Issue:
You need a different version of npm than what is pre-installed on the Bitrise stacks.
Possible solutions:
You can use npm itself to install a new version. Add a Script Step to your Workflow with the npm install command. In our example, we're installing npm version 7.4.0.
#!/usr/bin/env bash set -exnpm install -g npm@7.4.0 # installs NPM v7.4.0