Statsig Sidecar

Statsig sidecar helps marketing teams build and run experiments without needing to write or modify code.

You can register a pre-init experiment callback through window.statsigSidecarConfig:

window.statsigSidecarConfig = {
  onExperimentEvaluation: function (event) {
    // event.name === "experiment_evaluation"
    // event.experiment is the Statsig experiment instance
  },
};

Unlike window.postExperimentCallback, onExperimentEvaluation fires once per Sidecar experiment evaluation, including experiments activated later through prerun scripts via StatsigSidecar.activateExperiment(...).