feat(core): Introduce native implementations for Base64, random generation and normalization; remove runtime plugin dependencies; update tests, docs and package metadata

ts/smartstring.create.ts

@@ -1,5 +1,63 @@
 import * as plugins from './smartstring.plugins.js';
 
+/**
+ * Cross-platform random number generator
+ * Uses crypto.getRandomValues in browser and Math.random as fallback
+ */
+const getRandomInt = (min: number, max: number): number => {
+  if (typeof globalThis !== 'undefined' && globalThis.crypto && globalThis.crypto.getRandomValues) {
+    // Browser environment with crypto API
+    const range = max - min;
+    const array = new Uint32Array(1);
+    globalThis.crypto.getRandomValues(array);
+    return min + (array[0] % range);
+  } else {
+    // Fallback to Math.random for environments without crypto
+    return Math.floor(Math.random() * (max - min)) + min;
+  }
+};
+
+/**
+ * Custom implementation of randomatic pattern-based string generator
+ * Pattern characters:
+ * A - Uppercase letter
+ * a - Lowercase letter  
+ * 0 - Number (0-9)
+ * ! - Special character
+ * * - Any character (A, a, 0, or !)
+ */
+const customRandomatic = (pattern: string, length?: number, options?: any): string => {
+  const charSets = {
+    'A': 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
+    'a': 'abcdefghijklmnopqrstuvwxyz',
+    '0': '0123456789',
+    '!': '!@#$%^&*()_+-=[]{}|;:,.<>?',
+    '*': 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*()_+-=[]{}|;:,.<>?'
+  };
+
+  // If length is provided, repeat the pattern to match length
+  let actualPattern = pattern;
+  if (length && length > pattern.length) {
+    actualPattern = pattern.repeat(Math.ceil(length / pattern.length)).slice(0, length);
+  } else if (length) {
+    actualPattern = pattern.slice(0, length);
+  }
+
+  let result = '';
+  for (const char of actualPattern) {
+    if (charSets[char]) {
+      const charSet = charSets[char];
+      const randomIndex = getRandomInt(0, charSet.length);
+      result += charSet[randomIndex];
+    } else {
+      // If not a pattern character, use it literally
+      result += char;
+    }
+  }
+
+  return result;
+};
+
 /**
  * creates a random string
  *
@@ -17,7 +75,7 @@ export const createRandomString = (
   lengthArg?: number,
   optionsArg?: any
 ): string => {
-  return plugins.randomatic(patternArg, lengthArg, optionsArg);
+  return customRandomatic(patternArg, lengthArg, optionsArg);
 };
 
 /**