Thanks for the clarifications. I was under the impression that Rust required a lot of tough infrastructure.
I'm glad to see that ripgrep lets you define your own types. That ripgrep does it with globbing vs. the ways that ack allows is just another of the differences between the tools that people have to decide about.
You can define your own file types with ripgrep on the command line (albeit not in a config file, so you end up needing a wrapper script or an alias).
ripgrep has pre-compiled binaries that work out of the box on Windows, Mac and Linux.
"Rust runtime" isn't really a thing. It's like you saying you don't want to deal with a C runtime.