[react-scrollbar-size] Introduce type definitions (#38768)

types/react-scrollbar-size/index.d.ts

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+// Type definitions for react-scrollbar-size 2.1
+// Project: https://github.com/STORIS/react-scrollbar-size#readme
+// Definitions by: Alex Bukurov <https://github.com/abukurov>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.8
+
+import * as React from 'react';
+
+export interface Measurement {
+  scrollbarWidth: number;
+  scrollbarHeight: number;
+}
+
+export interface ScrollbarSizeProps {
+  onLoad?: (measurement: Measurement) => void;
+  onChange?: (measurement: Measurement) => void;
+}
+
+export default class ScrollbarSize extends React.Component<ScrollbarSizeProps> {
+}

types/react-scrollbar-size/react-scrollbar-size-tests.tsx

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+import * as React from "react";
+import ScrollbarSize from "react-scrollbar-size";
+
+const elements = [
+  <ScrollbarSize/>,
+  <ScrollbarSize
+    onLoad={measurement => {
+      console.log(measurement.scrollbarWidth, measurement.scrollbarHeight);
+    }}
+    onChange={measurement => {
+      console.log(measurement.scrollbarWidth, measurement.scrollbarHeight);
+    }}
+  />
+];

types/react-scrollbar-size/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "jsx": "react",
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "react-scrollbar-size-tests.tsx"
+    ]
+}

types/react-scrollbar-size/tslint.json

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+{ "extends": "dtslint/dt.json" }