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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
There is a proposal for private methods but its not yet standard. However, they are currently supported in chromium browsers and in firefox after enabling a flag. These, however, only work using the class syntax, not in constructor functions like that used in your example.
NOTE:
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Hence, a higher number means a more popular project.