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A stream that enables asynchronous enrichment of data with concurrency control while preserving FIFO ordering.


  • Enrichment is asynchronous.
  • Concurrency is controlled via async.queue.
  • Stream writes are buffered until enrichment has completed.

v1.0.0 Release Notes

v1.0.0 Breaking change: constructor parameters are re-ordered and 'shouldEnrichFunc' is now optional.

Use Cases

Given that enrichment likely takes time which requires buffering the current best use cases are where enrichment is expected to be relatively fast. Use a control stream or other mechanism to tune performance as a pre/post step.

Running Tests

Run node test to send a stream of values for enrichment that are checked for being output in order.

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