Add babel-plugin-syntax-jsx package (#18282)

types/babel-plugin-syntax-jsx/babel-plugin-syntax-jsx-tests.ts

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+import jsx from "babel-plugin-syntax-jsx";
+
+// Example taken from the babel plugin handbook:
+// https://github.com/thejameskyle/babel-handbook/blob/master/translations/en/plugin-handbook.md#-enabling-syntax-in-plugins
+export default function myBabelPlugin() {
+    return {
+        visitor: {},
+        inherits: jsx,
+    };
+}

types/babel-plugin-syntax-jsx/index.d.ts

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+// Type definitions for babel-plugin-syntax-jsx 6.18
+// Project: https://github.com/babel/babel/tree/master/packages/babel-plugin-syntax-jsx
+// Definitions by: Marvin Hagemeister <https://github.com/marvinhagemeister>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+// NB: This export doesn't match the handbook example, where `jsx` is the default export.
+// But it does match the runtime behaviour (at least at the time of this writing). For some reason,
+// babel-plugin-syntax-jsx/lib/index.js has this line at the bottom: module.exports = exports["default"];
+declare function jsx(): {
+    manipulateOptions(opts: any, parserOpts: { plugins: string[] }): void;
+};
+
+export default jsx;

types/babel-plugin-syntax-jsx/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": false,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "babel-plugin-syntax-jsx-tests.ts"
+    ]
+}

types/babel-plugin-syntax-jsx/tslint.json

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