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Would you be interested in taking a look at my thoughts for the future of clap? I'm wanting to make sure I don't lose what people find awesome about it now but make the right compromises to allow it to work better in more cases.
fig.io rewrote their CLI in rust, they also mentioned on twitter they use clap. Looks like cross-platform was their biggest motivation.
There are frameworks like oclif which take care of all that for you. It includes nodejs in the installation packages that it creates for each platform. It's pretty seamless. Nodejs can start up in a few hundredths of a second, but in practice startup time is going to depend a lot on what your cli does.
A11yWatch has the CLI in rust too https://github.com/A11yWatch/a11ywatch.