index.js

var map = require("./map.json");
var meteorAliases = {};

Object.keys(map).forEach(function (id) {
  if (typeof map[id] === "string") {
    var aliasParts = module.id.split("/");
    aliasParts.pop();
    aliasParts.push("node_modules", map[id]);
    exports[id] = meteorAliases[id + ".js"] = meteorAliases["node:" + id] =
      aliasParts.join("/");
  } else {
    exports[id] = map[id];
    meteorAliases[id + ".js"] = meteorAliases["node:" + id] = function(){};
  }
});

if (typeof meteorInstall === "function") {
  meteorInstall({
    // Install the aliases into a node_modules directory one level up from
    // the root directory, so that they do not clutter the namespace
    // available to apps and packages.
    "..": {
      node_modules: meteorAliases
    }
  });
}

// If Buffer is not defined globally, but the "buffer" built-in stub is
// installed and can be imported, use it to define global.Buffer so that
// modules like core-util-is/lib/util.js can refer to Buffer without
// crashing application startup.
if (typeof global.Buffer !== "function") {
  try {
    // Use (0, require)(...) to avoid registering a dependency on the
    // "buffer" stub, in case it is not otherwise bundled.
    global.Buffer = (0, require)("buffer").Buffer;
  } catch (ok) {
    // Failure to import "buffer" is fine as long as the Buffer global
    // variable is not used.
  }
}