The id read-only property of the InterventionReportBody interface returns a string identifying the intervention that generated the report. This can be used to group reports.

A string.

In this example we create a new ReportingObserver to observe intervention reports, then print the value of id to the console.

const options = {
  types: ["intervention"],
  buffered: true,
};

const observer = new ReportingObserver((reports, observer) => {
  const firstReport = reports[0];
  console.log(firstReport.type); // intervention
  console.log(firstReport.body.id);
}, options);