This module helps dispose of an object gracefully when the Node.js process exits.
It executes a function with a given parameter
on 'exit' without leaking memory,
cleaning things up appropriately if the object is garbage collected.
Requires WeakRef and FinalizationRegistry, i.e. use Node v14 .
npm i on-exit-leak-free'use strict'
const { register, unregister } = require('on-exit-leak-free')
const assert = require('assert')
function setup () {
// This object can be safely garbage collected,
// and the resulting shutdown function will not be called.
// There are no leaks.
const obj = { foo: 'bar' }
register(obj, shutdown)
// use registerBeforeExit(obj, shutdown) to execute the function only
// on beforeExit
// call unregister(obj) to remove
}
let shutdownCalled = false
// Please make sure that the function passed to register()
// does not create a closure around unnecessary objects.
function shutdown (obj, eventName) {
console.log(eventName) // beforeExit
shutdownCalled = true
assert.strictEqual(obj.foo, 'bar')
}
setup()
process.on('exit', function () {
assert.strictEqual(shutdownCalled, true)
})MIT