feat(karma-junit-reporter): type definition for JUnit reporter (#42334)

- new type definition covering v2 of `karma-junit-reporter`
- tests based on documented api

Thanks!

types/karma-junit-reporter/index.d.ts

@@ -0,0 +1,34 @@
+// Type definitions for karma-junit-reporter 2.0
+// Project: https://github.com/karma-runner/karma-junit-reporter#readme
+// Definitions by: Piotr Błażejewicz (Peter Blazejewicz) <https://github.com/peterblazejewicz>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.2
+
+import 'karma';
+
+declare module 'karma' {
+    interface ConfigOptions {
+        junitReporter?: JUnitReporterConfiguration;
+    }
+
+    interface JUnitReporterConfiguration {
+        /** results will be saved as $outputDir/$browserName.xml */
+        outputDir?: string;
+        /** if included, results will be saved as $outputDir/$browserName/$outputFile */
+        outputFile?: string;
+        /** suite will become the package name attribute in xml testsuite element */
+        suite?: string;
+        /** add browser name to report and classes names */
+        useBrowserName?: boolean;
+        /** function (browser, result) to customize the name attribute in xml testcase element */
+        nameFormatter?: (browser: any, result: any) => string;
+        /** function (browser, result) to customize the classname attribute in xml testcase element */
+        classNameFormatter?: (browser: any, result: any) => string;
+        /** key value pair of properties to add to the <properties> section of the report */
+        properties?: {
+            [key: string]: any;
+        };
+        /** use '1' if reporting to be per SonarQube 6.2 XML format */
+        xmlVersion?: number | null;
+    }
+}

types/karma-junit-reporter/karma-junit-reporter-tests.ts

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+import karma = require('karma');
+
+// See https://github.com/karma-runner/karma-coverage/blob/v1.1.2/README.md#basic
+module.exports = (config: karma.Config) => {
+    config.set({
+        files: ['src/**/*.js', 'test/**/*.js'],
+
+        // coverage reporter generates the coverage
+        reporters: ['progress', 'coverage', 'junit'],
+
+        preprocessors: {
+            // source files, that you wanna generate coverage for
+            // do not include tests or libraries
+            // (these files will be instrumented by Istanbul)
+            'src/**/*.js': ['coverage'],
+        },
+
+        // the default configuration
+        junitReporter: {
+            outputDir: 'junit',
+            outputFile: 'test-resutls.xml',
+            suite: 'tests',
+            useBrowserName: true,
+            nameFormatter: (browser, result) => {
+                return browser.id + '-browser';
+            },
+            classNameFormatter: (browser, result) => {
+                return browser.name + '-class';
+            },
+            properties: {
+                isValid: true,
+            },
+            xmlVersion: 1,
+        },
+    });
+};

types/karma-junit-reporter/tsconfig.json

@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "karma-junit-reporter-tests.ts"
+    ]
+}

types/karma-junit-reporter/tslint.json

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