How to use the @babel/preset-env/data/built-ins.json function in @babel/preset-env
To help you get started, we’ve selected a few @babel/preset-env examples, based on popular ways it is used in public projects.
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babel / babel / packages / babel-polyfill / scripts / make-separate-polyfill-files.js View on Github 
"use strict";
const fs = require("fs");
const path = require("path");
function relative(loc) {
return path.join(__dirname, "..", loc);
}
const builtIns = require("@babel/preset-env/data/built-ins.json");
const polyfills = Object.keys(builtIns);
polyfills
.concat(["web.timers", "web.immediate", "web.dom.iterable"])
.forEach(polyfill => {
fs.writeFileSync(
relative(`src/core-js/modules/${polyfill}.js`),
`require("core-js/modules/${polyfill}");`
);
});
fs.writeFileSync(
relative("src/regenerator-runtime/runtime.js"),
'require("regenerator-runtime/runtime");'
);@babel/preset-env
A Babel preset for each environment.
