@geronimus/deep-freeze

deepFreeze( obj )

Recursively freezes an object, and all objects referenced in that object's properties. (And so on...)

Examples

const deepFreeze = require( "@geronimus/deep-freeze" );

const box = {
  height: 20,
  width: 30,
  colour: {
    name: "sea red",
    rgb: {
      red: 244,
      green: 112,
      blue: 112
    }
  }
};

const returnValue = deepFreeze( box );

// The object is frozen in place, as well as returned.
returnValue === box; // => true

// You can no longer mess with any of its properties,
// no matter how deeply nested.
box.height = 10;
box.colour.name = "smokey pink";
box.colour.rgb.red = 255;

box.height; // => 20
box.colour.name; // => "sea red"
box.colour.rgb.red; // => 244

Object.isFrozen( box.colour.rgb ); // => true

Parameters

obj object

The object you wish to deeply freeze. It will be frozen in place, as well as returned. (No element of it is not copied.)

Returns

object

The same object that gets passed in as obj, recursively frozen.