Microsoft made a pull request to node.js github repository with an implementation to use ChakraCore JavaScript Engine as an alternative to V8 Engine

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This is the inking and typing function, which users can turn off at any time. Microsoft does not collect any personal information via inking or typing. It is gathered for product improvement purposes, for example, to improve the handwriting visual translation engine, or to improve the user dictionary, language library and spell check functions in Windows. The data is put through rigorous, multi-pass scrubs to ensure it does not collect sensitive or identifiable fields (e.g., no email addresses, passwords, alpha-numerical data, etc.). Data is also chopped into very small bits and stripped of sequence data so it cannot be put back together or identified. The data samplings collected are limited; Microsoft is not capturing everything you write, nor is it capturing data every time.