect context unless the injection operation is untracked.
Therefore, Angular will automatically drop the reactive context within a number
of framework APIs. This commit addresses these use cases:
* creating and destroying views
* creating and destroying DI injectors
* injecting dependencies
* emitting outputs
Fixes#54548
There are likely other APIs which would benefit from this approach, but this
is a start.
PR Close#54614
Fixes that `ɵunwrapWritableSignal` inferring getter functions as not matching the interface of `WritableSignal` instead of preserving them.
PR Close#54252
In a previous commit the TCB was changed to cast the assignment to an input in order to widen its type to allow `WritableSignal`. This ended up breaking existing inputs whose setter has a wider type than its getter. These changes switch to unwrapping the value on the binding side.
PR Close#54252
Reworks the TCB for two-way bindings to make them simpler and to avoid regressions for two-way bindings to generic inputs. The new TCB looks as follows:
```
var _t1: Dir;
var _t2 = _t1.input;
(_t1 as typeof _t2 | WritableSignal<typeof _t2>) = expression;
```
PR Close#54252
Similar to signal-based inputs, we support signal-based queries in JIT
by expecting a decorator to be added. This is a consequence of the
design, given that JIT requires query declaration information before
the class is initialized- but ironically there is no way to collect this
information without instantiating the class.
A JIT transform in the Angular CLI will automatically generate these
decorators for testing.
PR Close#54019
This commit changes the `HasTransform` flag to be only concerned with
decorator inputs. This allows us to automatically detect signal input
transforms without reliance on the flag, resulting in less complexity in
the compiler (as outlined in the design doc) and various other places,
while it also allows us to simplify JIT support for signal inputs
because there would be no need to capture the "hasTransform" state in
the decorator so that JIT can generate the according input flags.
`isSignal` will still persist as an input flag to allow for monomorphic
and highly efficient distinguishing at runtime, whether an input is
signal based or not. JIT transform will also need to propagate this
information to the runtime somehow.
PR Close#53808
We generate `advance` instructions before most update instructions and the majority of `advance` calls are advancing by one. We can save some bytes for the most common case by omitting the parameter for `advance(1)` altogether.
PR Close#53845
This PR provides strict type definition for the window.ng object used
for both console debugging and devtools. `GlobalDevModeUtils` now
gathers all type information about all methods exposed on window.ng.
PR Close#53439
