Example.cs

using UnityEditor;
using UnityEditor.Build.Reporting;

public class Example
{
    [MenuItem( "Tools/Hoge" )]
    private static void Hoge()
    {
        var latestReport = BuildReport.GetLatestReport();

        var files             = latestReport.GetFiles();
        var steps             = latestReport.steps;
        var summary           = latestReport.summary;
        var strippingInfo     = latestReport.strippingInfo;
        var packedAssets      = latestReport.packedAssets;
        var scenesUsingAssets = latestReport.scenesUsingAssets;
        var errorSummary      = latestReport.SummarizeErrors();
    }
}