Add types for rollup-plugin-json (#20799)

types/rollup-plugin-json/index.d.ts

@@ -0,0 +1,15 @@
+// Type definitions for rollup-plugin-json 2.3
+// Project: https://github.com/rollup/rollup-plugin-json#readme
+// Definitions by: Andy Mockler <https://github.com/asmockler>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+import { Plugin } from 'rollup';
+
+export interface Options {
+    include?: string | string[];
+    exclude?: string | string[];
+    preferConst?: boolean;
+    indent?: string;
+}
+
+export default function json(options?: Options): Plugin;

types/rollup-plugin-json/rollup-plugin-json-tests.ts

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+import json from 'rollup-plugin-json';
+
+json(); // $ExpectType Plugin

types/rollup-plugin-json/tsconfig.json

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

types/rollup-plugin-json/tslint.json

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