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',
});