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YanGeruch opened this issue May 23, 2025 · 3 comments
Open

@let doesn't support string interpolation using @let var = '{{ variable }}' syntax #61643

YanGeruch opened this issue May 23, 2025 · 3 comments
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area: language-service Issues related to Angular's VS Code language service
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needsTriage

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@YanGeruch
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YanGeruch commented May 23, 2025 •
edited
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Which @angular/* package(s) are the source of the bug?

compiler

Is this a regression?

No

Description

@let template syntax doesn't support standard angular interpolation syntax like @let var = '{{ variable }}'. meanwhile language services highlight these variables inside strings as interpolated.

Image

Please provide a link to a minimal reproduction of the bug

https://stackblitz.com/edit/stackblitz-starters-6wvun8yy?file=src%2Fmain.ts

Please provide the exception or error you saw

Please provide the environment you discovered this bug in (run ng version)

Angular CLI: 19.2.3
Node: 18.20.4
Package Manager: npm 10.7.0
OS: win32 x64

Angular: 19.2.2
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... platform-server, router, service-worker

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1902.3
@angular-devkit/build-angular   19.2.3
@angular-devkit/core            19.2.3
@angular-devkit/schematics      19.2.3
@angular/cdk                    19.2.3
@angular/cli                    19.2.3
@angular/material               19.2.3
@schematics/angular             19.2.3
rxjs                            7.8.1
typescript                      5.8.2
zone.js                         0.15.0

Anything else?

No response
@YanGeruch YanGeruch changed the title @let doesn't support string interpolation using @let = '{{ variable }}' syntax @let doesn't support string interpolation using @let var = '{{ variable }}' syntax May 23, 2025
@YanGeruch
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on the other note interpolated signals have their name highlighted correctly but parenthesis () are highlighted as plain strings. (as you can see on screenshot). so there is also issue in language services

@JoostK
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JoostK commented May 23, 2025 •
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The strings here are already Angular binding expressions, so it is correct that interpolation syntax cannot be used. This is therefore a highlighting issue.

@JoostK JoostK added the area: language-service Issues related to Angular's VS Code language service label May 23, 2025
@ngbot ngbot bot added this to the needsTriage milestone May 23, 2025
@JoostK
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JoostK commented May 23, 2025

That said, highlighting is implemented in https://github.com/angular/vscode-ng-language-service, not in the language service support in the compiler.

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