This has happened to me each time I setup a new Debian or Ubuntu environment. Firstly, the yarn command I am referring to here is the JavaScript “Yarn” package manager. The yarn that was installed or already installed was the one used by the cmdtest. I thought I had yarn installed when I checked using the command which yarn and out printed /usr/bin/yarn. $ which yarn /usr/bin/yarn When I ran yarn upgrade I got this weird error message: ~/src/a-javascript-project $…
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