feat(karma-json-to-file-reporter): add type definition (#42735)

- type definitions
- tests

https://www.npmjs.com/package/karma-json-to-file-reporter#config

Thanks!

types/karma-json-to-file-reporter/index.d.ts

@@ -0,0 +1,42 @@
+// Type definitions for karma-json-to-file-reporter 1.0
+// Project: https://github.com/HarryBurns/karma-json-to-file-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 {
+        /**
+         * see {@link https://www.npmjs.com/package/karma-json-to-file-reporter#config}
+         */
+        jsonToFileReporter?: JsonToFileReporterOptions;
+    }
+
+    /**
+     * JSON messages logged via console.log(_) will be filtered
+     * and saved to local json file you specified in config.
+     */
+    interface JsonToFileReporterOptions {
+        /** Path for your json output file. By default it will save your files in the root of your project. */
+        outputPath?: string;
+        /**
+         * File name pattern. You can use wildcards:
+         * `*timestamp*` - for current karma run timestamp.
+         * `*index*` - for log entry index: 1, 2, 3, etc.
+         * @default 'logFile_start-timestamp.json'
+         */
+        fileName?: string;
+        /**
+         * Set it true to overwrite files if it already exists. If false, log entries will be added to the end
+         */
+        overwrite?: boolean;
+        /**
+         * Filter for json objects. This option can be:
+         * - string - filter JSONs by field on the root level
+         * - predicate function
+         */
+        filter?: string | ((obj: object) => boolean);
+    }
+}

types/karma-json-to-file-reporter/karma-json-to-file-reporter-tests.ts

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+import karma = require('karma');
+
+// Mocha reporter options tests
+const mochaReporter: karma.JsonToFileReporterOptions = {
+    outputPath: 'tests/out/',
+};
+
+module.exports = (config: karma.Config) => {
+    config.set({
+        jsonToFileReporter: {
+            outputPath: 'tests/out/',
+        },
+        plugins: ['karma-json-to-file-reporter'],
+        reporters: ['json-to-file'],
+    });
+};

types/karma-json-to-file-reporter/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
+    },
+    "files": [
+        "index.d.ts",
+        "karma-json-to-file-reporter-tests.ts"
+    ]
+}

types/karma-json-to-file-reporter/tslint.json

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