[Mobx-cookie] add a new type definition (#29868)

* feat: add type definition for mobx-cookie

* fix: update version and add strictFunctionTypes to satisfy the test

types/mobx-cookie/index.d.ts

@@ -0,0 +1,17 @@
+// Type definitions for mobx-cookie 1.1
+// Project: https://github.com/will-stone/mobx-cookie#readme
+// Definitions by: Duong Tran <https://github.com/t49tran>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.8
+
+import { CookieAttributes } from 'js-cookie';
+
+declare class MobxCookie {
+    constructor(name: string, options?: CookieAttributes);
+
+    get(): any;
+    set(value: any, options?: CookieAttributes): void;
+    remove(): void;
+}
+
+export default MobxCookie;

types/mobx-cookie/mobx-cookie-tests.ts

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+import MobxCookie from 'mobx-cookie';
+
+// Declare a reactive mobx cookie that last for 20 days
+const mobxCookie = new MobxCookie('TEST_MOBX_COOKIE', {expires: 20});
+
+// Set a new value for the cookie that last for 10 days
+mobxCookie.set('MY_VALUE', {expires: 10});
+
+const cookieValue = mobxCookie.get();
+
+mobxCookie.remove();

types/mobx-cookie/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "mobx-cookie-tests.ts"
+    ]
+}

types/mobx-cookie/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }