@babel/plugin-transform-regenerator

    1. var _marked = [a].map(regeneratorRuntime.mark);
    3. function a() {
    4.     function a$(_context) {
    5.       while (1) {
    6.         switch ((_context.prev = _context.next)) {
    8.             _context.next = 2;
    9.             return 1;
    11.           case 2:
    12.           case "end":
    13.         }
    15.     },
    16.     _marked[0],
    17.     this
    18.   );
    19. }
    1. {
    2.   "plugins": ["@babel/plugin-transform-regenerator"]
    1. babel --plugins @babel/plugin-transform-regenerator script.js