I've got a blank cpp module (just empty main and no libraries are included) 
compiled as a "main module":

em++ dummy.cc -o dummy.js -s MODULARIZE=1 -s INCLUDE_FULL_LIBRARY=0 -s 
WASM=1 -s ASSERTIONS=0 -s ALLOW_MEMORY_GROWTH=1 -s TOTAL_MEMORY=1MB -s 
TOTAL_STACK=128KB -std=c++11 -s MAIN_MODULE=1

This module is loaded by node 

console.log(process.memoryUsage())
Module = require('./dummy');
Module({}).then((m) => {
console.log(process.memoryUsage())
});

Memory usage of node itself (as shown by activity monitor) is 7MB. With the 
above module loaded it becomes almost 40MB. Is this expected? Is there any 
way to decrease the amount of using memory?

 
Btw, the output is:
{ rss: 19574784,
  heapTotal: 6062080,
  heapUsed: 3663952,
  external: 8272 }

{ rss: 47509504,
  heapTotal: 19042304,
  heapUsed: 15156120,
  external: 3422273 }

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