feat(karma-jsdom-launcher): new type definition package (#43031)

- type definition
- tests

https://github.com/badeball/karma-jsdom-launcher#readme

Thanks!

types/karma-jsdom-launcher/index.d.ts

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+// Type definitions for karma-jsdom-launcher 8.0
+// Project: https://github.com/badeball/karma-jsdom-launcher#readme
+// Definitions by: Piotr Błażejewicz (Peter Blazejewicz) <https://github.com/peterblazejewicz>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.2
+
+import 'karma';
+import jsdom = require('jsdom');
+
+declare module 'karma' {
+    interface ConfigOptions {
+        /**
+         * Launcher for jsdom configuration
+         */
+        jsdomLauncher?: JsdomLauncherOptions;
+    }
+
+    interface JsdomLauncherOptions {
+        /**
+         * You can pass options directly to jsdom as shown below.
+         * See jsdom's own documentation for all supported options.
+         */
+        jsdom: jsdom.ConstructorOptions;
+    }
+}

types/karma-jsdom-launcher/karma-jsdom-launcher-tests.ts

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+import karma = require('karma');
+import jsdom = require('jsdom');
+
+const resourceLoader = new jsdom.ResourceLoader({
+    proxy: 'http://127.0.0.1:9001',
+    strictSSL: false,
+    userAgent: 'Mellblomenator/9000',
+});
+const virtualConsole = new jsdom.VirtualConsole();
+const cookieJar = new jsdom.CookieJar();
+
+module.exports = (config: karma.Config) => {
+    config.set({
+        browsers: ['jsdom'],
+
+        jsdomLauncher: {
+            jsdom: {
+                resources: resourceLoader,
+                virtualConsole,
+                cookieJar,
+            },
+        },
+    });
+};

types/karma-jsdom-launcher/tsconfig.json

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

types/karma-jsdom-launcher/tslint.json

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