package.json : who is the target of "main:umd": "dist/umd/bundl.js" ? which tool can use it? is it a standard name for umd?

Question

package json of popper.js contains

"main:umd": "dist/umd/popper.js"

I am interesting to understand is this a standard way to instruct modern bundlers|tools (which of them?) or just the popper specific?

Is it a standard naming? Can I use "main:esm" with those tools?

I can't find anything about "main:umd" in google.