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