app.js

var fs = require('fs');
var acorn = require('./node_modules/babel/node_modules/babel-core/lib/acorn');
require('./node_modules/babel/node_modules/babel-core/lib/acorn/plugins/flow.js');

var T = fs.readFileSync('./T.js');

var ast = acorn.parse(T, {
  ecmaVersion: 7,
  sourceType: 'module',
  plugins: {
    flow: true
  },
  features: {
    'es7.asyncFunctions': true
  }
});

console.log(ast);