@gvray/eskit/lib/constantize.js

A rich and colorful toolkit about typescript and javascript.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Freezes an object and its immediate properties (shallow freeze).
 * 冻结对象及其直接属性（浅冻结）。
 *
 * @param obj - The object to freeze / 要冻结的对象
 *
 * @example
 * ```typescript
 * const config = {
 *   api: { url: 'https://api.example.com', timeout: 5000 },
 *   features: ['auth', 'logging'],
 *   debug: true
 * }
 *
 * constantize(config)
 *
 * // Object and its immediate properties are frozen
 * config.debug = false // TypeError: Cannot assign to read only property
 * config.newProp = 'value' // TypeError: Cannot add property
 * config.api.timeout = 10000 // TypeError: Cannot assign to read only property
 *
 * // But nested objects' properties can still be modified
 * // (this is a shallow freeze, not deep freeze)
 *
 * // Check if frozen
 * console.log(Object.isFrozen(config)) // true
 * console.log(Object.isFrozen(config.api)) // true
 * console.log(Object.isFrozen(config.features)) // true
 *
 * // Useful for creating immutable configuration objects
 * const constants = { PI: 3.14159, E: 2.71828 }
 * constantize(constants)
 * // constants.PI = 3.14 // TypeError: Cannot assign to read only property
 * ```
 *
 * @since 1.0.0
 */
var constantize = function (obj) {
    Object.freeze(obj);
    Object.keys(obj).forEach(function (key) {
        var val = obj[key];
        if (typeof val === 'object' && val !== null) {
            Object.freeze(val);
        }
    });
};
exports.default = constantize;
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