This is template for a KRunner plugin written in JavaScript which uses the DBus API.
Additionally it has npm commands to build a standalone executable (~43 mb) and an executable with all the npm dependencies but without NodeJS (~240 kb).

For more information and the advantages of DBus visit: http://blog.davidedmundson.co.uk/blog/cross-process-runners/

The implementation of the DBus interface is inspired by https://github.com/opl-/plasma-runner-js-eval