firebase login fails running under WSL

[REQUIRED] Environment info

firebase-tools: 7.2.0

Platform: debian over WSL1

[REQUIRED] Test case

firebase login fails when running under WSL.

[REQUIRED] Steps to reproduce

• install WSL (Debian)
• install node 12.7.0
• install firebase-tools using npm
• run firebase login

[REQUIRED] Expected behavior

Expected to listen on local port.

[REQUIRED] Actual behavior

$ firebase login --debug

[2019-07-25T03:53:52.524Z] ----------------------------------------------------------------------
[2019-07-25T03:53:52.532Z] Command:       /usr/bin/node /usr/bin/firebase login --debug
[2019-07-25T03:53:52.532Z] CLI Version:   7.2.0
[2019-07-25T03:53:52.533Z] Platform:      linux
[2019-07-25T03:53:52.535Z] Node Version:  v12.7.0
[2019-07-25T03:53:53.767Z] Time:          Thu Jul 25 2019 13:53:52 GMT+1000 (GMT+10:00)
[2019-07-25T03:53:53.768Z] ----------------------------------------------------------------------

? Allow Firebase to collect anonymous CLI usage and error reporting information? Yes

Visit this URL on any device to log in:
(omitted)

Waiting for authentication...
[2019-07-25T03:53:55.869Z] Error: spawn cmd.exe ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:264:19)
    at onErrorNT (internal/child_process.js:456:16)
    at processTicksAndRejections (internal/process/task_queues.js:77:11)

Error: An unexpected error has occurred.

firebase-tools attempts to spawn cmd.exe, which doesn’t exist. If I were to guess, it thinks it’s running under Windows.

[Galzk]

Try this if you face the same issue PATH="$PATH:/mnt/c/Windows/System32" firebase login

[shaneqld]

Taking a further look into this, it seems open package invokes cmd.exe which it expects is on the PATH environment variable. Adding /mnt/c/Windows/system32 to PATH resolves the problem.