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João Soares ca8197ff08 docs: Simplify Deno test task example (#49235 )

Closes #48537 

**Explanation:**
The Deno test task example wasn't appearing because the undefined
ZED_CUSTOM_DENO_TEST_NAME variable made the filter invalid. Instead of
adding a default value, simplify the example to run all tests in the
file, which is the most common use case and works out of the box.


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Screenshots:
Before:
<img width="3434" height="1349" alt="image"
src="https://github.com/user-attachments/assets/bc514103-9b33-489f-a69e-84257ea82acf"
/>

After:
<img width="3438" height="1376" alt="image"
src="https://github.com/user-attachments/assets/47674dde-ede8-4a9d-b365-d2df8e128e18"
/>


Release Notes:

- N/A

2026-02-15 22:22:59 +02:00

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Deno

Deno support is available through the Deno extension.

Language server: Deno Language Server

Deno Configuration

To use the Deno Language Server with TypeScript and TSX files, you will likely wish to disable the default language servers and enable deno by adding the following to your settings.json:

{
  "lsp": {
    "deno": {
      "settings": {
        "deno": {
          "enable": true
        }
      }
    }
  },
  "languages": {
    "JavaScript": {
      "language_servers": [
        "deno",
        "!typescript-language-server",
        "!vtsls",
        "!eslint"
      ],
      "formatter": "language_server"
    },
    "TypeScript": {
      "language_servers": [
        "deno",
        "!typescript-language-server",
        "!vtsls",
        "!eslint"
      ],
      "formatter": "language_server"
    },
    "TSX": {
      "language_servers": [
        "deno",
        "!typescript-language-server",
        "!vtsls",
        "!eslint"
      ],
      "formatter": "language_server"
    }
  }
}

See Configuring supported languages in the Zed documentation for more information.

Configuration completion

To get completions for deno.json or package.json you can add the following to your settings.json: (More info here https://zed.dev/docs/languages/json)

"lsp": {
    "json-language-server": {
      "settings": {
        "json": {
          "schemas": [
            {
              "fileMatch": [
                "deno.json",
                "deno.jsonc"
              ],
              "url": "https://raw.githubusercontent.com/denoland/deno/refs/heads/main/cli/schemas/config-file.v1.json"
            },
            {
              "fileMatch": [
                "package.json"
              ],
              "url": "https://www.schemastore.org/package"
            }
          ]
        }
      }
    }
  }

DAP support

To debug deno programs, add this to .zed/debug.json

[
  {
    "adapter": "JavaScript",
    "label": "Deno",
    "request": "launch",
    "type": "pwa-node",
    "cwd": "$ZED_WORKTREE_ROOT",
    "program": "$ZED_FILE",
    "runtimeExecutable": "deno",
    "runtimeArgs": ["run", "--allow-all", "--inspect-wait"],
    "attachSimplePort": 9229
  }
]

Runnable support

To run deno tasks like tests from the ui, add this to .zed/tasks.json

[
  {
    "label": "deno test",
    "command": "deno test -A '$ZED_FILE'",
    "tags": ["js-test"]
  }
]

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