The multiScan operator for RxJS
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rxjs-multi-scan is a microlibrary for RxJS. It adds a single operator,
multiScan, which combines multiple observable sources into a single scan
operation.
For each observable source, a separate reducer function is applied whenever a value is emitted.
This makes it easy to capture user interaction and other forms of I/O in subjects and observables and combine them into a single state container without the need for a full state management library.