mcard-js/dist/utils/environmentDetector.js

A JavaScript implementation of MCard - A data model for persistently storing content with cryptographic hashing and timestamping

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.setGlobalProperty = exports.isServiceWorker = exports.isNode = exports.isBrowser = exports.getTextEncoder = exports.getGlobalScope = exports.getGlobalProperty = void 0;
/**
 * Environment detection utility for cross-environment compatibility
 */

// Check if running in a browser environment
const isBrowser = exports.isBrowser = typeof window !== 'undefined';

// Check if running in a Node.js environment
const isNode = exports.isNode = typeof process !== 'undefined' && process.versions != null && process.versions.node != null;

// Check for service worker environment
const isServiceWorker = exports.isServiceWorker = typeof self === 'object' && self.constructor && self.constructor.name === 'ServiceWorkerGlobalScope';

/**
 * Get a safe reference to global scope that works across environments
 * @returns The global scope object (window, global, self)
 */
const getGlobalScope = () => {
  if (typeof window !== 'undefined') return window;
  if (typeof global !== 'undefined') return global;
  if (typeof self !== 'undefined') return self;
  return {};
};

/**
 * Safely access a property on the global scope
 * @param {string} propertyName - The name of the property to access
 * @returns The property value or undefined if not available
 */
exports.getGlobalScope = getGlobalScope;
const getGlobalProperty = propertyName => {
  const globalScope = getGlobalScope();
  return globalScope[propertyName];
};

/**
 * Safely set a property on the global scope
 * @param {string} propertyName - The name of the property to set
 * @param {any} value - The value to set
 */
exports.getGlobalProperty = getGlobalProperty;
const setGlobalProperty = (propertyName, value) => {
  const globalScope = getGlobalScope();
  globalScope[propertyName] = value;
};

/**
 * Get an environment-appropriate text encoder
 * @returns A TextEncoder instance or polyfill
 */
exports.setGlobalProperty = setGlobalProperty;
const getTextEncoder = () => {
  // Browser environment
  if (typeof window !== 'undefined' && window.TextEncoder) {
    return new window.TextEncoder();
  }

  // Node.js environment
  if (typeof TextEncoder !== 'undefined') {
    return new TextEncoder();
  }

  // Fallback implementation
  return {
    encode: str => {
      const utf8 = [];
      for (let i = 0; i < str.length; i++) {
        let charCode = str.charCodeAt(i);
        if (charCode < 0x80) {
          utf8.push(charCode);
        } else if (charCode < 0x800) {
          utf8.push(0xc0 | charCode >> 6, 0x80 | charCode & 0x3f);
        } else if (charCode < 0xd800 || charCode >= 0xe000) {
          utf8.push(0xe0 | charCode >> 12, 0x80 | charCode >> 6 & 0x3f, 0x80 | charCode & 0x3f);
        } else {
          // Handle surrogate pairs
          i++;
          charCode = 0x10000 + ((charCode & 0x3ff) << 10 | str.charCodeAt(i) & 0x3ff);
          utf8.push(0xf0 | charCode >> 18, 0x80 | charCode >> 12 & 0x3f, 0x80 | charCode >> 6 & 0x3f, 0x80 | charCode & 0x3f);
        }
      }
      return new Uint8Array(utf8);
    }
  };
};
exports.getTextEncoder = getTextEncoder;
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