import2require (copy to console to execute)

index.js

var test = `
import a from b;
import {a,b} from c;
import a,b,{c,d},{e,f} from c;
import a,{
b,
c,} from d;

alert("hi!");
`;

function import2require(input) {
    let output = "";
    input = input.replace(/import([\s\S]+?)from([\s\S]+?);\n?/gm, function(match, to, from) {
        to = to.replace(/[\n\s]/g, "");
        from = from.replace(/[\n\s]/g, "");
        to = to.replace(/{([\s\S]+?)}/g, function(match, content) {
            output += `const ${match}=require(${from});\n`;

            return "";
        });
        to.split(",").filter(function(part) {
            return part;
        }).forEach(function(part) {
            output += `const ${part}=require(${from});\n`;
        });
        return "";
    });
    return output + input;
}
console.log(import2require(test));