index.js

'use strict';

function capitalizeFirstLetter(string) {
  return string.charAt(0).toUpperCase() + string.slice(1);
}

function AwsCloudwatchMetricsReport(opts) {
  this.file = opts.file || 'metric_data.json';
}

AwsCloudwatchMetricsReport.prototype.onStart = function (root, context) {
  this.contentWriter = context.writer.writeFile(this.file);
  var summary = root.getCoverageSummary();
  var metrics = [];
  var timestamp = new Date();

  for (var dimension in summary.data) {
    for (var metricType in summary.data[dimension]) {
      var metric = {
        MetricName: capitalizeFirstLetter(metricType),
        Dimensions: [
          {
            Name: 'Coverage',
            Value: capitalizeFirstLetter(dimension),
          },
        ],
        Timestamp: timestamp,
        Unit: metricType === 'pct' ? 'Percent' : 'Count',
        Value: summary[dimension][metricType],
      };
      metrics.push(metric);
    }
  }

  this.contentWriter.write(JSON.stringify(metrics));
  this.contentWriter.close();
};

module.exports = AwsCloudwatchMetricsReport;