💩 Oops, something went wrong: Error: EISDIR: illegal operation on a directory, read

[detj]

Getting this error after installing theo using npm install -g theo. Tried it using node v6.14.4, node 8.12.0, node 9.11.2, node 10.11.0.

$ theo --version
💩  Oops, something went wrong: Error: EISDIR: illegal operation on a directory, read

update
I did some digging around. Turns out, the cli expects a source file as its first argument always. When that's not provided, like in case of theo --version(this command doesn't exist, I now learned) it converts an undefined value to '' and then to process.cwd(). Throws this error when it tries to run a file operation on a directory.