feat(package): random string/int utility functions

package/shared/index.ts

@@ -38,3 +38,53 @@ export async function waitFor<T>(cb: () => T, errMessage: string | void, timeout
 
   return p;
 }
+
+export function getRandomInt(min = 0, max = 9) {
+  if (min > max) [min, max] = [max, min];
+
+  return Math.floor(Math.random() * (max - min + 1)) + min;
+}
+
+export function getRandomChar(lowercase?: boolean) {
+  const str = String.fromCharCode(getRandomInt(65, 90));
+  return lowercase ? str.toLowerCase() : str;
+}
+
+export function getRandomAlphanumeric(lowercase?: boolean) {
+  return Math.random() > 0.5 ? getRandomChar(lowercase) : getRandomInt();
+}
+
+const formatChar: Record<string, (...args: any) => string | number> = {
+  '1': getRandomInt,
+  A: getRandomChar,
+  '.': getRandomAlphanumeric,
+  a: getRandomChar,
+};
+
+export function getRandomString(pattern: string, length?: number): string {
+  const len = length || pattern.replace(/\^/g, '').length;
+  const arr: Array<string | number> = Array(len).fill(0);
+  let size = 0;
+  let i = 0;
+
+  while (size < len) {
+    i += 1;
+    let char: string | number = pattern.charAt(i - 1);
+
+    if (char === '') {
+      arr[size] = ' '.repeat(len - size);
+      break;
+    } else if (char === '^') {
+      i += 1;
+      char = pattern.charAt(i - 1);
+    } else {
+      const fn = formatChar[char];
+      char = fn ? fn(char === 'a') : char;
+    }
+
+    size += 1;
+    arr[size - 1] = char;
+  }
+
+  return arr.join('');
+}