if-else flow in promise (bluebird)

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I think you’re looking for

(conditionA 
  ? fs.writeFileAsync(file, jsonData)
  : Promise.resolve())
.then(functionA);

which is short for

var waitFor;
if (conditionA)
    waitFor = fs.writeFileAsync(file, jsonData);
else
    waitFor = Promise.resolve(undefined); // wait for nothing,
                                          // create fulfilled promise
waitFor.then(function() {
    return functionA();
});

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