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Promise.noConflict 

Promise.noConflict() -> Object

This is relevant to browser environments with no module loader.

Release control of the Promise namespace to whatever it was before this library was loaded. Returns a reference to the library namespace so you can attach it to something else.

<!-- the other promise library must be loaded first -->
<script type="text/javascript" src="/scripts/other_promise.js"></script>
<script type="text/javascript" src="/scripts/bluebird_debug.js"></script>
<script type="text/javascript">
//Release control right after
var Bluebird = Promise.noConflict();

//Cast a promise from some other Promise library using the Promise namespace to Bluebird:
var promise = Bluebird.resolve(new Promise());
</script>