Small utility for deeply freezing objects in JavaScript.

• Installation
• Documentation
• Code of Conduct
• Contributing
• License

npm

npm install freezly

yarn

yarn add freezly

This project literally exports a single function which is used to deeply freeze any Javascript object. All nested arrays and objects become frozen, ensuring the entire object can't be mutated. This is primarily useful in functional programming, if you want to guarantee an object passed into a function isn't mutated by said function. However in practice deeply freezing objects comes with some amount of a performance cost so it is recommended to only deep freeze objects in a development environment and/or tests.

Below is an example of how to use freezly.

import deepFreeze from 'freezly'

const frozenObject = deepFreeze({
  foo: ['bar'],
})

// The following will throw an error as you can't mutate frozen objects
frozenObject.baz = 'spam' // Can't add properties to frozen object
frozenObject.foo.push('baz') // Can't push items to frozen array

Note: Once you freeze an object any attempts to mutate any part of the object will result in an error being thrown.

Please see the code of conduct.

Please see the contributing guide.

MIT