SharedStorageRunOperation

// reach-measurement-worklet.js
const SCALE_FACTOR = 65536;

function convertContentIdToBucket(contentId) {
  return BigInt(contentId);
}

class ReachMeasurementOperation {
  async run(data) {
    const { contentId } = data;

    // Read from Shared Storage
    const key = "has-reported-content";
    const hasReportedContent = (await this.sharedStorage.get(key)) === "true";

    // Do not report if a report has been sent already
    if (hasReportedContent) {
      return;
    }

    // Generate the aggregation key and the aggregatable value
    const bucket = convertContentIdToBucket(contentId);
    const value = 1 * SCALE_FACTOR;

    // Send an aggregatable report via the Private Aggregation API
    privateAggregation.sendHistogramReport({ bucket, value });

    // Set the report submission status flag
    await this.sharedStorage.set(key, true);
  }
}

// Register the operation
register("reach-measurement", ReachMeasurementOperation);

async function measureUniqueReach() {
  // Load the Shared Storage worklet
  await window.sharedStorage.worklet.addModule("reach-measurement-worklet.js");

  // Run the reach measurement operation
  await window.sharedStorage.run("reach-measurement", {
    data: { contentId: "1234" },
  });
}

measureUniqueReach();