diff --git a/bin/smartypants.cjs b/bin/smartypants.cjs
new file mode 100755
index 0000000..2be0cca
--- /dev/null
+++ b/bin/smartypants.cjs
@@ -0,0 +1,39 @@
+#! /usr/bin/env node
+
+const binary = "smartypants";
+const mode = process.argv[2] || "1";
+
+if (mode == "-h" || mode == "--help") {
+  process.stdout.write(`Usage: ${binary} [mode]
+
+Available modes:
+
+  0     Suppress all transformations. (Do nothing.)
+  1     Performs default SmartyPants transformations: quotes (including backticks-style), em-dashes, and ellipses. -- (dash dash) is used to signify an em-dash; there is no support for en-dashes.
+  2     Same as 1, except that it uses the old-school typewriter shorthand for dashes: -- (dash dash) for en-dashes, --- (dash dash dash) for em-dashes.
+  3     Same 2, but inverts the shorthand for dashes: -- (dash dash) for em-dashes, and --- (dash dash dash) for en-dashes.
+  -1    Stupefy mode. Reverses the SmartyPants transformation process, turning the HTML entities produced by SmartyPants into their ASCII equivalents. E.g. “ is turned into a simple double-quote ("), — is turned into two dashes, etc. This is useful if you are using SmartyPants from Brad Choate's MT-Textile text filter, but wish to suppress smart punctuation in specific MT templates, such as RSS feeds. Text filters do their work before templates are processed; but you can use smarty_pants="-1" to reverse the transformations in specific templates.
+  `);
+  process.exit(0);
+}
+
+if (process.stdin.isTTY) {
+  console.error("No input!");
+  process.exit(1);
+}
+
+let smartypants = require("../smartypants.cjs").smartypants;
+let text = "";
+
+process.stdin.setEncoding("utf8");
+
+process.stdin.on("readable", () => {
+  let chunk = process.stdin.read();
+  if (chunk !== null) {
+    text = text + chunk;
+  }
+});
+
+process.stdin.on("end", () => {
+  process.stdout.write(smartypants(text, mode));
+});
diff --git a/bin/smartypants.js b/bin/smartypants.js
deleted file mode 100755
index 7c7bd77..0000000
--- a/bin/smartypants.js
+++ /dev/null
@@ -1,24 +0,0 @@
-#! /usr/bin/env node
-
-if (process.stdin.isTTY) {
-  console.error('No input!');
-  process.exit(1);
-}
-
-var smartypants = require('..').smartypants;
-
-var text = '';
-
-process.stdin.setEncoding('utf8');
-
-process.stdin.on('readable', () => {
-  var chunk = process.stdin.read();
-  if (chunk !== null) {
-    text = text + chunk;
-  }
-});
-
-process.stdin.on('end', () => {
-  process.stdout.write(smartypants(text, '1'));
-});
-
diff --git a/bin/smartypantsu.cjs b/bin/smartypantsu.cjs
new file mode 100755
index 0000000..532eb92
--- /dev/null
+++ b/bin/smartypantsu.cjs
@@ -0,0 +1,39 @@
+#! /usr/bin/env node
+
+const binary = "smartypantsu";
+const mode = process.argv[2] || "1";
+
+if (mode == "-h" || mode == "--help") {
+  process.stdout.write(`Usage: ${binary} [mode]
+
+Available modes:
+
+  0     Suppress all transformations. (Do nothing.)
+  1     Performs default SmartyPants transformations: quotes (including backticks-style), em-dashes, and ellipses. -- (dash dash) is used to signify an em-dash; there is no support for en-dashes.
+  2     Same as 1, except that it uses the old-school typewriter shorthand for dashes: -- (dash dash) for en-dashes, --- (dash dash dash) for em-dashes.
+  3     Same 2, but inverts the shorthand for dashes: -- (dash dash) for em-dashes, and --- (dash dash dash) for en-dashes.
+  -1    Stupefy mode. Reverses the SmartyPants transformation process, turning the HTML entities produced by SmartyPants into their ASCII equivalents. E.g. “ is turned into a simple double-quote ("), — is turned into two dashes, etc. This is useful if you are using SmartyPants from Brad Choate's MT-Textile text filter, but wish to suppress smart punctuation in specific MT templates, such as RSS feeds. Text filters do their work before templates are processed; but you can use smarty_pants="-1" to reverse the transformations in specific templates.
+  `);
+  process.exit(0);
+}
+
+if (process.stdin.isTTY) {
+  console.error("No input!");
+  process.exit(1);
+}
+
+let smartypants = require("../smartypants.cjs").smartypantsu;
+let text = "";
+
+process.stdin.setEncoding("utf8");
+
+process.stdin.on("readable", () => {
+  let chunk = process.stdin.read();
+  if (chunk !== null) {
+    text = text + chunk;
+  }
+});
+
+process.stdin.on("end", () => {
+  process.stdout.write(smartypants(text, mode));
+});
diff --git a/bin/smartypantsu.js b/bin/smartypantsu.js
deleted file mode 100755
index 22db5d7..0000000
--- a/bin/smartypantsu.js
+++ /dev/null
@@ -1,24 +0,0 @@
-#! /usr/bin/env node
-
-if (process.stdin.isTTY) {
-  console.error('No input!');
-  process.exit(1);
-}
-
-var smartypants = require('..').smartypantsu;
-
-var text = '';
-
-process.stdin.setEncoding('utf8');
-
-process.stdin.on('readable', () => {
-  var chunk = process.stdin.read();
-  if (chunk !== null) {
-    text = text + chunk;
-  }
-});
-
-process.stdin.on('end', () => {
-  process.stdout.write(smartypants(text, '1'));
-});
-
diff --git a/package.json b/package.json
index d5b5977..bfaf666 100644
--- a/package.json
+++ b/package.json
@@ -40,8 +40,8 @@
     "bin/smartypantsu.js"
   ],
   "bin": {
-    "smartypants": "./bin/smartypants.js",
-    "smartypantsu": "./bin/smartypantsu.js"
+    "smartypants": "./bin/smartypants.cjs",
+    "smartypantsu": "./bin/smartypantsu.cjs"
   },
   "devDependencies": {
     "babel-eslint": "^9.0.0",
@@ -55,4 +55,4 @@
     "typescript": "^3.0.3",
     "uglify-js": "3.9.4"
   }
-}
+}
\ No newline at end of file
diff --git a/smartypants.cjs b/smartypants.cjs
index f7873d7..164ef98 100644
--- a/smartypants.cjs
+++ b/smartypants.cjs
@@ -33,7 +33,7 @@
   "use strict";
   exports.__esModule = true;
   exports.smartypantsu = exports.smartellipses = exports.smartdashes = exports.smartquotes = exports.smartypants = void 0;
-  var tags_to_skip = /<(\/?)(?:pre|code|kbd|script|math)[^>]*>/i;
+  var tags_to_skip = /<(\/?)(?:pre|code|kbd|script|style|math)[^>]*>/i;
   /**
    * @param text text to be parsed
    * @param attr value of the smart_quotes="" attribute
diff --git a/smartypants.es6.js b/smartypants.es6.js
index caebce0..e92f725 100644
--- a/smartypants.es6.js
+++ b/smartypants.es6.js
@@ -1,4 +1,4 @@
-const tags_to_skip = /<(\/?)(?:pre|code|kbd|script|math)[^>]*>/i;
+const tags_to_skip = /<(\/?)(?:pre|code|kbd|script|style|math)[^>]*>/i;
 /**
  * @param text text to be parsed
  * @param attr value of the smart_quotes="" attribute
diff --git a/smartypants.js b/smartypants.js
index f7873d7..164ef98 100644
--- a/smartypants.js
+++ b/smartypants.js
@@ -33,7 +33,7 @@
   "use strict";
   exports.__esModule = true;
   exports.smartypantsu = exports.smartellipses = exports.smartdashes = exports.smartquotes = exports.smartypants = void 0;
-  var tags_to_skip = /<(\/?)(?:pre|code|kbd|script|math)[^>]*>/i;
+  var tags_to_skip = /<(\/?)(?:pre|code|kbd|script|style|math)[^>]*>/i;
   /**
    * @param text text to be parsed
    * @param attr value of the smart_quotes="" attribute
diff --git a/smartypants.mjs b/smartypants.mjs
index caebce0..e92f725 100644
--- a/smartypants.mjs
+++ b/smartypants.mjs
@@ -1,4 +1,4 @@
-const tags_to_skip = /<(\/?)(?:pre|code|kbd|script|math)[^>]*>/i;
+const tags_to_skip = /<(\/?)(?:pre|code|kbd|script|style|math)[^>]*>/i;
 /**
  * @param text text to be parsed
  * @param attr value of the smart_quotes="" attribute
diff --git a/smartypants.ts b/smartypants.ts
index d618c76..3ad5a2a 100644
--- a/smartypants.ts
+++ b/smartypants.ts
@@ -1,6 +1,6 @@
 type token = [string, string];
 
-const tags_to_skip = /<(\/?)(?:pre|code|kbd|script|math)[^>]*>/i;
+const tags_to_skip = /<(\/?)(?:pre|code|kbd|script|style|math)[^>]*>/i;
 
 
 /**