@tanzanite/deep-lock/dist/index.js

Deep freeze, seal or preventExtensions typescript helper function

// types from https://github.com/krzkaczor/ts-essentials
export function deepLock(obj, options) {
    const { action = 'freeze' } = options ?? {};
    if (!['freeze', 'seal', 'preventExtensions', 'preventExtensions'].includes(action)) {
        throw new TypeError(`Invalid action: ${action}`);
    }
    return lock(obj, action);
}
function lock(obj, action, locked = new Set()) {
    if (locked.has(obj))
        return obj; // Prevent circular reference
    // @ts-ignore incompatible type signatures
    Object[action](obj);
    locked.add(obj);
    // In strict mode obj.caller and obj.arguments are non-deletable properties which throw when set or retrieved
    if (obj === Function.prototype)
        return obj;
    const keys = Object.getOwnPropertyNames(obj);
    keys.push(...Object.getOwnPropertySymbols(obj));
    keys.forEach((prop) => {
        if (Object.hasOwnProperty.call(obj, prop) &&
            obj[prop] !== null &&
            (typeof obj[prop] === 'object' || typeof obj[prop] === 'function') &&
            !ArrayBuffer.isView(obj[prop])) {
            lock(obj[prop], action, locked);
        }
    });
    return obj;
}
export default deepLock;
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