Add types for react-relative-portal (#45182)

* generate typings for react-relative-portal

* implement types and add tests

types/react-relative-portal/index.d.ts

@@ -0,0 +1,23 @@
+// Type definitions for react-relative-portal 1.8
+// Project: https://github.com/smartprogress/react-relative-portal#readme
+// Definitions by: Andy Katz <https://github.com/katz12>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+import * as React from 'react';
+
+declare class RelativePortal extends React.Component<RelativePortal.Props> {}
+
+declare namespace RelativePortal {
+    interface Props {
+        children: React.ReactNode;
+        className?: string;
+        component: string;
+        fullWidth?: boolean;
+        left?: number;
+        onOutClick?: () => void;
+        right?: number;
+        top?: number;
+    }
+}
+
+export = RelativePortal;

types/react-relative-portal/react-relative-portal-tests.tsx

@@ -0,0 +1,12 @@
+import * as React from 'react';
+import RelativePortal = require('react-relative-portal');
+
+<React.Fragment>
+    <RelativePortal component="div">
+        <div>portalled content</div>
+    </RelativePortal>
+
+    <RelativePortal component="div" className="portal" fullWidth left={1} onOutClick={() => {}} right={2} top={3}>
+        <div>portalled content</div>
+    </RelativePortal>
+</React.Fragment>;

types/react-relative-portal/tsconfig.json

@@ -0,0 +1,24 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "jsx": "react",
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "react-relative-portal-tests.tsx"
+    ]
+}

types/react-relative-portal/tslint.json

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