diff --git a/types/rtlcss/index.d.ts b/types/rtlcss/index.d.ts
new file mode 100644
index 0000000000..3e2dcb1711
--- /dev/null
+++ b/types/rtlcss/index.d.ts
@@ -0,0 +1,80 @@
+// Type definitions for rtlcss 2.4
+// Project: http://rtlcss.com
+// Definitions by:  Adam Zerella <https://github.com/adamzerella>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.3
+
+export interface MapOptions {
+    scope: string;
+    ignoreCase: boolean;
+    greedy?: boolean;
+}
+
+export interface StringMap {
+    name: string;
+    priority: number;
+    exclusive?: boolean;
+    search: string|string[];
+    replace: string|string[];
+    options: MapOptions;
+}
+
+export interface ConfigOptions {
+    /**
+     * Applies to CSS rules containing no directional properties,
+     * it will update the selector by applying String Map.
+     */
+    autoRename: boolean;
+    /**
+     * Ensures autoRename is applied only if pair exists.
+     */
+    autoRenameStrict: boolean;
+    /**
+     * An object map of disabled plugins directives,
+     * where keys are plugin names and value are object
+     * hash of disabled directives. e.g. {'rtlcss':{'config':true}}.
+     */
+    blacklist: object;
+    /**
+     * Removes directives comments from output CSS.
+     */
+    clean: boolean;
+    /**
+     * Fallback value for String Map options.
+     */
+    greedy: boolean;
+    /**
+     * Applies String Map to URLs. You can also target specific node types using an object literal.
+     * e.g. {'atrule': true, 'decl': false}.
+     */
+    processUrls: boolean|object;
+    /**
+     * The default array of String Map.
+     */
+    stringMap: StringMap[];
+    /**
+     * When enabled, flips background-position expressed in length units using calc.
+     */
+    useCalc: boolean;
+}
+
+export interface HookOptions {
+    /**
+     * The function to be called before processing the CSS.
+     */
+    pre: () => void;
+    /**
+     * The function to be called after processing the CSS.
+     */
+    post: () => void;
+}
+
+/**
+ * Creates a new RTLCSS instance, process the input and return its result.
+ */
+export function process(css: string, options?: object, plugins?: object|string[], hooks?: HookOptions): string;
+
+/**
+ * Creates a new instance of RTLCSS using the passed configuration object.
+ */
+export function configure(config: ConfigOptions): object;
diff --git a/types/rtlcss/rtlcss-tests.ts b/types/rtlcss/rtlcss-tests.ts
new file mode 100644
index 0000000000..1355074c56
--- /dev/null
+++ b/types/rtlcss/rtlcss-tests.ts
@@ -0,0 +1,27 @@
+import * as rtlcss from "rtlcss";
+
+rtlcss.process("body { direction:ltr; }");
+
+const config = {
+    autoRename: false,
+    autoRenameStrict: false,
+    blacklist: {},
+    clean: true,
+    greedy: false,
+    processUrls: false,
+    stringMap: [
+        {
+            name    : 'left-right',
+            priority: 100,
+            search  : ['left', 'Left', 'LEFT'],
+            replace : ['right', 'Right', 'RIGHT'],
+            options : {
+                scope : '*',
+                ignoreCase : false
+            }
+        }
+    ],
+    useCalc: false
+};
+
+rtlcss.configure(config);
diff --git a/types/rtlcss/tsconfig.json b/types/rtlcss/tsconfig.json
new file mode 100644
index 0000000000..94644d49ad
--- /dev/null
+++ b/types/rtlcss/tsconfig.json
@@ -0,0 +1,25 @@
+{
+    "compilerOptions": {
+      "module": "commonjs",
+      "lib": [
+        "es6"
+      ],
+      "noImplicitAny": true,
+      "noImplicitThis": true,
+      "strictNullChecks": true,
+      "strictFunctionTypes": true,
+      "baseUrl": "../",
+      "typeRoots": [
+        "../"
+      ],
+      "types": [
+
+      ],
+      "noEmit": true,
+      "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+      "index.d.ts",
+      "rtlcss-tests.ts"
+    ]
+}
diff --git a/types/rtlcss/tslint.json b/types/rtlcss/tslint.json
new file mode 100644
index 0000000000..e60c15844f
--- /dev/null
+++ b/types/rtlcss/tslint.json
@@ -0,0 +1,3 @@
+{
+    "extends": "dtslint/dt.json"
+}
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