Which Version of Node.js Does VS Code Use to Run Extensions?

The version of your language runtime matters. We've previously run into bugs with function signatures changing in patch versions of Node and character encoding breaking in minor versions of Node

When we built our language server and VS Code extension we wanted to determine the version of Node.js that VS Code uses to run extensions.

Looking at the VS Code Source

VS Code sets the version of Node in an .nvmrc file in their repository.

https://github.com/microsoft/vscode/blob/main/.nvmrc

The version is specified in a few other places in the repository, but it appears that they're all kept in sync.

We made sure we tested our VS Code extension against the exact same version.

We considered whether to test against older versions as well, but decided to only test against the version used by the latest release.

Following VS Code Updates

Of course, we also want to make sure we continue to follow the version when it changes. We decided to track it by using the cron feature of RWX.

We configured our cron failures to post into a Slack channel, so if the version ever changes, we'll see the failed run and can bump the version.

In the RWX run definition we:

Look up the latest tag of VS Code
Fetch the .nvmrc file from that tag
Clone our language server repository
Use the rwx/tool-versions package to look up the node version
Compare the VS Code version of Node with the version we're using

.rwx/cron-node-version.yml

1on:
2  cron:
3    - key: check-node-version
4      schedule: "0 7 * * 1 America/New_York"
5      init:
6        ref: ${{ event.git.sha }}
7
8base:
9  os: ubuntu 24.04
10  tag: 1.1
11
12tasks:
13  - key: get-latest-vscode
14    cache: false
15    run: |
16      LATEST_TAG=$(curl -s https://api.github.com/repos/microsoft/vscode/releases/latest | jq -r .tag_name)
17      echo "Latest tag is $LATEST_TAG"
18      echo "$LATEST_TAG" > $RWX_VALUES/latest-tag
19
20  - key: get-latest-version
21    run: |
22      NVMRC_URL="https://raw.githubusercontent.com/microsoft/vscode/${LATEST_VSCODE_TAG}/.nvmrc"
23      NODE_VERSION=$(curl -s "$NVMRC_URL")
24
25      echo "Latest VS Code release: $LATEST_VSCODE_TAG"
26      echo "Node.js version from .nvmrc: $NODE_VERSION"
27      echo "$NODE_VERSION" > $RWX_VALUES/node-version
28    env:
29      LATEST_VSCODE_TAG: ${{ tasks.get-latest-vscode.values.latest-tag }}
30
31  - key: code
32    call: git/clone 1.6.7
33    with:
34      repository: https://github.com/rwx-cloud/language-server.git
35      github-access-token: ${{ github['rwx-cloud'].token }}
36      ref: ${{ init.ref }}
37
38  - key: tool-versions
39    use: [code]
40    call: rwx/tool-versions 1.0.4
41
42  - key: compare-version
43    run: |
44      echo "VS Code Node version: $VSCODE_NODE_VERSION"
45      echo "Project Node version: $PROJECT_NODE_VERSION"
46      test "$VSCODE_NODE_VERSION" = "$PROJECT_NODE_VERSION"
47    env:
48      VSCODE_NODE_VERSION: ${{ tasks.get-latest-version.values.node-version }}
49      PROJECT_NODE_VERSION: ${{ tasks.tool-versions.values.nodejs }}

Run Results

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