ts errors in js files

Initially, I filed this error with VSCode: https://github.com/microsoft/vscode/issues/102320#issuecomment-659692891

I suspected VSCode because it was just updated, yet I installed Deno at the same time. It turned out that it is clearly related to the Deno extension. See below.

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As soon as I upgraded to 1.47 all my purely JS projects started to show TS errors. I don’t have TS on my system, nor jsconfig or tsconfig, yet even trivial code produces errors. Before 1.47 it was totally usable for JS/ES projects.

Example of an error to illustrate what I am talking about:

const identity = x => x;

In this example x is highlighted with a red squiggly line showing this error:

(parameter) x: any
Parameter 'x' implicitly has an 'any' type.ts (7006)
Peek Problem (⌥F8) No quick fixes available

Why is it an error? I don’t want to fix it.

Obviously, if I try to add a type annotation, it errors showing:

Type annotations can only be used in TypeScript files.ts (8010)
Peek Problem (⌥F8) No quick fixes available

Which is totally fair. At least we know that it understands that this file is not TS.

Why it is bad and makes my life hell:

• In the minimap it shows bright red on every line preventing overviewing searches and so on.
• In the file view (Explorer) all open files are red. I use colors for modified and newly added files. Now I don’t know the git status until I close files.
• I don’t like seeing errors where there are no errors. 😃

This is my settings.json just to see that it doesn’t have any funny business:

Click me to expand:

{

    "gitlens.advanced.messages": {
        "suppressShowKeyBindingsNotice": true
    },
    "editor.fontLigatures": true,
    "editor.fontFamily": "Fira Code",
    "sync.gist": "0aadafae52deaff8d740ba461b9349c9",
    "sync.quietSync": false,
    "sync.removeExtensions": true,
    "sync.syncExtensions": true,
    "sync.autoDownload": false,
    "sync.autoUpload": false,
    "sync.forceDownload": false,
    "window.zoomLevel": 1,
    "breadcrumbs.enabled": true,
    "cSpell.enabledLanguageIds": [
        "asciidoc",
        "c",
        "cpp",
        "csharp",
        "css",
        "go",
        "handlebars",
        "html",
        "jade",
        "javascript",
        "javascriptreact",
        "json",
        "latex",
        "less",
        "markdown",
        "php",
        "plaintext",
        "pub",
        "python",
        "restructuredtext",
        "rust",
        "scss",
        "shellscript",
        "text",
        "typescript",
        "typescriptreact",
        "yml"
    ],
    "[javascript]": {
        "editor.defaultFormatter": "esbenp.prettier-vscode"
    },
    "[json]": {
        "editor.defaultFormatter": "esbenp.prettier-vscode"
    },
    "editor.largeFileOptimizations": false,
    "[jsonc]": {
        "editor.defaultFormatter": "esbenp.prettier-vscode"
    },
    "git.autofetch": true,
    "todo-tree.tree.showScanModeButton": false,
    "javascript.suggest.autoImports": false,
    "typescript.suggest.autoImports": false,
    "[html]": {
        "editor.defaultFormatter": "esbenp.prettier-vscode"
    },
    "search.searchEditor.reusePriorSearchConfiguration": true,
    "search.actionsPosition": "right",
    "editor.minimap.enabled": true
}

There is a project-specific setting.json:

Click me to expand:

{
    "deno.enable": false
}

Please tell me how I can help you guys to fix this problem.

---

As you can see in my project settings I have Deno disabled: "deno.enable": false, yet the problem is present as long as the extension is enabled in VSCode. When I disable it and restart the problem is gone. Clearly it proves that the Deno extension is the culprit.

[lucacasonato]

This has been resolved in version 3.x of the extension.

[oze4]

I can confirm disabling Deno extension resolves this issue.