@eklabdev/blingts4/dist/decorators/class/immutable.js

A comprehensive TypeScript decorators library implementing Stage 2 decorators for TS 4.9+

/**
 * Makes all properties of a class read-only
 */
export function Immutable() {
    return function (target) {
        // Create a subclass that extends the original class
        return class extends target {
            constructor(...args) {
                super(...args);
                // Make all properties read-only
                Object.keys(this).forEach(key => {
                    Object.defineProperty(this, key, {
                        writable: false,
                        configurable: false,
                    });
                });
                // Prevent adding new properties
                Object.preventExtensions(this);
            }
        };
    };
}