npm install on a system without yarn installed fails
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! serviceworker-webpack-plugin@1.0.0 postinstall: `(cd ./test/webpack3; yarn install)`
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the serviceworker-webpack-plugin@1.0.0 postinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
Bug Report or Feature Request (mark with an
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Repro steps.
npm install
on a system without yarn installed fails