Currently we use some short variable names like `t` and `r` in the generated factory functions. They can conflict with local symbols with the same names, if they're used for DI.
These changes rename the parameters to reduce the change for conflicts.
Fixes#57168.
PR Close#57181
Currently we use some short variable names like `t` and `r` in the generated factory functions. They can conflict with local symbols with the same names, if they're used for DI.
These changes add a `ɵ` to the generated variables to reduce the chance of conflicts.
Fixes#57168.
PR Close#57181
Some Angular template instructions that follow each other may be chained
together in a single expressions statement, containing a deeply nested
AST of call expressions. The number of chained instructions wasn't previously
limited, so this could result in very deep ASTs that cause stack overflow
errors during TypeScript emit.
This commit introduces a limit to the number of chained instructions to
avoid these problems.
Closes#57066
PR Close#57069
Currently the logic that maps a name to a variable looks at the variables in their definition order. This means that `@let` declarations from parent views will always come before local ones, because the local ones are declared inline whereas the parent ones are hoisted to the top of the function.
These changes resolve the issue by giving precedence to the local variables.
Fixes#56737.
PR Close#56752
Enables the new `@let` syntax by default.
`@let` declarations are defined as:
1. The `@let` keyword.
2. Followed by one or more whitespaces.
3. Followed by a valid JavaScript name and zero or more whitespaces.
4. Followed by the `=` symbol and zero or more whitespaces.
5. Followed by an Angular expression which can be multi-line.
6. Terminated by the `;` symbol.
Example usage:
```
@let user = user$ | async;
@let greeting = user ? 'Hello, ' + user.name : 'Loading';
<h1>{{greeting}}</h1>
```
Fixes#15280.
PR Close#56715
These changes integrate let declarations into the template pipeline. This involves a few operations:
* Producing a `declareLet` instruction call at creation time to initialize the declaration.
* Producing a `storeLet` instruction call in the place of the let declaration, including the necessary `advance` calls beforehand.
* For let declarations used within their declaration view, moving the `const` to be placed right after the `storeLet` call to ensure the their value has been computed.
* For let declarations that are _only_ used in their declaration view, removing the `storeLet` call and inlining the expression into the constant statement.
PR Close#56299
Currently we optimize methods that pass both `$index` and the item into a method. We can take this a step further by also optimizing calls that only pass `$index` into the first parameter.
PR Close#55872
Currently whenever a compliance test case TS file is modified, all
compliance tests in repository are rebuilt in partial compilation mode.
This is inefficient and also slows down local development where one may
use a wildcard to run all test targets inside `/test/compliance/...`.
This commit fixes this.
PR Close#55594
Previously the input flags were being generated as a reference to an enum member for better readability and under the assumption that minifiers would inline the values. That doesn't appear to be the case so these changes switch to using the literal values instead.
PR Close#55215
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
Previously only the first branch of an `if` block was captured for content projection. This was done because of some planned refactors in the future. Since we've decided not to apply those refactors to conditionals, these changes update the compiler to capture each branch individually for content projection purposes.
PR Close#54921
Currently when aliasing a `for` loop variable with `let`, we replace the variable's old name with the new one. Since users have found this to be confusing, these changes switch to a model where the variable is available both under the original name and the new one.
Fixes#52528.
PR Close#54942
Previously we assumed that if a `for` loop tracking function is in the form of `someMethod($index, $item)`, it will be pure so we didn't pass the parameter to bind the context to it. This appears to be risky, because we don't know if the method is trying to access `this`.
These changes play it safe by always binding method-based tracking functions.
Fixes#53628.
PR Close#54960
Updates the instruction generation for two-way bindings to only emit the `twoWayBindingSet` call when writing to template variables. Since template variables are constants, it's only allowed to write to them when they're signals. Non-signal values are flagged during template type checking.
Fixes#54670.
PR Close#54714
Many acceptance tests define goldens for both `TemplateDefinitionBuilder` and Template Pipeline. All such tests have had the TDB golden files removed, and the corresponding expectations adjusted.
PR Close#54757
`TemplateDefinitionBuilder` is the legacy template compiler, and was replaced by Template Pipeline as the default in v17.3.
This PR attempts to delete `TemplateDefinitionBuilder`, `ExpressionConverter`, and various helpers (i18n context, style builder, property visitors, etc).
Consider this a first pass: a lot of code has not yet been deleted (e.g. old TDB-specific test cases), and I'm sure I have missed additional helper code.
PR Close#54757
This commit replaces `fake_core` with the real `@angular/core`
output. See previous commit for reasons.
Overall, this commit:
* Replaces references of `fake_core`
* Fixes tests that were testing Angular compiler detection that _would_
already be flagged by type-checking of TS directly. We keep these
tests for now, and add `@ts-ignore` to verify the Angular checks, in
case type checking is disabled in user applications- but it's worth
considering to remove these tests. Follow-up question/non-priority.
* Adds `@ts-ignore` to the tests for `defer` 1P because the property is
marked as `@internal` and now is (correctly) causing failures in the
compiler test environment.
* Fixes a couple of tests with typos, wrong properties etc that
previously weren't detected! A good sign.
PR Close#54650
Template pipeline is now the default template compiler.
A pair of source map tests is failing, related to DI in JIT mode; I will fix and re-enable these during the preview period.
PR Close#54571
This commit addresses a problem with PR #53695 that introduced support for default imports,
where the actual dynamic import used in the defer loading function continued to use the
symbol name, instead of `.default` for the dynamic import. This issue went unnoticed in the
testcase because a proper instance was being generated for the `ɵsetClassMetadataAsync` function,
but not the generated dependency loader function.
Fixes#54491
PR Close#54495
Currently we have two fake copies of `@angular/core` in the compiler tests which can be out of sync and cause inconsistent tests. These changes reuse a single copy instead.
PR Close#54344
Currently, when two components are named `TestComponent`, and both would
use e.g. control flow. Templates would be generated by the compiler and
those would conflict at runtime because the names for the template
functions are not ensured to be unique.
This seems like a more general problem that could be tackled in the
future in the template pipeline by always using the `ConstantPool`, but
for now, we should be good already, given us ensuring the `baseName`'s are
always unique.
PR Close#54273
Adds compliance output tests for `output()` to verify that
we are emitting proper full compilation output, as well as proper
partial compilation output that can be linked to match the full output.
PR Close#54217
Updates the template definition builder to emit the new format for the listener side of two-way bindings.
```js
// Before
listener("ngModelChange", function($event) {
return ctx.name = $event;
});
// After
ɵɵtwoWayListener("ngModelChange", function($event) {
ɵɵtwoWayBindingSet(ctx.name, $event) || (ctx.name = $event);
return $event;
});
```
PR Close#54154
Reworks the compiler so that it generates a `twoWayProperty` instruction, instead of `property`, for the property side of a two-way binding. Currently the new instruction passes through to `property`, but it'll have some two-way-binding-specific logic in subsequent PRs.
PR Close#54154
This commit separates `InputSignal` for input signals with transforms.
The reason being that most of the time, signal inputs are not using
transforms and the generics are rather confusing.
Especially for users with inferred types displayed in their IDEs, the
input signal types are seemingly complex, even if no transform is used.
For this reason, we are introducing a new type called
`InputSignalWithTransform`. This type will be used for inputs with
transforms, while non-transform inputs just use `InputSignal`.
A notable fact is that `InputSignal` extends `InputSignalWithTransform`,
with the "identity transform". i.e. there is no transform. This allows
us to share the code for input signals. In practice, we don't expect
users to pass around `InputSignal`'s anyway.
PR Close#54053
Previously, defer deps fns names were only prefixed with the component name, meaning that distinct deps fns in the same component would produce a name collision. Now, we take into account the entire template function name when naming inner deps fns.
PR Close#54060
Collapses multiple sibling query advance statements into single
query advance invocations. This will help reducing generated code
for directives/components with many queries.
PR Close#54019
Previously, if an ICU was inside a nested i18n root, it would use the nested root to calculate whether it should be applied. Now, we use the root i18n block.
PR Close#54026
This commit adds compliance tests to ensure that the generated output of
signal-based queries matches our expectation.
Note: collapsing query advance instructions is not implemented yet.
PR Close#53978
This commit introduces the compiler output generation for signal-based
queries. Signal-based queries will have new creation-mode instructions
and update instructions to advance the current query indices in the
global shared context.
An output like the following is the expected output for signal-based
queries:
```
i0.ɵɵdefineComponent({
viewQuery: function App_Query(rf, ctx) {
if (rf & 1) {
i0.ɵɵviewQuery(ctx.d, _c0, 5);
i0.ɵɵviewQuerySignal(ctx.ds1, _c0, 5);
i0.ɵɵviewQuerySignal(ctx.ds2, _c0, 5);
}
if (rf & 2) {
let _t;
// only change-detected queries need explicit refresh
i0.ɵɵqueryRefresh(_t = i0.ɵɵloadQuery()) && (ctx.d = _t.first);
// we bump up current query index by 2 positions since there are 2 signal-based queries
i0.ɵɵqueryAdvance(2);
}
…
},
…
});
```
Note: For now, the collapsing of multiple advance instructions is not
implemented. This will be a follow-up.
Note 2: A couple of query helpers are now in their own file. This makes
it easier to focus on query-specific compiler code. The new function is
called `createQueryCreateCall`, which is a modified variant of the
existing function that previously only generated query parameters.
PR Close#53978
Adds signal input compliance tests, ensuring linking works as expected,
partial output is generated properly, types are inferred properly, and
that the full, or linked output matches our expected runtime structure.
PR Close#53808
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
In some cases, the input files for a partial output generation
compliance tests may be invalid and lead to compilation errors.
The golden partial would be silently generated with the remaining
test cases. Instead of hiding errors, we will now print these and
cause the script to fail properly.
Note that the error logging is pretty minimalistic, but it's sufficient.
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
Instead of computing the bit input flags at compile-time and inling
the final bit flag number, we will use the `InputFlags` enum directly.
This is a little more code in the compiler side, but will allow us to
have better debuggable development code, and also prevents problems
where runtime flag bitmasks differ from the compiler flag bitmasks.
This is in practice a noop for optimized applications as the enum values
would be inlined anyway. This matches existing compiler emit for e.g.
change detection strategy, or view encapsulation enums.
PR Close#53571
The linker compliance tests were disabled with a Babel update and
nobody realized for quite a while, via
https://github.com/angular/angular/pull/49914.
As we've came across this lost coverage, which also is quite
impactful as all libraries depend on linked output- I've took initiative
to debug the root cause as there was no follow-up.
https://github.com/angular/angular/issues/51647.
It turned out to be a highly complex issue that is non-trivial to fix,
but at least we should try to resurrect the significant portion of test
coverage by still running the linker tests- avoiding regressions, or
unexpected issues (like with defer being developed). We can work on
re-enabling and fixing source-maps separately.
Tracked via https://github.com/angular/angular/issues/51647.
PR Close#53571
The linker compliance tests did not run for a while. There were a couple
of new tests that were not passing as this wasn't flagged on CI. This commit fixes this.
Fortunately there was no problematic code that did indicate issues with linking.
In the follow-up commit, we fix the compliance test infrastructure to
re-enable linker testing..
One clear issue is still that the defer blocks are not handled properly
in linked output- hence making defer not actually "lazy" for compiled
libraries. This needs to be handled separately by the framework team.
PR Close#53571
