diff --git a/types/browserslist-useragent/browserslist-useragent-tests.ts b/types/browserslist-useragent/browserslist-useragent-tests.ts
new file mode 100644
index 0000000000..83103178e5
--- /dev/null
+++ b/types/browserslist-useragent/browserslist-useragent-tests.ts
@@ -0,0 +1,30 @@
+import {
+    matchesUA,
+    resolveUserAgent,
+    normalizeQuery
+} from 'browserslist-useragent';
+
+// $ExpectType boolean
+matchesUA(
+    'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36'
+);
+
+// $ExpectType boolean
+matchesUA(
+    'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36',
+    {
+        browsers: ['defaults'],
+        env: 'production',
+        ignorePath: true,
+        ignoreMinor: false,
+        allowHigherVersions: false
+    }
+);
+
+// $ExpectType ResolvedUserAgent
+resolveUserAgent(
+    'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36'
+);
+
+// $ExpectType string
+normalizeQuery('defaults');
diff --git a/types/browserslist-useragent/index.d.ts b/types/browserslist-useragent/index.d.ts
new file mode 100644
index 0000000000..4c7e548a4a
--- /dev/null
+++ b/types/browserslist-useragent/index.d.ts
@@ -0,0 +1,24 @@
+// Type definitions for browserslist-useragent 3.0
+// Project: https://github.com/browserslist/browserslist-useragent (Does not have to be to GitHub, but prefer linking to a source code repository rather than to a project website.)
+// Definitions by: nju33 <https://github.com/nju33>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export interface ResolvedUserAgent {
+    family: string;
+    version: string;
+}
+
+export interface BrowserslistUseragentOptions {
+    browsers?: string[];
+    env?: string;
+    ignorePath?: boolean;
+    ignoreMinor?: boolean;
+    allowHigherVersions?: boolean;
+}
+
+export function matchesUA(
+    uaString: string,
+    opts?: BrowserslistUseragentOptions
+): boolean;
+export function resolveUserAgent(uaString: string): ResolvedUserAgent;
+export function normalizeQuery(query: string): string;
diff --git a/types/browserslist-useragent/tsconfig.json b/types/browserslist-useragent/tsconfig.json
new file mode 100644
index 0000000000..849531b901
--- /dev/null
+++ b/types/browserslist-useragent/tsconfig.json
@@ -0,0 +1,17 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": ["es6"],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": ["../"],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "esModuleInterop": true
+    },
+    "files": ["index.d.ts", "browserslist-useragent-tests.ts"]
+}
diff --git a/types/browserslist-useragent/tslint.json b/types/browserslist-useragent/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/browserslist-useragent/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }