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Most of our highchart config is located in config.es6. Except for the config.es6, we also add or change some config settings in the highchart.es6 part. Mostly it's populating series, adding the xAxis config, and doing some changes based on the datasource and/or graphType. There is also some functions being added and minor changes done in the highchartsDataFormats.es6 frontend script. The reason for the split is because it's difficult to send functions in the config from the backend part to the frontend init function, and because some config options depends on knowing the client screen size.
Highchart can use two different datasources, TBML or JSONStat, see their respective documentation for more info.