Create definitions for gulp-jasmine@2.4 (#21431)

* Create definitions for gulp-jasmine@2.4

* Fix the 'reporter' property

Functionality:
 - Make the secondary type of the 'reporter' property in JasmineOptions ReadonlyArray<jasmine.CustomReporter> instead of jasmine.CustomReporter[].

Tests:
 - Add some more tests

Testing done: npm run lint gulp-jasmine (with and without the change to verify the tests fail properly)

* Remove unnecessary empty namespace.

types/gulp-jasmine/gulp-jasmine-tests.ts

@@ -0,0 +1,20 @@
+import gulpJasmine = require("gulp-jasmine");
+import jasmine = require("jasmine");
+
+const dummyReporter: jasmine.CustomReporter = {};
+
+gulpJasmine(); // $ExpectType ReadWriteStream
+gulpJasmine({});
+gulpJasmine({
+    verbose: true,
+    includeStackTrace: true,
+    reporter: dummyReporter,
+    timeout: 1000,
+    errorOnFail: false,
+    config: {}
+});
+gulpJasmine({ reporter: [dummyReporter, dummyReporter] });
+const readonlyDummyReporters: ReadonlyArray<jasmine.CustomReporter> = [
+    dummyReporter, dummyReporter
+];
+gulpJasmine({ reporter: readonlyDummyReporters });

types/gulp-jasmine/index.d.ts

@@ -0,0 +1,50 @@
+// Type definitions for gulp-jasmine 2.4
+// Project: https://github.com/sindresorhus/gulp-jasmine#readme
+// Definitions by: Andrey Lalev <https://github.com/andypyrope>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+/// <reference types="node" />
+/// <reference types="jasmine" />
+
+interface JasmineOptions {
+    /**
+     *  Display spec names in default reporter.
+     */
+    verbose?: boolean;
+
+    /**
+     * Include stack traces in failures in default reporter.
+     * @default false
+     */
+    includeStackTrace?: boolean;
+
+    /**
+     * Reporter(s) to use.
+     */
+    reporter?: jasmine.CustomReporter | ReadonlyArray<jasmine.CustomReporter>;
+
+    /**
+     * Time to wait in milliseconds before a test automatically fails.
+     * @default 5000
+     */
+    timeout?: number;
+
+    /**
+     * Stops the stream on failed tests.
+     * @default true
+     */
+    errorOnFail?: boolean;
+
+    /**
+     * Passes the config to Jasmine's loadConfig method.
+     */
+    config?: object;
+}
+
+/**
+ * Executes Jasmine tests. Emits a 'jasmineDone' event on success.
+ * @param options Optional options for the execution of the Jasmine test
+ */
+declare function gulpJasmine(options?: JasmineOptions): NodeJS.ReadWriteStream;
+export = gulpJasmine;

types/gulp-jasmine/tsconfig.json

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

types/gulp-jasmine/tslint.json

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