diff --git a/readline-sync/index.d.ts b/readline-sync/index.d.ts
new file mode 100644
index 0000000000..78d7e313f9
--- /dev/null
+++ b/readline-sync/index.d.ts
@@ -0,0 +1,87 @@
+// Type definitions for readline-sync 1.4
+// Project: https://github.com/anseki/readline-sync
+// Definitions by: Tristan Jones <https://github.com/jonestristand>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+type OptionType = string | number | RegExp | ((input: string) => boolean);
+
+interface BasicOptions {
+    prompt?: any;
+    hideEchoBack?: boolean;
+    mask?: string;
+    limit?: OptionType | OptionType[];
+    limitMessage?: string;
+    defaultInput?: string;
+    trueValue?: OptionType | OptionType[];
+    falseValue?: OptionType | OptionType[];
+    caseSensitive?: boolean;
+    keepWhitespace?: boolean;
+    encoding?: string;
+    bufferSize?: number;
+    print?: (display: string, encoding: string) => void;
+    history?: boolean;
+    cd?: boolean;
+    charlist?: string;
+    min?: any;
+    max?: any;
+    confirmMessage?: any;
+    unmatchMessage?: any;
+    exists?: any;
+    isFile?: boolean;
+    isDirectory?: boolean;
+    validate?: (path: string) => boolean | string;
+    create?: boolean;
+    guide?: boolean;
+}
+
+// Basic Functions
+export function question(query?: any, options?: BasicOptions): string;
+export function prompt(options?: BasicOptions): string;
+export function keyIn(query?: any, options?: BasicOptions): string;
+export function setDefaultOptions(options?: BasicOptions): BasicOptions;
+
+// Utility Functions
+export function questionEMail(query?: any, options?: BasicOptions): string;
+export function questionNewPassword(query?: any, options?: BasicOptions): string;
+export function questionInt(query?: any, options?: BasicOptions): number;
+export function questionFloat(query?: any, options?: BasicOptions): number;
+export function questionPath(query?: any, options?: BasicOptions): string;
+
+export function promptCL(commandHandler?: { [id: string]: (...args: string[]) => void } | ((command: string, ...args: string[]) => void), options?: BasicOptions): string[];
+export function promptLoop(inputHandler: (value: string) => boolean, options?: BasicOptions): void;
+export function promptCLLoop(commandHandler?: { [id: string]: (...args: string[]) => boolean | void } | ((command: string, ...args: string[]) => boolean | void), options?: BasicOptions): void;
+export function promptSimShell(options?: BasicOptions): string;
+
+export function keyInYN(query?: any, options?: BasicOptions): boolean | string;
+export function keyInYNStrict(query?: any, options?: BasicOptions): boolean;
+export function keyInPause(query?: any, options?: BasicOptions): void;
+export function keyInSelect(items: string[], query?: any, options?: BasicOptions): number;
+
+export function getRawInput(): string;
+
+// Deprecated
+
+/**
+ * @deprecated Use the bufferSize option instead: readlineSync.setDefaultOptions({bufferSize: value});
+ */
+export function setBufferSize(value: number): void;
+
+/**
+ * @deprecated Use the encoding option instead: readlineSync.setDefaultOptions({encoding: value});
+ */
+export function setEncoding(value: string): void;
+
+/**
+ * @deprecated Use the mask option instead: readlineSync.setDefaultOptions({mask: value});
+ */
+export function setMask(value: string): void;
+
+/**
+ * @deprecated Use the print option instead: readlineSync.setDefaultOptions({print: value});
+ */
+export function setPrint(value: (display: string, encoding: string) => void): void;
+
+/**
+ * @deprecated Use the prompt option instead: readlineSync.setDefaultOptions({prompt: value});
+ */
+export function setPrompt(value: any): void;
\ No newline at end of file
diff --git a/readline-sync/readline-sync-tests.ts b/readline-sync/readline-sync-tests.ts
new file mode 100644
index 0000000000..02c8d8e952
--- /dev/null
+++ b/readline-sync/readline-sync-tests.ts
@@ -0,0 +1,109 @@
+
+
+import readlineSync = require('readline-sync');
+
+let result:string = readlineSync.question('Which program starts do you want? ', {
+  defaultInput: 'firefox'
+});
+
+let result2:string = readlineSync.prompt({prompt: '$$'});
+
+let result3:string = readlineSync.keyIn('Press a key', { limit: '$<1-5>' });
+
+let result4:{} = readlineSync.setDefaultOptions({
+    prompt: '$$',
+    hideEchoBack: true,
+    mask: '*',
+    limit: [ /^a|b$/, /[a-zA-Z]+/],
+    limitMessage: 'Limit reached',
+    defaultInput: 'English',
+    trueValue: 2,
+    falseValue: (value:string) => { return true; },
+    caseSensitive: true,
+    keepWhitespace: true,
+    encoding: 'utf-8',
+    bufferSize: 12,
+    print: (display:string, encoding:string) => { console.log(display)},
+    history: false,
+    cd: true,
+    charlist: 'abc',
+    min: 0,
+    max: 10,
+    confirmMessage: 'Yes',
+    unmatchMessage: new Date(),
+    exists: false,
+    isFile: true,
+    isDirectory: false,
+    validate: (path:string) => { return (path === '/usr/local/bin'); },
+    create: true,
+    guide: false,
+});
+
+let result5:string = readlineSync.questionEMail('Enter email');
+
+let result6:string = readlineSync.questionNewPassword('PASSWORD: ', {charlist: '$<a-z>#$@%'});
+
+let result7:number = readlineSync.questionInt('Enter an integer', { limitMessage: 'Enter a valid integer' });
+
+let result8:number = readlineSync.questionFloat('Enter a float', { limitMessage: 'Enter a valid float' });
+
+let result9:string = readlineSync.questionPath('Save to: ', {
+  isDirectory: true,
+  exists: null,
+  create: true
+});
+
+readlineSync.promptCL((command:string, arg1:string, arg2:string) => {
+  if (command === 'add') {
+    console.log(arg1 + ' is added.');
+  } else if (command === 'copy') {
+    console.log(arg1 + ' is copied to ' + arg2 + '.');
+  }
+});
+
+readlineSync.promptCL({
+  add: (element:string) => { // It's called by also "ADD", "Add", "aDd", etc..
+    console.log(element + ' is added.');
+  },
+  copy: (from:string, to:string) => {
+    console.log(from + ' is copied to ' + to + '.');
+  }
+});
+
+readlineSync.promptLoop((input:string) => {
+  console.log('-- You said "' + input + '"');
+  return input === 'bye';
+});
+
+readlineSync.promptCLLoop({
+  add: (element:string) => {
+    console.log(element + ' is added.');
+  },
+  copy: (from:string, to:string) => {
+    console.log(from + ' is copied to ' + to + '.');
+  },
+  bye: () => { return true; }
+});
+
+let result10:string = readlineSync.promptSimShell();
+
+let result11:(boolean | string) = readlineSync.keyInYN('Do you want to install this?');
+
+let result12:boolean = readlineSync.keyInYNStrict('Do you want to install this?', { guide: true });
+
+readlineSync.keyInPause({ guide:true });
+
+let frameworks = ['Express', 'hapi', 'flatiron', 'MEAN.JS', 'locomotive'];
+let result13:number = readlineSync.keyInSelect(frameworks, 'Which framework?');
+
+let result14:string = readlineSync.getRawInput();
+
+readlineSync.setPrint((display:string, encoding:string) => { console.log(display) });
+
+readlineSync.setPrompt(new Date());
+
+readlineSync.setEncoding('utf-16');
+
+readlineSync.setMask('%');
+
+readlineSync.setBufferSize(128);
diff --git a/readline-sync/tsconfig.json b/readline-sync/tsconfig.json
new file mode 100644
index 0000000000..144427ec3c
--- /dev/null
+++ b/readline-sync/tsconfig.json
@@ -0,0 +1,20 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es6",
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "readline-sync-tests.ts"
+    ]
+}
diff --git a/readline-sync/tslint.json b/readline-sync/tslint.json
new file mode 100644
index 0000000000..377cc837d4
--- /dev/null
+++ b/readline-sync/tslint.json
@@ -0,0 +1 @@
+{ "extends": "../tslint.json" }