[bug] new toolchain error in offline mode

[sybernatus]

Describe the bug

I have project using node with yarn in my monorepo. I have upgraded moon to the latest version going through the v1.40 and the new toolchain configuration.

old toolchain

$schema: "https://moonrepo.dev/schemas/toolchain.json"
node:
  packageManager: "yarn"
  yarn: {}

new toolchain

$schema: "https://moonrepo.dev/schemas/toolchain.json"
unstable_javascript:
  packageManager: 'yarn'

unstable_node: {}

unstable_yarn: {}

Problem is that I'm in offline mode and while the old toolchain was working without downloading plugins, the new one need to download the wasm plugins so I'm a little bit blocked.

I've also tried to set the environment variable MOON_TOOLCHAIN_FORCE_GLOBALS=true in my pod but it seems not working neither.

Steps to reproduce

1. setup a project with proto

node = "25.2.1"
yarn = "4.12.0"

2. setup the new toolchain

$schema: "https://moonrepo.dev/schemas/toolchain.json"
unstable_javascript:
  packageManager: 'yarn'

unstable_node: {}

unstable_yarn: {}

3. setup a yarn project with a simple task using yarn

tasks:
  install:
    command:
      - "yarn"
      - "install"

4. in CI run the MOON_TOOLCHAIN_FORCE_GLOBALS=true moon ci :install

The CI return the following error:

Error: plugin::loader::failed_download

  × Failed to download plugin from https://github.com/moonrepo/plugins/
  │ releases/download/node_depman_toolchain-v0.2.0/node_depman_toolchain.wasm.
  ├─▶ Failed to make HTTP request for https://github.com/moonrepo/plugins/
  │   releases/download/node_depman_toolchain-v0.2.0/
  │   node_depman_toolchain.wasm.
  ├─▶ error sending request for url (https://github.com/moonrepo/plugins/
  │   releases/download/node_depman_toolchain-v0.2.0/
  │   node_depman_toolchain.wasm)
  ├─▶ client error (Connect)
  ╰─▶ Connection reset by peer (os error 104)

Expected behavior

moon should used the yarn provisioned locally in the container instead of downloading them.

Screenshots

Environment

 moon -V - moon 1.41.7
 proto -V - proto 0.53.2

Additional context

• The CI image is provisioned with moon & proto at build time
• The proto setup is ran during the build image so the image is also already provisioned with node & yarn.

[sybernatus]

Maybe a solution for us could be to not use the toolchain at all but I've tried to remove it and moon was angry because it does not know yarn even if it is installed (using proto independently at build time)

[milesj]

Toolchain requires an internet connection to download the WASM plugins, at least for the first run. After things are downloaded, you can go offline.

You also don't need to use the toolchain, it's optional. You just have to ensure everything you need is on PATH.