I had node version 10 installed in my system, after upgrading my npm from version 6 to version 7 I couldn't install the dependencies, and I'm getting error so I had to downgrade my node to 6, (both npm ci and npm i was failing) And the project I was testing is this:

https://github.com/Giveth/feathers-giveth

the errors were something like this:

npm ERR! code 128
npm ERR! git dep preparation failed
npm ERR! command /Users/username/.nvm/versions/node/v10.23.0/bin/node /Users/username/.nvm/versions/node/v10.23.0/lib/node_modules/npm/bin/npm-cli.js install --force --cache=/Users/username/.npm/_cacache --prefer-offline=false --prefer-online=false --offline=false --no-progress --no-save --no-audit
npm ERR! npm WARN using --force Recommended protections disabled.
npm ERR! npm ERR! code 128
npm ERR! npm ERR! command failed
npm ERR! npm ERR! command git clone --mirror -q ssh://git@github.com/gulpjs/gulp.git /Users/renjer/.npm/_cacache/_cacache/tmp/git-clone-dfb83c15/.git
npm ERR! npm ERR! fatal: destination path '/Users/username/.npm/_cacache/_cacache/tmp/git-clone-dfb83c15/.git' already exists and is not an empty directory.
npm ERR!
npm ERR! npm ERR! A complete log of this run can be found in:
npm ERR! npm ERR!     /Users/username/.npm/_cacache/_logs/2021-02-18T16_18_35_855Z-debug.log

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/username/.npm/_logs/2021-02-18T16_20_15_536Z-debug.log