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/**
* Given an array of promise creators, executes them in a sequence.
*
* If any of the promises in the chain fails, all subsequent promises
* will be skipped
*
* Returns the value last promise from a sequence resolved
*/
module.exports = function promiseWaterfall(tasks) {
return tasks.reduce(
(prevTaskPromise, task) => prevTaskPromise.then(task),
Promise.resolve()
);
};