feat(open-wc/testing-karma): new type definition (#43169)

- definition file
- tests

https://github.com/open-wc/open-wc/tree/master/packages/testing-karma#extending-the-config

Thanks!

types/open-wc__testing-karma/index.d.ts

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+// Type definitions for @open-wc/testing-karma 3.3
+// Project: https://github.com/open-wc/open-wc/tree/master/packages/testing-karma
+// Definitions by: Piotr Błażejewicz <https://github.com/peterblazejewicz>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.2
+
+import karma = require('karma');
+
+/**
+ * Our configuration sets up karma to run tests based on es modules with the necessary polyfills
+ * and fallbacks for older browsers and convenient test reporting.
+ * To extend the karma config, we recommend using `deepmerge`.
+ * This will do smart merging of complex objects.
+ * You can extend any of the configuration.
+ */
+export function createDefaultConfig(config: karma.Config): karma.Config;

types/open-wc__testing-karma/open-wc__testing-karma-tests.ts

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+import { createDefaultConfig } from '@open-wc/testing-karma';
+import merge = require('lodash/merge');
+import karma = require('karma');
+
+module.exports = (config: karma.Config) => {
+    // defaults
+    const defaultConfig = createDefaultConfig(config);
+    // sets config merging defaults with custom settings
+    config.set(
+        merge(defaultConfig, {
+            logLevel: config.LOG_DEBUG,
+            basePath: '..',
+            urlRoot: '/base/',
+            frameworks: ['jasmine'],
+            files: [
+                { pattern: 'lib/angular.js', watched: false },
+                'test/unit/*.spec.js',
+                { pattern: 'compiled/index.html', watched: false },
+                { pattern: 'app/index.html', included: false, served: false },
+                { pattern: 'compiled/app.js.map', included: false, served: true, watched: false, nocache: true },
+                { pattern: 'test/images/*.jpg', watched: false, included: false, served: true, nocache: false },
+            ],
+            loggers: {
+                custom: { type: 'file', filename: 'log.txt' },
+            },
+            reporters: ['progress', 'coverage'],
+            middleware: ['foo', 'bar'],
+            beforeMiddleware: ['foo', 'bar'],
+            mime: {
+                'text/x-typescript': ['ts', 'tsx'],
+            },
+            preprocessors: {
+                'app.js': ['coverage'],
+            },
+        }),
+    );
+};

types/open-wc__testing-karma/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "paths": {
+            "@open-wc/testing-karma": [
+                "open-wc__testing-karma"
+            ]
+        }
+    },
+    "files": [
+        "index.d.ts",
+        "open-wc__testing-karma-tests.ts"
+    ]
+}

types/open-wc__testing-karma/tslint.json

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