babel-plugin-tcomb broken

The babel-plugin-tcomb Babel plugin does not function correctly with Meteor core package ecmascript after version 0.6.1.

Setup

$ cd /path/to/app
$ meteor npm install
$ meteor

Background

We use flow, tcomb, and babel-plugin-tcomb for static and runtime type-checking, respectively. In this example project, the echo function in main.js should only be passed foo1 or foo2, as described by FooType in FooType.js. The second call to echo passes an illegal argument, bar1 and we expect a tcomb generated TypeError.

Details

In this example project, the ecmascript packages is pinned to 0.6.1. Under this version, the following code is generated for the FooType.js module.

module.export({
    FooType: function () {
        return FooType
    }
});

var _t; module.import('tcomb', {
    "default": function (v) { _t = v }
});

var FooType = _t.enums.of(['foo1', 'foo2'], 'FooType');

This code correctly exports tcomb's type checker for FooType and the misuse of the echo function in main.js is correctly detected:

TypeError: [tcomb] Invalid value "bar1" supplied to foo: FooType (expected one of [
  "foo1",
  "foo2"
])

Updating the ecmascript package to version 0.6.2 creates the following code:

import _t from "tcomb";

var FooType = _t.enums.of(["foo1", "foo2"], "FooType");

Which causes a syntax error:

import _t from "tcomb";
^^^^^^

SyntaxError: Unexpected reserved word
    at Object.exports.runInThisContext (vm.js:53:16)

Adding babel-plugin-transform-es2015-modules-commonjs doesn't help:

$ meteor npm install --save-dev babel-plugin-transform-es2015-modules-commonjs

$ cat .babelrc
{
  "plugins": [
    "tcomb",
    "transform-es2015-modules-commonjs"
  ]
}

FooType is not exported:

"use strict";
var _tcomb = require("tcomb");
var _tcomb2 = _interopRequireDefault(_tcomb);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
var FooType = _tcomb2.default.enums.of(["foo1", "foo2"], "FooType");

Question

Is there a fix for this issue or are we stuck with ecmascript@=0.6.1 (and therefore release 1.4.2.7)?

Thanks,

Peter.