An example application to demonstrate a small buffer/closure leak from zlib

zlib-buffer-closure-leak.js

const memwatch = require('memwatch-next');
const _ = require('lodash');
const zlib = require('./lib/zlib');

function writeLeakDiff(diff) {
    const closures = _.filter(diff.change.details, {what: 'Closure'});
    console.log('Closure changes', closures);

    const buffers = _.filter(diff.change.details, {what: 'Uint8Array'});
    console.log('Uint8Array changes', buffers);
}



var before = new memwatch.HeapDiff();

var deflator = zlib.createDeflateRaw();

var done = new Promise( (resolve) => {
    const input = '.................................';
    deflator.write(input);
    deflator.flush( () => {
        resolve();
    });
});

done.then( () => {
    setImmediate( () => {
        var diff = before.end();
        writeLeakDiff(diff);
    });
});