It's the other way around. Files with those names and extensions are expected to have specific formats. If associated tools popularity amongst developers is is what you mean, then I don't have statistics about that. If GitHub stars of these tools are to be considered, then it would be (at the time of writing): - .babelrc -> [24,702](/babel/babel) - .editorconfig -> [1,259](/editorconfig/editorconfig) - Pipfile -> [6,272](/pypa/pipenv) - Pipfile.lock -> [6,272](/pypa/pipenv) - *.toml -> [6,737](/toml-lang/toml) - *.vue -> [76,938](/vuejs/vue)
IMHO, if a file is expected to have specific format, it can safely be added to default format list. It improves user experience too, btw.