Rewrite typeof module/exports

[Rich-Harris]

Ref rollup/rollup#1061. If this plugin rewrote typeof module, typeof exports and typeof module.exports inside a createCommonjsModule wrapper as 'object', then a lot of UMD checks could be simplified:

if (typeof exports === "object" && typeof module === "object") {
  module.exports = foo;
} else if (typeof define === "function" && define.amd) {
  define([], function () { return foo; });
} else {
  window.foo = foo;
}

...becomes this...

if ('object' === "object" && 'object' === "object") {
  module.exports = foo;
} else if (typeof define === "function" && define.amd) {
  define([], function () { return foo; });
} else {
  window.foo = foo;
}

...which becomes this:

{
  module.exports = foo;
}