# webapp-hashing
[Source code of released version](https://github.com/meteor/meteor/tree/master/packages/webapp-hashing) | [Source code of development version](https://github.com/meteor/meteor/tree/devel/packages/webapp-hashing)
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This package knows how to hash together all of the elements in a
client resource manifest to produce a build ID that can be used to
determine if a client has the latest code, or if it needs to be
updated. It is used internally by
[webapp](https://atmospherejs.com/meteor/webapp).
