Add testcase when error is reported about unused react

tests/baselines/reference/unusedImports13.errors.txt

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+tests/cases/compiler/foo.tsx(2,8): error TS6133: 'React' is declared but never used.
+
+
+==== tests/cases/compiler/foo.tsx (1 errors) ====
+    
+    import React = require("react");
+           ~~~~~
+!!! error TS6133: 'React' is declared but never used.
+    
+    export const FooComponent = <div></div>
+    
+==== tests/cases/compiler/node_modules/@types/react/index.d.ts (0 errors) ====
+    export = React;
+    export as namespace React;
+    
+    declare namespace React {
+        function createClass<P, S>(spec);
+    }
+    declare global {
+        namespace JSX {
+        }
+    }
+    
+    
+    

tests/baselines/reference/unusedImports13.js

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+//// [tests/cases/compiler/unusedImports13.ts] ////
+
+//// [foo.tsx]
+
+import React = require("react");
+
+export const FooComponent = <div></div>
+
+//// [index.d.ts]
+export = React;
+export as namespace React;
+
+declare namespace React {
+    function createClass<P, S>(spec);
+}
+declare global {
+    namespace JSX {
+    }
+}
+
+
+
+
+//// [foo.jsx]
+"use strict";
+var React = require("react");
+exports.FooComponent = <div></div>;

tests/baselines/reference/unusedImports14.js

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+//// [tests/cases/compiler/unusedImports14.ts] ////
+
+//// [foo.tsx]
+
+import React = require("react");
+
+export const FooComponent = <div></div>
+
+//// [index.d.ts]
+export = React;
+export as namespace React;
+
+declare namespace React {
+    function createClass<P, S>(spec);
+}
+declare global {
+    namespace JSX {
+    }
+}
+
+
+
+
+//// [foo.js]
+"use strict";
+var React = require("react");
+exports.FooComponent = React.createElement("div", null);

tests/baselines/reference/unusedImports14.symbols

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+=== tests/cases/compiler/foo.tsx ===
+
+import React = require("react");
+>React : Symbol(React, Decl(foo.tsx, 0, 0))
+
+export const FooComponent = <div></div>
+>FooComponent : Symbol(FooComponent, Decl(foo.tsx, 3, 12))
+>div : Symbol(unknown)
+>div : Symbol(unknown)
+
+=== tests/cases/compiler/node_modules/@types/react/index.d.ts ===
+export = React;
+>React : Symbol(React, Decl(index.d.ts, 1, 26))
+
+export as namespace React;
+>React : Symbol(React, Decl(index.d.ts, 0, 15))
+
+declare namespace React {
+>React : Symbol(React, Decl(index.d.ts, 1, 26))
+
+    function createClass<P, S>(spec);
+>createClass : Symbol(createClass, Decl(index.d.ts, 3, 25))
+>P : Symbol(P, Decl(index.d.ts, 4, 25))
+>S : Symbol(S, Decl(index.d.ts, 4, 27))
+>spec : Symbol(spec, Decl(index.d.ts, 4, 31))
+}
+declare global {
+>global : Symbol(global, Decl(index.d.ts, 5, 1))
+
+    namespace JSX {
+>JSX : Symbol(JSX, Decl(index.d.ts, 6, 16))
+    }
+}
+
+
+

tests/baselines/reference/unusedImports14.types

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+=== tests/cases/compiler/foo.tsx ===
+
+import React = require("react");
+>React : typeof React
+
+export const FooComponent = <div></div>
+>FooComponent : any
+><div></div> : any
+>div : any
+>div : any
+
+=== tests/cases/compiler/node_modules/@types/react/index.d.ts ===
+export = React;
+>React : typeof React
+
+export as namespace React;
+>React : typeof React
+
+declare namespace React {
+>React : typeof React
+
+    function createClass<P, S>(spec);
+>createClass : <P, S>(spec: any) => any
+>P : P
+>S : S
+>spec : any
+}
+declare global {
+>global : any
+
+    namespace JSX {
+>JSX : any
+    }
+}
+
+
+

tests/cases/compiler/unusedImports13.ts

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+//@noUnusedLocals:true
+//@noUnusedParameters:true
+//@module: commonjs
+//@jsx: preserve
+
+// @filename: foo.tsx
+import React = require("react");
+
+export const FooComponent = <div></div>
+
+// @filename: node_modules/@types/react/index.d.ts
+export = React;
+export as namespace React;
+
+declare namespace React {
+    function createClass<P, S>(spec);
+}
+declare global {
+    namespace JSX {
+    }
+}
+
+

tests/cases/compiler/unusedImports14.ts

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+//@noUnusedLocals:true
+//@noUnusedParameters:true
+//@module: commonjs
+//@jsx: react
+
+// @filename: foo.tsx
+import React = require("react");
+
+export const FooComponent = <div></div>
+
+// @filename: node_modules/@types/react/index.d.ts
+export = React;
+export as namespace React;
+
+declare namespace React {
+    function createClass<P, S>(spec);
+}
+declare global {
+    namespace JSX {
+    }
+}
+
+