Can't launch/debug *.cjs files

[AndrewFerr]

Trying to launch a *.cjs file hangs indefinitely, and trying to debug it fails with this error:

Unexpected exception
org.eclipse.lsp4j.jsonrpc.ResponseErrorException: Cannot launch program '{path}'; configuring source maps might help.

That comment about source maps suggests that WWD/lsp4j doesn't realize that *.cjs files are CommonJS modules, which are just JavaScript files with a specific module system, and thus don't need source maps.

A workaround is to simply rename a *.cjs file to *.js, which also proves that there isn't anything inherent about *.cjs files that WWD can't handle.

Maybe this is a lsp4j issue, but the fact that WWD can't even run a *.cjs file at all seems unrelated to language servers, so I filed it here.

[mickaelistria]

Can you please share a minimal project and minimal steps to reproduce?

[AndrewFerr]

All that's needed is a general project with a *.cjs file containing any content at all.

The following project structure is sufficient:

myProject
- .settings
- .project
- index.cjs

where index.cjs is a trivial "Hello World" program.

If it makes a difference, I'm using a system-installed version of node, not the one provided by WWD. Running node index.cjs in a terminal works fine, and so does renaming it to index.js and running it in Eclipse.

[mickaelistria]

I can reproduce the issue. The issue is caused by the vscode-node-debug2 debug adapter that is used by Wild Web Developer. This one doesn't understand *.cjs as being executable/debug-able by default.
There seems to be a possible hack setting __debuggablePatterns in the args params; but I'm afraid this can cause issue later on.