nodef · dependabot · Mar 31, 2022 · Mar 31, 2022
diff --git a/package-lock.json b/package-lock.json
diff --git a/package.json b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "extra-string",
-  "version": "2.0.22",
+  "version": "2.0.23",
   "description": "A string is a sequence of characters.",
   "main": "index.js",
   "module": "index.mjs",

diff --git a/src/HEX_DIGITS.ts b/src/HEX_DIGITS.ts
diff --git a/src/LETTERS.ts b/src/LETTERS.ts
diff --git a/src/LOWERCASE.ts b/src/LOWERCASE.ts
diff --git a/src/OCT_DIGITS.ts b/src/OCT_DIGITS.ts
diff --git a/src/PRINTABLE.ts b/src/PRINTABLE.ts
diff --git a/src/PUNCTUATION.ts b/src/PUNCTUATION.ts
diff --git a/src/UPPERCASE.ts b/src/UPPERCASE.ts
diff --git a/src/WHITESPACE.ts b/src/WHITESPACE.ts
diff --git a/src/main.ts b/src/main.ts
@@ -0,0 +1,24 @@
+// CONSTANTS
+// =========
+
+/** Decimal digits 0-9. */
+export const DIGITS: string     = "0123456789";
+/** Octal digits 0-7. */
+export const OCT_DIGITS: string = "01234567";
+/** Hexadecimal digits 0-9, A-F, a-f. */
+export const HEX_DIGITS: string = "0123456789ABCDEFabcdef";
+
+/** English letters A-Z. */
+export const UPPERCASE: string = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+/** English letters a-z. */
+export const LOWERCASE: string = "abcdefghijklmnopqrstuvwxyz";
+/** Combination of uppercase, lowercase. */
+export const LETTERS: string = UPPERCASE + LOWERCASE;
+
+/** Punctuation symbols. */
+export const PUNCTUATION: string = "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~";
+/** The string "\t\n\x0b\x0c\r ". */
+export const WHITESPACE: string  = "\t\n\x0b\x0c\r ";
+
+/** Combination of digits, letters, punctuation, and whitespace. */
+export const PRINTABLE: string = DIGITS + LETTERS + PUNCTUATION + WHITESPACE;