diff --git a/.travis.yml b/.travis.yml
index c611965..a14f7b8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 language: node_js
 node_js:
-  - 4
-  - 6
-sudo: false
+  - 12
+  - 14
+  - 16
+cache: npm
diff --git a/README.md b/README.md
index c5f457f..1e5ecd7 100644
--- a/README.md
+++ b/README.md
@@ -49,17 +49,17 @@ It acts in the same way as the original cowsay, so consult `cowsay(1)` or run `c
 ## Usage as a module
 
 cowsay can be used as any other npm dependency
+```js
+var cowsay = require("cowsay");
 
-    var cowsay = require("cowsay");
-
-    console.log(cowsay.say({
-    	text : "I'm a moooodule",
-    	e : "oO",
-    	T : "U "
-    }));
-
-    // or cowsay.think()
+console.log(cowsay.say({
+    text : "I'm a moooodule",
+    e : "oO",
+    T : "U "
+}));
 
+// or cowsay.think()
+```
 ````
  _________________
 ( I'm a moooodule )
@@ -71,6 +71,57 @@ cowsay can be used as any other npm dependency
                 ||     ||
 ````
 
+getting a list of cow names:
+```js
+function get_cows(error, cow_names) {
+    if (error) {
+        console.log(error)
+    }
+    else if (cow_names) {
+        console.log(`Number of cows available: ${cow_names.length}`);
+    }
+}
+
+cowsay.list(get_cows);
+```
+
+#### Typescript examples:
+```ts
+import * as cowsay from "cowsay"
+
+let output: string = cowsay.say({ text: 'Hello from typescript!' });
+
+console.log(output);
+```
+
+getting a list of cow names:
+```ts
+function get_cows(error: NodeJS.ErrnoException, cow_names: Array<string>): void {
+    if (error) {
+        console.log(`Error getting cow names: ${error.message}`)
+    }
+    else if (cow_names) {
+        console.log(`Number of cows available: ${cow_names.length}`);
+    }
+}
+
+cowsay.list(get_cows);
+```
+
+importing the `IOptions` interface directly:
+```ts
+import { IOptions } from "cowsay" // optional
+
+let opts: IOptions = {
+    text: "Hello from TypeScript!",
+    e: '^^',
+    r: true,
+};
+
+console.log(cowsay.say(opts));
+```
+
+
 ## Pipe from standard input
 
     echo please repeat | cowsay
diff --git a/browser.js b/browser.js
index 729275b..185367a 100644
--- a/browser.js
+++ b/browser.js
@@ -1,4 +1,4 @@
-import baloon from "./lib/balloon";
+import balloon from "./lib/balloon";
 import replacer from "./lib/replacer";
 import faces from "./lib/faces";
 
@@ -195,7 +195,7 @@ export { default as YASUNA_20 } from '.cows/yasuna_20.cow';
 export { default as YMD_UDON } from '.cows/ymd_udon.cow';
 export { default as ZEN_NOH_MILK } from '.cows/zen-noh-milk.cow';
 
-function converToCliOptions(browserOptions) {
+function convertToCliOptions(browserOptions) {
   const cliOptions = {
     e: browserOptions.eyes || 'oo',
     T: browserOptions.tongue || '  ',
@@ -218,13 +218,13 @@ function doIt (options, sayAloud) {
 	face.thoughts = sayAloud ? "\\" : "o";
 
 	const action = sayAloud ? "say" : "think";
-	return baloon[action](options.text || options._.join(" "), options.n ? null : options.W) + "\n" + replacer(cow, face);
+	return balloon[action](options.text || options._.join(" "), options.n ? null : options.W) + "\n" + replacer(cow, face);
 }
 
 export function say(browserOptions) {
-  return doIt(converToCliOptions(browserOptions), true);
+  return doIt(convertToCliOptions(browserOptions), true);
 }
 
 export function think(browserOptions) {
-  return doIt(converToCliOptions(browserOptions), false);
+  return doIt(convertToCliOptions(browserOptions), false);
 }
diff --git a/cli.js b/cli.js
index e573138..60f6e1c 100755
--- a/cli.js
+++ b/cli.js
@@ -1,75 +1,83 @@
 #!/usr/bin/env node
-var argv = require("optimist")
-.usage("Usage: $0 [-e eye_string] [-f cowfile] [-h] [-l] [-n] [-T tongue_string] [-W column] [-bdgpstwy] text\n\n" +
-	"If any command-line arguments are left over after all switches have been processed, they become the cow's message.\n\n" +
-	"If the program is invoked as cowthink then the cow will think its message instead of saying it.")
-.options({
-	"e" : {
-		default : "oo"
-	},
-	"T" : {
-		default : "  "
-	},
-	"W" : {
-		default : 40
-	},
-	"f" : {
-		default : "default"
-	}
-})
-.describe({
-	"b" : "Mode: Borg",
-	"d" : "Mode: Dead",
-	"g" : "Mode: Greedy",
-	"p" : "Mode: Paranoia",
-	"s" : "Mode: Stoned",
-	"t" : "Mode: Tired",
-	"w" : "Mode: Wired",
-	"y" : "Mode: Youthful",
-	"e" : "Select the appearance of the cow's eyes.",
-	"T" : "The tongue is configurable similarly to the eyes through -T and tongue_string.",
-	"h" : "Display this help message",
-	"n" : "If it is specified, the given message will not be word-wrapped.",
-	"W" : "Specifies roughly where the message should be wrapped. The default is equivalent to -W 40 i.e. wrap words at or before the 40th column.",
-	"f" : "Specifies a cow picture file (''cowfile'') to use. It can be either a path to a cow file or the name of one of cows included in the package.",
-	"r" : "Select a random cow",
-	"l" : "List all cowfiles included in this package."
-})
-.boolean(["b", "d", "g", "p", "s", "t", "w", "y", "n", "h", "r", "l"])
-.argv;
+const yargs = require('yargs')
+	.usage(`
+Usage: $0 [-e eye_string] [-f cowfile] [-h] [-l] [-n] [-T tongue_string] [-W column] [-bdgpstwy] text
+		
+If any command-line arguments are left over after all switches have been processed, they become the cow's message.
+		
+If the program is invoked as cowthink then the cow will think its message instead of saying it.
+`)
+  .options({
+    e: {
+      default: 'oo',
+    },
+    T: {
+      default: '  ',
+    },
+    W: {
+      default: 40,
+      type: 'number',
+    },
+    f: {
+      default: 'default',
+    },
+    think: {
+      type: 'boolean',
+    },
+  })
+  .describe({
+    b: 'Mode: Borg',
+    d: 'Mode: Dead',
+    g: 'Mode: Greedy',
+    p: 'Mode: Paranoia',
+    s: 'Mode: Stoned',
+    t: 'Mode: Tired',
+    w: 'Mode: Wired',
+    y: 'Mode: Youthful',
+    e: "Select the appearance of the cow's eyes.",
+    T:
+      'The tongue is configurable similarly to the eyes through -T and tongue_string.',
+    h: 'Display this help message',
+    n: 'If it is specified, the given message will not be word-wrapped.',
+    W:
+      'Specifies roughly where the message should be wrapped. The default is equivalent to -W 40 i.e. wrap words at or before the 40th column.',
+    f:
+      "Specifies a cow picture file (''cowfile'') to use. It can be either a path to a cow file or the name of one of cows included in the package.",
+    r: 'Select a random cow',
+    l: 'List all cowfiles included in this package.',
+    think: 'Think the message instead of saying it aloud.',
+  })
+  .boolean(['b', 'd', 'g', 'p', 's', 't', 'w', 'y', 'n', 'h', 'r', 'l'])
+  .help()
+  .alias('h', 'help');
+
+const argv = yargs.argv;
 
 if (argv.l) {
-	listCows();
-} else if (argv.h) {
-	showHelp();
+  listCows();
 } else if (argv._.length) {
-	say();
+  say();
 } else {
-	require("get-stdin")().then(function (data) {
-		if (data) {
-			argv._ = [require("strip-eof")(data)];
-			say();
-		} else {
-			showHelp();
-		}
-	});
+  require('get-stdin')().then((data) => {
+    if (data) {
+      argv._ = [require('strip-final-newline')(data)];
+      say();
+    } else {
+      yargs.showHelp();
+    }
+  });
 }
 
-function say () {
-	var module = require("./index");
-
-	var think = /think$/.test(argv["$0"]);
-
-	console.log(think ? module.think(argv) : module.say(argv));
-}
+function say() {
+  const module = require('./index');
+  const think = /think$/.test(argv['$0']) || argv.think;
 
-function listCows () {
-	require("./index").list(function(err, list) {
-		if (err) throw new Error(err);
-		console.log(list.join("  "));
-	});
+  console.log(think ? module.think(argv) : module.say(argv));
 }
 
-function showHelp () {
-	require("optimist").showHelp();
+function listCows() {
+  require('./index').list((err, list) => {
+    if (err) throw new Error(err);
+    console.log(list.join('  '));
+  });
 }
diff --git a/cows/USA.cow b/cows/USA.cow
index d70c4ad..17bbeb0 100644
--- a/cows/USA.cow
+++ b/cows/USA.cow
@@ -10,7 +10,7 @@ $the_cow = <<EOC;
   |* * * * * * * * * * OOOOOOOOOOOOOOOOOOOOOOOOO|
   | * * * * * * * * *  :::::::::::::::::::::::::|
   |* * * * * * * * * * OOOOOOOOOOOOOOOOOOOOOOOOO|
-  | * * * * * * * * *  ::::::::::::::::::::;::::|
+  | * * * * * * * * *  :::::::::::::::::::::::::|
   |* * * * * * * * * * OOOOOOOOOOOOOOOOOOOOOOOOO|
   |:::::::::::::::::::::::::::::::::::::::::::::|
   |OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO|
diff --git a/cows/luke-koala.cow b/cows/luke-koala.cow
index 4dff0de..c049ec6 100644
--- a/cows/luke-koala.cow
+++ b/cows/luke-koala.cow
@@ -10,6 +10,6 @@ $the_cow = <<EOC;
      ()~*~()   
      (_)-(_)   
      Luke    
-     Sywalker
+     Skywalker
      koala   
 EOC
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..2537ffd
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,162 @@
+/**
+ * @property text : text
+ * 
+ * @Cow
+ * @property f : cow name
+ * @property r : random selection
+ * 
+ * @Face
+ * @property T : Tongue
+ * @property e : eyes
+ * 
+ * @Modes
+ * @property b : borg 
+ * @property d : dead
+ * @property g : greedy
+ * @property p : paranoia
+ * @property s : stoned
+ * @property t : tired
+ * @property w : wired
+ * @property y : youthful
+ */
+export interface IOptions {
+    text: string,
+    // cow
+    f?: string, // cow name
+    r?: boolean, // random mode
+    // face
+    e?: string, // eyes
+    T?: string, // tongue
+    // modes
+    b?: boolean, // borg 
+    d?: boolean, // dead
+    g?: boolean, // greedy
+    p?: boolean, // paranoia
+    s?: boolean, // stoned
+    t?: boolean, // tired
+    w?: boolean, // wired
+    y?: boolean, // youthful
+}
+
+type callback_type = (error: NodeJS.ErrnoException, cow_names: string[]) => void;
+
+/**
+ * @param callback
+ * @returns a list of cow names from the cows folder without the .cow extension.
+ * @example
+ * ```
+ * function get_cows(error: NodeJS.ErrnoException, cow_names: Array<string>): void {
+ *    if (error) {
+ *        console.log(`Error getting cow names: ${error.message}`);
+ *    }
+ *    else if (cow_names) {
+ *        console.log(`Number of cows available: ${cow_names.length}`);
+ *    }
+ *  }
+ * 
+ * cowsay.list(get_cows);
+ * ```
+ */
+export function list(callback: callback_type): Promise<string[]>;
+
+/**
+ * @param options
+ * ## Face :
+ * Either choose a mode (set the value as true) **_or_**
+ * set your own defined eyes and tongue to `e` and `T`.
+ * - ### `e` : eyes
+ * - ### `T` : tongue
+ * 
+ * ## Cow :
+ * Either specify a cow name (e.g. "fox") **_or_**
+ * set the value of `r` to true which selects a random cow.
+ * - ### `r` : random selection
+ * - ### `f` : cow name - from `cows` folder
+ * 
+ * ## Modes :
+ * Modes are just ready-to-use faces, here's their list:
+ * - #### `b` : borg
+ * - #### `d` : dead      
+ * - #### `g` : greedy
+ * - #### `p` : paranoia
+ * - #### `s` : stoned
+ * - #### `t` : tired
+ * - #### `w` : wired
+ * - #### `y` : youthful
+ * 
+ * @example
+ * ```
+ * // custom cow and face
+ * cowsay.say({
+ *     text: 'Hello world!',
+ *     e: '^^', // eyes
+ *     T: 'U ', // tongue
+ *     f: 'USA' // name of the cow from `cows` folder
+ * })
+ * 
+ * // using a random cow
+ * cowsay.say({
+ *     text: 'Hello world!',
+ *     e: 'xx', // eyes
+ *     r: true, // random mode - use a random cow.
+ * })
+ * 
+ * // using a mode
+ * cowsay.say({
+ *     text: 'Hello world!',
+ *     y: true, // using y mode - youthful mode
+ * })
+ * ```
+ */
+export function say(options: IOptions): string;
+
+/**
+ * @param options
+ * ## Face :
+ * Either choose a mode (set the value as true) **_or_**
+ * set your own defined eyes and tongue to `e` and `T`.
+ * - ### `e` : eyes
+ * - ### `T` : tongue
+ * 
+ * ## Cow :
+ * Either specify a cow name (e.g. "fox") **_or_**
+ * set the value of `r` to true which selects a random cow.
+ * - ### `r` : random selection
+ * - ### `f` : cow name - from `cows` folder
+ * 
+ * ## Modes :
+ * Modes are just ready-to-use faces, here's their list:
+ * - #### `b` : borg
+ * - #### `d` : dead      
+ * - #### `g` : greedy
+ * - #### `p` : paranoia
+ * - #### `s` : stoned
+ * - #### `t` : tired
+ * - #### `w` : youthful
+ * - #### `y` : wired
+ * 
+ * @example
+ * ```
+ * // custom cow and face
+ * cowsay.think({
+ *     text: 'Hello world!',
+ *     e: '^^', // eyes
+ *     T: 'U ', // tongue
+ *     f: 'USA' // name of the cow from `cows` folder
+ * })
+ * 
+ * // using a random cow
+ * cowsay.think({
+ *     text: 'Hello world!',
+ *     e: 'xx', // eyes
+ *     r: true, // random mode - use a random cow.
+ * })
+ * 
+ * // using a mode
+ * cowsay.think({
+ *     text: 'Hello world!',
+ *     y: true, // using y mode - youthful mode
+ * })
+ * ```
+ */
+export function think(options: IOptions): string;
diff --git a/index.js b/index.js
index 35b5edf..4162e0f 100644
--- a/index.js
+++ b/index.js
@@ -1,15 +1,134 @@
-var baloon = require("./lib/balloon");
+var balloon = require("./lib/balloon");
 var cows = require("./lib/cows");
 var faces = require("./lib/faces");
 
+/**
+ * @param options
+ * ## Face :
+ * Either choose a mode (set the value as true) **_or_**
+ * set your own defined eyes and tongue to `e` and `T`.
+ * - ### `e` : eyes
+ * - ### `T` : tongue
+ * 
+ * ## Cow :
+ * Either specify a cow name (e.g. "fox") **_or_**
+ * set the value of `r` to true which selects a random cow.
+ * - ### `r` : random selection
+ * - ### `f` : cow name - from `cows` folder
+ * 
+ * ## Modes :
+ * Modes are just ready-to-use faces, here's their list:
+ * - #### `b` : borg
+ * - #### `d` : dead      
+ * - #### `g` : greedy
+ * - #### `p` : paranoia
+ * - #### `s` : stoned
+ * - #### `t` : tired
+ * - #### `w` : wired
+ * - #### `y` : youthful
+ * 
+ * @example
+ * ```
+ * // custom cow and face
+ * cowsay.say({
+ *     text: 'Hello world!',
+ *     e: '^^', // eyes
+ *     T: 'U ', // tongue
+ *     f: 'USA' // name of the cow from `cows` folder
+ * })
+ * 
+ * // using a random cow
+ * cowsay.say({
+ *     text: 'Hello world!',
+ *     e: 'xx', // eyes
+ *     r: true, // random mode - use a random cow.
+ * })
+ * 
+ * // using a mode
+ * cowsay.say({
+ *     text: 'Hello world!',
+ *     y: true, // using y mode - youthful mode
+ * })
+ * ```
+ * 
+ * @returns {string} compiled cow
+ */
 exports.say = function (options) {
 	return doIt(options, true);
 };
 
+/**
+ * @param options
+ * ## Face :
+ * Either choose a mode (set the value as true) **_or_**
+ * set your own defined eyes and tongue to `e` and `T`.
+ * - ### `e` : eyes
+ * - ### `T` : tongue
+ * 
+ * ## Cow :
+ * Either specify a cow name (e.g. "fox") **_or_**
+ * set the value of `r` to true which selects a random cow.
+ * - ### `r` : random selection
+ * - ### `f` : cow name - from `cows` folder
+ * 
+ * ## Modes :
+ * Modes are just ready-to-use faces, here's their list:
+ * - #### `b` : borg
+ * - #### `d` : dead      
+ * - #### `g` : greedy
+ * - #### `p` : paranoia
+ * - #### `s` : stoned
+ * - #### `t` : tired
+ * - #### `w` : wired
+ * - #### `y` : youthful
+ * 
+ * @example
+ * ```
+ * // custom cow and face
+ * cowsay.think({
+ *     text: 'Hello world!',
+ *     e: '^^', // eyes
+ *     T: 'U ', // tongue
+ *     f: 'USA' // name of the cow from `cows` folder
+ * })
+ * 
+ * // using a random cow
+ * cowsay.think({
+ *     text: 'Hello world!',
+ *     e: 'xx', // eyes
+ *     r: true, // random mode - use a random cow.
+ * })
+ * 
+ * // using a mode
+ * cowsay.think({
+ *     text: 'Hello world!',
+ *     y: true, // using y mode - youthful mode
+ * })
+ * ```
+ * 
+ * @returns {string} compiled cow
+ */
 exports.think = function (options) {
 	return doIt(options, false);
 };
 
+/**
+ * @example
+ * ```
+ * function get_cows(error, cow_names) {
+ *    if (error) {
+ *        console.log(error);
+ *    }
+ *    else if (cow_names) {
+ *        console.log(`Number of cows available: ${cow_names.length}`);
+ *    }
+ *  }
+ * 
+ * cowsay.list(get_cows);
+ * ```
+ * @param callback
+ * @returns {Promise} promise
+ */
 exports.list = cows.list;
 
 function doIt (options, sayAloud) {
@@ -27,5 +146,5 @@ function doIt (options, sayAloud) {
 	face.thoughts = sayAloud ? "\\" : "o";
 
 	var action = sayAloud ? "say" : "think";
-	return baloon[action](options.text || options._.join(" "), options.n ? null : options.W) + "\n" + cow(face);
+	return balloon[action](options.text || options._.join(" "), options.n ? null : options.W) + "\n" + cow(face);
 }
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..5911d47
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1302 @@
+{
+  "name": "cowsay",
+  "version": "1.5.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@rollup/plugin-commonjs": {
+      "version": "15.0.0",
+      "resolved": "https://registry.npmjs.org/@rollup/plugin-commonjs/-/plugin-commonjs-15.0.0.tgz",
+      "integrity": "sha512-8uAdikHqVyrT32w1zB9VhW6uGwGjhKgnDNP4pQJsjdnyF4FgCj6/bmv24c7v2CuKhq32CcyCwRzMPEElaKkn0w==",
+      "dev": true,
+      "requires": {
+        "@rollup/pluginutils": "^3.1.0",
+        "commondir": "^1.0.1",
+        "estree-walker": "^2.0.1",
+        "glob": "^7.1.6",
+        "is-reference": "^1.2.1",
+        "magic-string": "^0.25.7",
+        "resolve": "^1.17.0"
+      }
+    },
+    "@rollup/plugin-node-resolve": {
+      "version": "9.0.0",
+      "resolved": "https://registry.npmjs.org/@rollup/plugin-node-resolve/-/plugin-node-resolve-9.0.0.tgz",
+      "integrity": "sha512-gPz+utFHLRrd41WMP13Jq5mqqzHL3OXrfj3/MkSyB6UBIcuNt9j60GCbarzMzdf1VHFpOxfQh/ez7wyadLMqkg==",
+      "dev": true,
+      "requires": {
+        "@rollup/pluginutils": "^3.1.0",
+        "@types/resolve": "1.17.1",
+        "builtin-modules": "^3.1.0",
+        "deepmerge": "^4.2.2",
+        "is-module": "^1.0.0",
+        "resolve": "^1.17.0"
+      }
+    },
+    "@rollup/pluginutils": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@rollup/pluginutils/-/pluginutils-3.1.0.tgz",
+      "integrity": "sha512-GksZ6pr6TpIjHm8h9lSQ8pi8BE9VeubNT0OMJ3B5uZJ8pz73NPiqOtCog/x2/QzM1ENChPKxMDhiQuRHsqc+lg==",
+      "dev": true,
+      "requires": {
+        "@types/estree": "0.0.39",
+        "estree-walker": "^1.0.1",
+        "picomatch": "^2.2.2"
+      },
+      "dependencies": {
+        "estree-walker": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-1.0.1.tgz",
+          "integrity": "sha512-1fMXF3YP4pZZVozF8j/ZLfvnR8NSIljt56UhbZ5PeeDmmGHpgpdwQt7ITlGvYaQukCvuBRMLEiKiYC+oeIg4cg==",
+          "dev": true
+        }
+      }
+    },
+    "@types/color-name": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
+      "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ=="
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+      "dependencies": {
+        "ansi-regex": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
+          "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg=="
+        },
+        "is-fullwidth-code-point": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
+          "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg=="
+        },
+        "string-width": {
+          "version": "4.2.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
+          "integrity": "sha512-zUz5JD+tgqtuDjMhwIg5uFVV3dtqZ9yQJlZVfq4I01/K5Paj5UHj7VyrQOJvzawSVlKpObApbfD0Ed6yJc+1eg==",
+          "requires": {
+            "emoji-regex": "^8.0.0",
+            "is-fullwidth-code-point": "^3.0.0",
+            "strip-ansi": "^6.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
+          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
+          "requires": {
+            "ansi-regex": "^5.0.0"
+          }
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "18.1.3",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-18.1.3.tgz",
+      "integrity": "sha512-o50j0JeToy/4K6OZcaQmW6lyXXKhq7csREXcDwk2omFPJEwUNOVtJKvmDr9EI1fAJZUyZcRF7kxGBWmRXudrCQ==",
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
index 7492c95..7911c63 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cowsay",
-  "version": "1.4.0",
+  "version": "1.5.0",
   "description": "cowsay is a configurable talking cow",
   "keywords": [
     "cow",
@@ -18,6 +18,7 @@
   },
   "license": "MIT",
   "main": "./index",
+  "types": "./index.d.ts",
   "module": "./build/cowsay.es.js",
   "browser": "./build/cowsay.umd.js",
   "bin": {
@@ -26,6 +27,7 @@
   },
   "files": [
     "index.js",
+    "index.d.ts",
     "cli.js",
     "build/",
     "cows/",
@@ -36,21 +38,23 @@
     "url": "https://github.com/piuccio/cowsay.git"
   },
   "scripts": {
-    "prepublish": "rollup -c",
-    "test": "node test.js"
+    "prepare": "rollup -c",
+    "test": "tape test/**/*.js | tap-dot"
   },
   "dependencies": {
-    "get-stdin": "^5.0.1",
-    "optimist": "~0.6.1",
+    "get-stdin": "8.0.0",
     "string-width": "~2.1.1",
-    "strip-eof": "^1.0.0"
+    "strip-final-newline": "2.0.0",
+    "yargs": "15.4.1"
   },
   "devDependencies": {
-    "nodeunit": "~0.11.1",
-    "rollup": "^0.48.2",
-    "rollup-plugin-commonjs": "^8.2.0",
-    "rollup-plugin-node-resolve": "^3.0.0",
-    "rollup-plugin-string": "^2.0.2"
+    "@rollup/plugin-commonjs": "15.0.0",
+    "@rollup/plugin-node-resolve": "9.0.0",
+    "execa": "5.0.0",
+    "rollup": "2.26.5",
+    "rollup-plugin-string": "3.0.0",
+    "tap-dot": "2.0.0",
+    "tape": "5.0.1"
   },
   "preferGlobal": true,
   "engines": {
diff --git a/rollup.config.js b/rollup.config.js
index 53a4190..a0c62cc 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -1,22 +1,18 @@
-import commonjs from 'rollup-plugin-commonjs';
-import nodeResolve from 'rollup-plugin-node-resolve';
-import string from 'rollup-plugin-string';
+import commonjs from '@rollup/plugin-commonjs';
+import {nodeResolve} from '@rollup/plugin-node-resolve';
+import {string} from 'rollup-plugin-string';
 
 export default {
   input: 'browser.js',
   plugins: [
-    nodeResolve({
-      module: true,
-      jsnext: true,
-    }),
+    nodeResolve(),
     commonjs(),
     string({
       include: '**/*.cow',
     }),
   ],
-  name: 'cowsay',
   output: [
-    { file: 'build/cowsay.umd.js', format: 'umd' },
+    { file: 'build/cowsay.umd.js', format: 'umd', name: 'cowsay' },
     { file: 'build/cowsay.es.js', format: 'es' },
-  ]
+  ],
 }
diff --git a/test.js b/test.js
deleted file mode 100644
index 6fc2b11..0000000
--- a/test.js
+++ /dev/null
@@ -1 +0,0 @@
-require("nodeunit").reporters.default.run(['test']);
\ No newline at end of file
diff --git a/test/balloon.js b/test/balloon.js
index 988f870..4c7da1e 100644
--- a/test/balloon.js
+++ b/test/balloon.js
@@ -1,105 +1,72 @@
-var balloon = require("../lib/balloon");
-
-exports.singleLine = {
-	nowrap : function (test) {
-		test.expect(2);
-
-		var say = balloon.say("Hi!");
-		var expected = " _____\n< Hi! >\n -----";
-		test.equal(say, expected);
-
-		var think = balloon.think("Hi!");
-		expected = " _____\n( Hi! )\n -----";
-		test.equal(think, expected);
-
-		test.done();
-	},
-
-	wrap : function (test) {
-		test.expect(2);
-
-		var say = balloon.say("Yes", 10);
-		var expected = " _____\n< Yes >\n -----";
-		test.equal(say, expected);
-
-		var think = balloon.think("Yes", 10);
-		expected = " _____\n( Yes )\n -----";
-		test.equal(think, expected);
-
-		test.done();
-	}
-};
-
-exports.twoLines = {
-	nowrap : function (test) {
-		test.expect(2);
-
-		var say = balloon.say("AB\nCDE");
-		var expected = " _____\n/ AB  \\\n\\ CDE /\n -----";
-		test.equal(say, expected);
-
-		var think = balloon.think("AB\nCDE");
-		expected = " _____\n( AB  )\n( CDE )\n -----";
-		test.equal(think, expected);
-
-		test.done();
-	},
-
-	wrap : function (test) {
-		test.expect(2);
-
-		var say = balloon.say("ABCDEF", 4);
-		var expected = " ______\n/ ABCD \\\n\\ EF   /\n ------";
-		test.equal(say, expected);
-
-		var think = balloon.think("ABCDEF", 4);
-		expected = " ______\n( ABCD )\n( EF   )\n ------";
-		test.equal(think, expected);
-
-		test.done();
-	}
-};
-
-exports.multiLine = {
-	nowrap : function (test) {
-		test.expect(2);
-
-		var say = balloon.say("AB\nCDE\nQWE RTY");
-		var expected = " _________\n/ AB      \\\n| CDE     |\n\\ QWE RTY /\n ---------";
-		test.equal(say, expected);
-
-		var think = balloon.think("AB\nCDE\nQWE RTY");
-		expected = " _________\n( AB      )\n( CDE     )\n( QWE RTY )\n ---------";
-		test.equal(think, expected);
-
-		test.done();
-	},
-
-	wrap : function (test) {
-		test.expect(2);
-
-		var say = balloon.say("ONE\nTWO THREE", 4);
-		var expected = " ______\n/ ONE  \\\n| TWO  |\n| THRE |\n\\ E    /\n ------";
-		test.equal(say, expected);
-
-		var think = balloon.think("ONE\nTWO THREE", 4);
-		expected = " ______\n( ONE  )\n( TWO  )\n( THRE )\n( E    )\n ------";
-		test.equal(think, expected);
-
-		test.done();
-	},
-
-	equal : function (test) {
-		test.expect(2);
-
-		var say = balloon.say("ONE\nTWO\nABC\n", 3);
-		var expected = " _____\n/ ONE \\\n| TWO |\n\\ ABC /\n -----";
-		test.equal(say, expected);
-
-		var think = balloon.think("ONE\nTWO\nABC\n", 3);
-		expected = " _____\n( ONE )\n( TWO )\n( ABC )\n -----";
-		test.equal(think, expected);
-
-		test.done();
-	}
-};
\ No newline at end of file
+const test = require('tape');
+const balloon = require('../lib/balloon');
+
+test('single line - nowrap', (t) => {
+	t.plan(2);
+
+	t.equal(' _____\n< Hi! >\n -----', balloon.say('Hi!'));
+	t.equal(' _____\n( Hi! )\n -----', balloon.think('Hi!'));
+});
+
+test('single line - wrap', (t) => {
+	t.plan(2);
+
+	t.equal(' _____\n< Yes >\n -----', balloon.say('Yes', 10));
+	t.equal(' _____\n( Yes )\n -----', balloon.think('Yes', 10));
+});
+
+test('two lines - nowrap', (t) => {
+	t.plan(2);
+	t.equal([
+		' _____',
+		'/ AB  \\',
+		'\\ CDE /',
+		' -----',
+	].join('\n'), balloon.say('AB\nCDE'));
+	t.equal([
+		' _____',
+		'( AB  )',
+		'( CDE )',
+		' -----',
+	].join('\n'), balloon.think('AB\nCDE'));
+});
+
+test('multiple lines - nowrap', (t) => {
+	t.plan(2);
+
+	t.equal([
+		' _________',
+		'/ AB      \\',
+		'| CDE     |',
+		'\\ QWE RTY /',
+		' ---------',
+	].join('\n'), balloon.say('AB\nCDE\nQWE RTY'));
+	t.equal([
+		' _________',
+		'( AB      )',
+		'( CDE     )',
+		'( QWE RTY )',
+		' ---------',
+	].join('\n'), balloon.think('AB\nCDE\nQWE RTY'));
+});
+
+test('multiple lines - wrap to max lenght', (t) => {
+	t.plan(2);
+
+	t.equal([
+		' ______',
+		'/ ONE  \\',
+		'| TWO  |',
+		'| THRE |',
+		'\\ E    /',
+		' ------',
+	].join('\n'), balloon.say('ONE\nTWO THREE', 4));
+	t.equal([
+		' ______',
+		'( ONE  )',
+		'( TWO  )',
+		'( THRE )',
+		'( E    )',
+		' ------',
+	].join('\n'), balloon.think('ONE\nTWO THREE', 4));
+});
diff --git a/test/cli.js b/test/cli.js
new file mode 100644
index 0000000..6836ff1
--- /dev/null
+++ b/test/cli.js
@@ -0,0 +1,20 @@
+const test = require('tape');
+const execa = require('execa');
+
+test('say something', async (t) => {
+  t.plan(1);
+  const { stdout } = await execa.node('cli.js', ['say']);
+  t.match(stdout, /< say >/);
+});
+
+test('think something', async (t) => {
+  t.plan(1);
+  const { stdout } = await execa.node('cli.js', ['--think', 'something']);
+  t.match(stdout, /( something )/);
+});
+
+test('from stdin', async (t) => {
+  t.plan(1);
+  const { stdout } = await execa.node('cli.js', { input: 'echo' });
+  t.match(stdout, /< echo >/);
+});
diff --git a/test/cows.js b/test/cows.js
index 7fe5512..1a36a89 100644
--- a/test/cows.js
+++ b/test/cows.js
@@ -1,48 +1,48 @@
-var cowFormat = "#Comment \
-# just some other comment, it's going to be ignored anyway ...\
-$the_cow = <<EOC;\n\
- $thoughts\
-   $thoughts\
-chars($eyes) \
-$tongue\
-\nEOC\n\
-\
-";
+const test = require('tape');
+const replacer = require('../lib/replacer');
 
-// They are the same...
-var plainText = "\
- $thoughts\
-   $thoughts\
-chars($eyes) \
-$tongue";
-
-var expected = " ||   ||chars(oo) U ";
-
-var replacer = require("../lib/replacer");
-exports.cowFormat = function (test) {
-	test.expect(1);
-
-	var cow = replacer(cowFormat, {
-		thoughts : "||",
-		eyes : "oo",
-		tongue : "U "
-	});
-
-	test.equal(cow, expected);
+const cowFormat = `#Comment 
+# just some other comment, it's going to be ignored anyway ...
+$the_cow = <<EOC;\n
+ $thoughts
+   $thoughts
+chars($eyes)
+$tongue
+EOC
 
-	test.done();
-};
+`;
 
-exports.plainText = function (test) {
-	test.expect(1);
-
-	var cow = replacer(plainText, {
-		thoughts : "||",
-		eyes : "oo",
-		tongue : "U "
-	});
-
-	test.equal(cow, expected);
-
-	test.done();
-};
\ No newline at end of file
+// They are the same...
+const plainText = `
+ $thoughts
+   $thoughts
+chars($eyes)
+$tongue`;
+
+const expected = `
+ ||
+   ||
+chars(oo)
+U `;
+
+test('original cow file format', (t) => {
+  t.plan(1);
+
+  const cow = replacer(cowFormat, {
+    thoughts: '||',
+    eyes: 'oo',
+    tongue: 'U ',
+  });
+  t.equal(cow, expected);
+});
+
+test('plain text file', (t) => {
+  t.plan(1);
+
+  const cow = replacer(plainText, {
+    thoughts: '||',
+    eyes: 'oo',
+    tongue: 'U ',
+  });
+  t.equal(cow, expected);
+});
diff --git a/test/faces.js b/test/faces.js
index 2675375..7bc0db9 100644
--- a/test/faces.js
+++ b/test/faces.js
@@ -1,25 +1,25 @@
-var getFace = require("../lib/faces");
+const test = require('tape');
+const getFace = require('../lib/faces');
 
-exports.getFace = function (test) {
-	test.expect(4);
+test('no mode', (t) => {
+  t.plan(2);
 
-	// Defaults
-	var face = getFace({
-		e : "oo",
-		T : "  "
-	});
-	test.equal(face.eyes, "oo");
-	test.equal(face.tongue, "  ");
+  const face = getFace({
+    e: 'oo',
+    T: '  ',
+  });
+  t.equal(face.eyes, 'oo');
+  t.equal(face.tongue, '  ');
+});
 
-	// One mode
-	var face = getFace({
-		g : true,
-		e : "oo",
-		T : "  "
-	});
-	test.equal(face.eyes, "$$");
-	test.equal(face.tongue, "  ");
+test('mode overrides provided values', (t) => {
+  t.plan(2);
 
-	// I don't really want to test two modes
-	test.done();
-}
\ No newline at end of file
+  const face = getFace({
+    g: true,
+    e: 'oo',
+    T: 'O ',
+  });
+  t.equal(face.eyes, '$$');
+  t.equal(face.tongue, '  ');
+});