Node v8.getCppHeapStatistics function | API Reference

It returns an object with a structure similar to the cppgc::HeapStatistics object. See the V8 documentation for more information about the properties of the object.

// Detailed
({
  committed_size_bytes: 131072,
  resident_size_bytes: 131072,
  used_size_bytes: 152,
  space_statistics: [
    {
      name: 'NormalPageSpace0',
      committed_size_bytes: 0,
      resident_size_bytes: 0,
      used_size_bytes: 0,
      page_stats: [{}],
      free_list_stats: {},
    },
    {
      name: 'NormalPageSpace1',
      committed_size_bytes: 131072,
      resident_size_bytes: 131072,
      used_size_bytes: 152,
      page_stats: [{}],
      free_list_stats: {},
    },
    {
      name: 'NormalPageSpace2',
      committed_size_bytes: 0,
      resident_size_bytes: 0,
      used_size_bytes: 0,
      page_stats: [{}],
      free_list_stats: {},
    },
    {
      name: 'NormalPageSpace3',
      committed_size_bytes: 0,
      resident_size_bytes: 0,
      used_size_bytes: 0,
      page_stats: [{}],
      free_list_stats: {},
    },
    {
      name: 'LargePageSpace',
      committed_size_bytes: 0,
      resident_size_bytes: 0,
      used_size_bytes: 0,
      page_stats: [{}],
      free_list_stats: {},
    },
  ],
  type_names: [],
  detail_level: 'detailed',
});

// Brief
({
  committed_size_bytes: 131072,
  resident_size_bytes: 131072,
  used_size_bytes: 128864,
  space_statistics: [],
  type_names: [],
  detail_level: 'brief',
});