Converts System.import to a synchronous require call. For NodeJS

system-import-sync-plugin.js

const template = require("babel-template");

module.exports = function SystemImportPlugin() {
  return {
    visitor: {
      CallExpression(path) {
        const callee = path.get("callee");
        if (!callee.isMemberExpression()) return;

        const object = callee.get("object");
        const property = callee.get("property");

        if (!object.isIdentifier() || !property.isIdentifier()) return;
        if (object.node.name !== "System" || property.node.name !== "import") return;

        const build = template(`
          ({
            then(cb) {
              cb(require(SOURCE));
            }
          })
        `);
        const replacement = build({
          SOURCE: path.node.arguments[0]
        }).expression;

        path.replaceWith(replacement);
      }
    }
  }
}