babel/packages/babel-plugin-transform-es5-property-mutators/src/index.js

import * as defineMap from "babel-helper-define-map";

export default function ({ types: t }) {
  return {
    visitor: {
        ObjectExpression(path, file) {
          let{ node } = path;
          let hasAny = false;
          for (let prop of (node.properties: Array)) {
            if (prop.kind === "get" || prop.kind === "set") {
              hasAny = true;
              break;
            }
          }
          if (!hasAny) return;

          let mutatorMap = {};

          node.properties = node.properties.filter(function (prop) {
            if (!prop.computed && (prop.kind === "get" || prop.kind === "set")) {
              defineMap.push(mutatorMap, prop, null, file);
              return false;
            } else {
              return true;
            }
          });

          path.replaceWith(t.callExpression(
            t.memberExpression(t.identifier("Object"), t.identifier("defineProperties")),
            [node, defineMap.toDefineObject(mutatorMap)]
          ));
        }
    }
  };
}