interface Deno.MemoryUsage Properties rss: number The number of bytes of the current Deno's process resident set size, which is the amount of memory occupied in main memory (RAM). heapTotal: number The total size of the heap for V8, in bytes. heapUsed: number The amount of the heap used for V8, in bytes. external: number Memory, in bytes, associated with JavaScript objects outside of the JavaScript isolate.