old_contents: "use strict";
  
  const execa = require("execa");
  const ipRegex = require("ip-regex");
  
  const gwArgs = "path Win32_NetworkAdapterConfiguration where IPEnabled=true get DefaultIPGateway,Index /format:table".split(" ");
  const ifArgs = "path Win32_NetworkAdapter get Index,NetConnectionID /format:table".split(" ");
  
  const parse = (gwTable, ifTable, family) => {
    let gateway, gwid, result;
  
    (gwTable || "").trim().split("\n").splice(1).some(line => {
      const results = line.trim().split(/} +/) || [];
      const gw = results[0];
      const id = results[1];
      gateway = (ipRegex[family]().exec((gw || "").trim()) || [])[0];
      if (gateway) {
        gwid = id;
        return true;
      }
    });
  
    (ifTable || "").trim().split("\n").splice(1).some(line => {
      const i = line.indexOf(" ");
      const id = line.substr(0, i).trim();
      const name = line.substr(i + 1).trim();
      if (id === gwid) {
        result = {gateway: gateway, interface: name ? name : null};
        return true;
      }
    });
  
    if (!result) {
      throw new Error("Unable to determine default gateway");
    }
  
    return result;
  };
  
  const promise = family => {
    return Promise.all([
      execa.stdout("wmic", gwArgs),
      execa.stdout("wmic", ifArgs),
    ]).then(results => {
      const gwTable = results[0];
      const ifTable = results[1];
  
      return parse(gwTable, ifTable, family);
    });
  };
  
  const sync = family => {
    const gwTable = execa.sync("wmic", gwArgs);
    const ifTable = execa.sync("wmic", ifArgs);
  
    return parse(gwTable, ifTable, family);
  };
  
  module.exports.v4 = () => promise("v4");
  module.exports.v6 = () => promise("v6");
  
  module.exports.v4.sync = () => sync("v4");
  module.exports.v6.sync = () => sync("v6");
  
new_contents: "use strict";
  
  const execa = require("execa");
  const ipRegex = require("ip-regex");
  
  const gwArgs = "path Win32_NetworkAdapterConfiguration where IPEnabled=true get DefaultIPGateway,Index /format:table".split(" ");
  const ifArgs = "path Win32_NetworkAdapter get Index,NetConnectionID /format:table".split(" ");
  
  const parse = (gwTable, ifTable, family) => {
    let gateway, gwid, result;
  
    (gwTable || "").trim().split("\n").splice(1).some(line => {
      const results = line.trim().split(/} +/) || [];
      const gw = results[0];
      const id = results[1];
      gateway = (ipRegex[family]().exec((gw || "").trim()) || [])[0];
      if (gateway) {
        gwid = id;
        return true;
      }
    });
  
    (ifTable || "").trim().split("\n").splice(1).some(line => {
      const i = line.indexOf(" ");
      const id = line.substr(0, i).trim();
      const name = line.substr(i + 1).trim();
      if (id === gwid) {
        result = {gateway: gateway, interface: name ? name : null};
        return true;
      }
    });
  
    if (!result) {
      throw new Error("Unable to determine default gateway");
    }
  
    return result;
  };
  
  const promise = family => {
    return Promise.all([
      execa.stdout("wmic", gwArgs),
      execa.stdout("wmic", ifArgs),
    ]).then(results => {
      const gwTable = results[0];
      const ifTable = results[1];
  
      return parse(gwTable, ifTable, family);
    });
  };
  
  const sync = family => {
    const gwTable = execa.sync("wmic", gwArgs).stdout;
    const ifTable = execa.sync("wmic", ifArgs).stdout;
  
    return parse(gwTable, ifTable, family);
  };
  
  module.exports.v4 = () => promise("v4");
  module.exports.v6 = () => promise("v6");
  
  module.exports.v4.sync = () => sync("v4");
  module.exports.v6.sync = () => sync("v6");
  
subject: fix sync methods on Windows