Angular's template files are not valid TypeScript. Attempting to get suggestion
diagnostics from the underlying TypeScript language service will result in
a large amount of false positives. Only actual TypeScript files should
be analyzed by the underlying TypeScript language service for suggestions.
PR Close#56241
Adds a new extended diagnostic that will flag `@let` declarations that aren't used within the template. The diagnostic can be turned off through the `extendedDiagnostics` compiler option.
PR Close#57033
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
When importing a component exported by default, the `default` can't be
used as the component name.
For example:
This is the export declarations:
```ts
export default class TestComponent {}
```
Previously, the output generated by LS looked like this:
```ts
import { default } from "./test.component";
```
Now the output looks like this:
```ts
import TestComponent from "./test.component";
```
Fixes#48689
PR Close#56432
This PR allows the language service to suggest imports for all directives returned from the
compiler, and generate the TypeScript module import and the decorator import when the component
is selected by the user.
PR Close#55595
Introduces a new `LetDeclaration` into the Render3 AST, simiarly to the HTML AST, and adds an initial integration into the various visitors.
PR Close#55848
An implementation of a TypeScript server plugin module factory has
been added to the main plugin code which minimizes the amount of
infrastructure code necessary to directly setup the Angular plugin.
This is not yet used externally but can be integrated in the future.
PR Close#55264
The `getDefinitionAtPosition` function may be called by consumers instead
of `getDefinitionAndBoundSpan` with the later of which already implemented.
The `getDefinitionAtPosition` result is a subset of what `getDefinitionAndBoundSpan`
returns and currently delegates to that function.
PR Close#55269
Within the language service, the Angular compiler instance can provide
access to the current TypeScript program via `getCurrentProgram`. By
using the compiler, the need to pass around the program driver is no longer
required and can also be removed as an instance field of the Angular language
service class. This change also provides a higher assurance that the correct
program is being used throughout each language service request.
PR Close#55097
Angular's template files are not valid TypeScript. Attempting to get syntactic
diagnostics from the underlying TypeScript language service will result in
a large amount of false positive errors. Only actual TypeScript files should
be analyzed by the underlying TypeScript language service for syntactic errors.
PR Close#55091
The custom flatMap implementation can now be removed as Array contains a
native implementation that is available for all supported Node.js versions.
PR Close#55011
When the `angularOnly` option is disabled, the underlying TypeScript language service
was previously used for all files including `.html` template files. This can result in
incorrect responses including a large amount of invalid diagnostics for a template file.
Checks have now been added to only use the Angular Language service for template files
which can properly handle template files. Additionally, the check for a TypeScript file
name has now been expanded to encompass all current file extension forms.
PR Close#55003
Adds logic to ingest the content of an `ng-content` element in the template type checker. We treat `ng-content` as a `ScopedNode`, because its content is inserted conditionally.
PR Close#54854
When creating the Angular Language Service instance, attempts to read
configuration files are now only attempted if the project is considered
a `Configured` project. Such a project has been analyzed by TypeScript
and one or more configuration files (tsconfig/jsconfig) files have been
found for the project.
PR Close#55035
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
The following changes help the language service code build in g3:
* `Omit<T>` produces an index signature, so we must access the resulting properties with square bracket (because `noPropertyAccessFromIndexSignature` is on in g3).
* Explicitly export `absoluteFrom` from `packages/compiler-cli/index.ts`, since the `*` re-export is patched out in g3.
* Remove const from a few const enums, since accessing const enums across modules is not compatible with `isolatedModules` (which is on in g3).
PR Close#54726
Currently the `makeProgram` utility from `ngtsc/testing` does not use
the test host by default- optimizing for source file caching.
Additionally, the host can be updated to attempt caching of the `.d.ts`
files from `@angular/core`— whether that's fake core, or the real core-
is irrelevant. We are never caching if these changes between tests, so
correctness is guaranteed.
This commit reduces the type check test times form 80s to just 11
seconds, faster than what it was before with `fake_core`. The ngtsc
tests also run significantly faster. From 40s to 30s
PR Close#54650
This commit exposes the new `output()` API with numerous benefits:
- Symmetrical API to `input()`, `model()` etc.
- Fixed types for `EventEmitter.emit`— current `emit` method of
`EventEmitter` is broken and accepts `undefined` via `emit(value?: T)`
- Removal of RxJS specific concepts from outputs. error channels,
completion channels etc. We now have a simple consistent
interface.
- Automatic clean-up of subscribers upon directive/component destory-
when subscribed programmatically.
```ts
@Directive({..})
export class MyDir {
nameChange = output<string>(); // OutputEmitterRef<string>
onClick = output(); // OutputEmitterRef<void>
}
```
Note: RxJS custom observable cases will be handled in future commits via
explicit helpers from the interop.
PR Close#54650
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
Previously, the language service relied on deep imports such as `@angular/compiler/render3/...`. This is bad form, because that creates a dependency on the package's internal structure. Additionally, this is not compatible with google3.
In this PR, I replace all the deep imports with shallow imports, in some cases adding the missing symbol to the `compiler.ts` exports.
PR Close#54695
In order to allow both signals and non-signals in two-way bindings, we have to pass the expression through `ɵunwrapWritableSignal`. The problem is that the language service uses a bundled compiler that is fairly new, but it may be compiling an older version of Angular that doesn't expose `ɵunwrapWritableSignal` (see https://github.com/angular/vscode-ng-language-service/issues/2001).
These changes add a `_angularCoreVersion` flag to the compiler which the language service can use to pass the parsed Angular version to the compiler which can then decide whether to emit the function.
PR Close#54423
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
This fixes the definitions for signal-based inputs in the language
service and type checking symbol builder.
Signal inputs emit a slightly different output. The output works well
for comppletion and was designed to affect language service minimally.
Turns out there is a small adjustment needed for the definition symbols.
PR Close#54053
Given that the TCB output changes with signal inputs, and one of our
important considerations was auto-completion, we need some unit tests
that verify and guarantee proper completion with signal inputs being
bound in templates. This commit adds these.
PR Close#53808
Updates the repo to support TypeScript 5.3 and resolve any issues. Fixes include:
* Updating usages of TS compiler APIs to match their new signatures.
* In TS 5.3 negative numbers are represented as `PrefixUnaryExpression` instead of `NumericExpression`. These changes update all usages to account for it since passing a negative number into the old APIs results in a runtime error.
PR Close#52572
The `for` block has several parts which we know are required. This
commit improves the autocomplete snippet of the `for` block by adding
those required parts and providing placeholders.
PR Close#52405
Previously, autocompletions were not available in two main cases. We correct them.
1. Autocompletions immediately after `@` were usually not working, for example `foo @|`. We fix this by causing the lexer to not consider the `@` part of the text node.
2. Autocompletions such as `@\nfoo`, where a newline follows a bare `@`, were not working because the language service visitor considered us inside the subsequent text node. We fix this by adding a block name span for the block keyword, and special-case whether we are completing inside the name span. If we are, we don't continue to the following text node.
PR Close#52198
Charles Lyding