feat: add types for @rollup/plugin-virtual (#42688)

* feat: add types for @rollup/plugin-virtual

* chore: rm 'node' from 'types'

* chore: set typescript version to 2.9

* chore: set typescript version to 3.7

* chore: fix lint issues

types/rollup__plugin-virtual/index.d.ts

@@ -0,0 +1,21 @@
+// Type definitions for @rollup/plugin-virtual 2.0
+// Project: https://github.com/rollup/plugins/tree/master/packages/virtual#readme
+// Definitions by: ed eustace <https://github.com/ahum>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.7
+
+/// <reference types="node" />
+
+import { Plugin } from 'rollup';
+
+declare namespace virtual {
+    interface Options {
+        [filePath: string]: string;
+    }
+}
+
+/**
+ * A Rollup plugin which loads virtual modules from memory.
+ */
+declare function virtual(options?: virtual.Options): Plugin;
+export = virtual;

types/rollup__plugin-virtual/package.json

@@ -0,0 +1,6 @@
+{
+    "private": true,
+    "dependencies": {
+        "rollup": "^1.31.1"
+    }
+}

types/rollup__plugin-virtual/rollup__plugin-virtual-tests.ts

@@ -0,0 +1,6 @@
+import virtual = require('@rollup/plugin-virtual');
+
+virtual(); // $ExpectType Plugin
+
+const options: virtual.Options = { 'path/to/file': '//hi' };
+virtual(options); // $ExpectType Plugin

types/rollup__plugin-virtual/tsconfig.json

@@ -0,0 +1,26 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "paths" :  {
+                "@rollup/plugin-virtual": ["rollup__plugin-virtual"]
+        }
+    },
+    "files": [
+        "index.d.ts",
+        "rollup__plugin-virtual-tests.ts"
+    ]
+}

types/rollup__plugin-virtual/tslint.json

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