@babel/plugin-transform-instanceof

    1. function _instanceof(left, right) {
    2.     right != null &&
    3.     typeof Symbol !== "undefined" &&
    4.     right[Symbol.hasInstance]
    6.     return right[Symbol.hasInstance](left);
    7.   } else {
    8.     return left instanceof right;
    9.   }
    11. _instanceof(foo, Bar);
    1. {
    2.   "plugins": ["@babel/plugin-transform-instanceof"]
    3. }
    1. require("@babel/core").transformSync("code", {
    3. });