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try {
  fs = require('graceful-fs')
} catch (err) {
  fs = require('fs')
}

yield fs.rename(src, dest);

TypeError: You may only yield a function, promise, generator, array, or object, but the following object was passed: "undefined"
      at next (/home/jpetitcolas/dev/xxx/node_modules/koa/node_modules/co/index.js:101:25)
      at onFulfilled (/home/jpetitcolas/dev/xxx/node_modules/koa/node_modules/co/index.js:69:7)

fs.js:77
      throw err;  // Forgot a callback but don't know where? Use NODE_DEBUG=fs
            ^
Error: EXDEV, rename '/tmp/lazg2qxdek4kj4i/file.png'

Error: fs.lchown does not exist

var cofsTest = function * () {

  console.log("Unknown file", yield fs.exists('random.file'));
  console.log("this file", yield * fs.exists(__filename));

  return true;
};
var generator = cofsTest();
var genResult;

while (!(genResult = generator.next(genResult && genResult.value)).done);
console.log("Test", genResult.value);

Unknown file function (done){
    fs.stat(path, function(err, res){
      done(null, !err);
    });
  }
this file function (done){
    fs.stat(path, function(err, res){
      done(null, !err);
    });
  }
Test true

Unknown file false
this file true
Test true

var filenames = yield fs.walk('/opt/boxen'); // returns an array of filenames.