freeze-class 
About:
Freeze a class and its prototype.
Note: this module is deprecated, please use the object-based module subzero
install:
npm install freeze-class
usage:
'use strict'; const freezeClass = require( 'freeze-class' ); class C { static f() { return 69; } f() { return 22; }} freezeClass( C ); /* the following statements will now return true:*/ // Object.isFrozen( C );// Object.isFrozen( C.prototype ); /* and the following statements will now throw TypeErrors in strict mode:*/ // C.g = function() { return 42 };// C.f = function() { return 42 };// delete C.f;// C.constant = 42;// C.prototype.g = function() { return 42 };// C.prototype.f = function() { return 42 };// delete C.prototype.f;// C.prototype.constant = 42;optional usage:
Deep freeze a class in 'deep' mode. This will not freeze any classes within the class. It works by recursively freezing anything of type "object".
'use strict'; const freezeClass = require( 'freeze-class' ); class C {} class InnerClass {} InnerClass.x = { y: {}}; C.a = { b: { c: { d: { InnerClass } } }}; C.prototype.x = { y: { z: {} }, w: {}}; freezeClass( C, 'deep' ); /* the following statements will now return true:*/ // Object.isFrozen( C );// Object.isFrozen( C.a );// Object.isFrozen( C.a.b );// Object.isFrozen( C.a.b.c );// Object.isFrozen( C.a.b.c.d );// Object.isFrozen( C.prototype );// Object.isFrozen( C.prototype.x );// Object.isFrozen( C.prototype.x.y );// Object.isFrozen( C.prototype.x.y.z );// Object.isFrozen( C.prototype.x.w );// !Object.isFrozen( InnerClass );// !Object.isFrozen( InnerClass.x );// !Object.isFrozen( InnerClass.x.y ); ❄️🎅🏿🎅🏽🎅🏾🎅🏼⛄️🎿🗻🏂
Deep freeze an object in 'deep' mode. This will not freeze any classes within the object. It works by recursively freezing anything of type "object".
'use strict'; const freezeClass = require( 'freeze-class' ); const o = {}; class InnerClass {} InnerClass.x = { y: {}}; o.a = { b: { c: { d: { InnerClass } } }}; o.x = { y: { z: {} }, w: {}}; freezeClass( o, 'deep' ); /* the following statements will now return true:*/ // Object.isFrozen( o );// Object.isFrozen( o.a );// Object.isFrozen( o.a.b );// Object.isFrozen( o.a.b.c );// Object.isFrozen( o.a.b.c.d );// Object.isFrozen( o.x );// Object.isFrozen( o.x.y );// Object.isFrozen( o.x.y.z );// Object.isFrozen( o.x.w );// !Object.isFrozen( InnerClass );// !Object.isFrozen( InnerClass.x );// !Object.isFrozen( InnerClass.x.y );