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Usage
import * as observablesWithStreams from"https://raw.githubusercontent.com/surma/observables-with-streams/28c55be6d855780c677fd1f4ba975f4d3144891d/src/sources/external.ts";
Utility function to create new observables from external sources.
Returns an object with two values: the new observable, and a next function
which will emit a value to observable when called.
Calling next with EOF will indicate there are no more values to emit.