Unable to install theia dependencies

[varadekd]

Bug Description: I am trying to install all the dependencies for the theia editor but I am not able to download it.

Steps to Reproduce:

1. Create a dir name theiaEditor
2. Go to the theiaEditor
3. add package.json from here https://theia-ide.org/docs/composing_applications/
4. run yarn in your terminal

Error

warning monaco-languageclient@0.13.0: The engine "vscode" appears to be invalid.
warning vscode-languageclient@6.1.3: The engine "vscode" appears to be invalid.
error find-git-exec@0.0.2: The engine "node" is incompatible with this module. Expected version ">=10.11.0 <12". Got "12.18.1"
error Found incompatible module.
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.

Additional Information

• Operating System: Mac OS catalina 10.15.5
• Node Version: 12.8.1

[vince-fugnitto]

@varadekd the error message is quite clear, you attempted to install with an unsupported node version:

Expected version ">=10.11.0 <12". Got "12.18.1"

Additional Info:

• Installation failed with LTS Node version12.16.1 #7349

[vince-fugnitto]

You can also reference the prerequisites.

[Unifex]

I was having this issue today also. Old version of node led me here.

The Prerequisites no longer work. There is a reference to the Active LTS for NodeJS. You need to use the v12 Maintenance LTS instead.

Looking at the release history at the time @vince-fugnitto made their comment v12 would have been the Active LTS.

[vince-fugnitto]

@Unifex thank you for the discussion, what exact issue were you having and at what version of the framework?

[DayronDLR]

In the prerequisites they said this... however, yarn doesn't work in the Theia package even complying with the prerequisites.

Now, when I use nvm 11, the error is this...

[vince-fugnitto]

@DayronDLR what version of @theia are you attempting to build? If you try the latest or build master it should definitely work, I haven't seen Node 11 used for quite some time. It may also be that you need to upgrade your yarn.lock if you haven't already done so.