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Is It Impossible To Get The [[promisevalue]] From A Promise Object Without Using The Promise Object's Then Method?

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Solution 1:

Not possible in ES7. The value of a promise is stored in the [[PromiseResult]] internal slot:

The value with which the promise has been fulfilled or rejected, if any. Only meaningful if [[PromiseState]] is not "pending".

That slot is only read in the PerformPromiseThen abstract operation, which is only exposed via Promise.prototype.then.

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