cannot install labextension

[AshtonSBradley]

The bug

WebIO not detected in jupyterlab. Installs fine for regular notebook.

Context

julia> WebIO.install_jupyter_labextension(WebIO.find_jupyter_cmd(),force_conda_jupyter=true)
An error occured.
ValueError: No linked package for @webio/webio
See the log file for details:  /var/folders/zw/s31fj38120b91ttt4kzfy4240000gn/T/jupyterlab-debug-ho7uo346.log
An error occured.
ValueError: Please install nodejs 5+ and npm before continuing installation. nodejs may be installed using conda or directly from the nodejs website.
See the log file for details:  /var/folders/zw/s31fj38120b91ttt4kzfy4240000gn/T/jupyterlab-debug-fm5rxo82.log
An error occured.
ValueError: Please install nodejs 5+ and npm before continuing installation. nodejs may be installed using conda or directly from the nodejs website.
See the log file for details:  /var/folders/zw/s31fj38120b91ttt4kzfy4240000gn/T/jupyterlab-debug-xuhpjzo_.log
ERROR: failed process: Process(`/Users/brian/.julia/conda/3/bin/jupyter labextension install --no-build @webio/[email protected]`, ProcessExited(1)) [1]
Stacktrace:
 [1] pipeline_error at ./process.jl:525 [inlined]
 [2] #run#565(::Bool, ::typeof(run), ::Cmd) at ./process.jl:440
 [3] run at ./process.jl:438 [inlined]
 [4] #install_jupyter_labextension#66(::Bool, ::Bool, ::typeof(WebIO.install_jupyter_labextension), ::Cmd) at /Users/brian/.julia/packages/WebIO/2mZPb/deps/jupyter.jl:159
 [5] (::WebIO.var"#kw##install_jupyter_labextension")(::NamedTuple{(:force_conda_jupyter,),Tuple{Bool}}, ::typeof(WebIO.install_jupyter_labextension), ::Cmd) at ./none:0
 [6] top-level scope at REPL[3]:1

with

julia> versioninfo()
Julia Version 1.3.0
Commit 46ce4d7933 (2019-11-26 06:09 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin19.0.0)
  CPU: Intel(R) Core(TM) i5-8210Y CPU @ 1.60GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-6.0.1 (ORCJIT, skylake)

Pkg.status("WebIO")
    Status `~/.julia/environments/v1.3/Project.toml`
  [0f1e0344] WebIO v0.8.11

[AshtonSBradley]

I tried Conda.add("nodejs") and rebuilding WebIO. The error persists.

[twavv]

I can reproduce this.

The solution is to add Conda's bin directory to the PATH environment variable.