Ngtsc error shown since last Typescript update

[mcarraragh]

Hi, I've upgraded my Angular project lately (from an earlier 18.X to the 18.2.8) which also upgraded Typescript. Sublime Text is now showing the error "this kind of expression is always falsy" (ngtsc 2873), which is a bit annoying since the code is actually working.

The culprit is the ?. operator whenever I use it on an optional variable. For example: <app-configuration-panel [configuration]="currentApp?.configuration" /> (perfectly valid, the input accepts undefined/null values).

I don't have any TS error if I disable Ngx HTML so I believe that this is the plugin that handles TS's errors in HTML templates. Is there a way to disable specific TS errors? I'd like to keep the ones that cause compilation errors and disable only the 2873. I've tried using tsc-silent but it didn't work.

Thanks for your help!

[princemaple]

Disabling this package only makes it not recognised by the language server. This package has nothing to do with diagnosis. It only provides syntax highlighting.

[princemaple]

I ran into this problem, too. I haven't got the time to fix it. The fix will probably be in lsp-angular, or in my own configs.

[mcarraragh]

Ok thanks! I'll check LSP-Angular to see if there's anything there (yet).

[princemaple]

So I finally got to this. Looks like it's because LSP-angular upgraded to ts 5.6 too soon. The fix is easy, though. Simply install @angular/language-server and typescript@5.5.4 somewhere (in my case at ~/tmp/angular-ls/) and point LSP-angular to use that.

An example for Windows users, *nix users can simply replace the path with *nix format

{
  "command": [
    "${node_bin}", "C:\\Users\\chenp\\tmp\\angular-ls\\node_modules\\@angular\\language-server\\index.js",
    "--logFile", "C:\\Users\\chenp\\tmp\\angular-ls\\ngls.log",
    "--ngProbeLocations", "C:\\Users\\chenp\\tmp\\angular-ls\\node_modules",
    "--tsProbeLocations", "C:\\Users\\chenp\\tmp\\angular-ls\\node_modules",
    "--stdio"
  ],
}

LSP-angular also has an example at the bottom of its readme for projects that have language server package as part of its dependencies, that would work on any platform.