# js

Run function() on each event. If the function returns a truthy value, it is emitted downstream. Please read these notes for details on arrow functions and this.

# Config

Required:

function: Function to apply to events.

# Example

pipeline:
  not-aggregated:
    module: js
    config:
      function: !!js/function >-
        function(event) {
          if (event._agg === undefined) {
            return event
          }
        }