memory issue #612

I'm running my app in a low resource environment. After a few calls to JavaScriptObfuscator.obfuscate my nodejs app runs out of memory.
Each obfuscation increases the heap by ~10mb and never gets garbage collected.

var app = require('express')();
var JavaScriptObfuscator = require('javascript-obfuscator');
.....
app.use(async function (req, res, next) {
if (path.basename(req.url) == 'somefile.js') {
var file = fs.readFileSync('somefile.js', 'ascii');
var obfuscationResult = JavaScriptObfuscator.obfuscate(file, {
compact: true,
controlFlowFlattening: true,
controlFlowFlatteningThreshold: 0.75,
deadCodeInjection: true,
deadCodeInjectionThreshold: 0.4,
debugProtection: false,
debugProtectionInterval: false,
disableConsoleOutput: true,
identifierNamesGenerator: 'mangled',
log: false,
renameGlobals: false,
rotateStringArray: true,
selfDefending: true,
shuffleStringArray: true,
splitStrings: true,
splitStringsChunkLength: 2,
stringArray: true,
stringArrayEncoding: 'base64',
stringArrayThreshold: 0.75,
transformObjectKeys: true,
unicodeEscapeSequence: false
});
res.end(obfuscationResult.getObfuscatedCode());
}
next();
}