Mysterious failure to install cordova plugins

My builds have mysteriously started failing because my cordova plugins are not getting installed. This is what the installation logs look like for each plugin:

(node:4558) [DEP0128] DeprecationWarning: Invalid ‘main’ field in ‘/Users/vagrant/git/node_modules/objectorarray/package.json’ of ‘dist/index.js’. Please either fix that or report it to the module author

(Use node --trace-deprecation ... to show where the warning was created)

No scripts found for hook “before_plugin_add”.

Calling plugman.fetch on plugin “GitHub - CodeWithOz/cordova-plugin-googlemaps: Google Maps plugin for Cordova

fetch: Installing GitHub - CodeWithOz/cordova-plugin-googlemaps: Google Maps plugin for Cordova to /Users/vagrant/git

Running command: npm install GitHub - CodeWithOz/cordova-plugin-googlemaps: Google Maps plugin for Cordova --production --save-exact

Command finished with error code 0: npm install,GitHub - CodeWithOz/cordova-plugin-googlemaps: Google Maps plugin for Cordova

Failed to fetch plugin GitHub - CodeWithOz/cordova-plugin-googlemaps: Google Maps plugin for Cordova via registry.

Probably this is either a connection problem, or plugin spec is incorrect.

Check your connection and plugin name/version/URL.

Could not determine package name from output:

added 3 packages, and audited 588 packages in 14s

The last build that worked was almost exactly 2 days ago from now, and I didn’t change anything in the build process. Did something change on bitrise, like the default nodejs version or something else?