fix(karma): missing browserConsoleLogOptions configuration option (#42393)

- definition amended
- test updated

Thanks!

types/karma/index.d.ts

@@ -3,6 +3,7 @@
 // Definitions by: Tanguy Krotoff <https://github.com/tkrotoff>
 //                 James Garbutt <https://github.com/43081j>
 //                 Yaroslav Admin <https://github.com/devoto13>
+//                 Piotr Błażejewicz <https://github.com/peterblazejewicz>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 3.2
 
@@ -164,6 +165,10 @@ export interface ConfigOptions {
      * the <code>__dirname</code> of the configuration file.
      */
     basePath?: string;
+    /**
+     * Configure how the browser console is logged with the following properties, all of which are optional
+     */
+    browserConsoleLogOptions?: BrowserConsoleLogOptions;
     /**
      * @default 2000
      * @description How long does Karma wait for a browser to reconnect (in ms).
@@ -474,6 +479,21 @@ export interface CustomLauncher {
     platform?: string;
 }
 
+export interface BrowserConsoleLogOptions {
+    /** the desired log-level, where level log always is logged */
+    level?: 'log' | 'error' | 'warn' | 'info' | 'debug';
+    /**
+     * The format is a string where `%b`, `%t`, `%T`, and `%m` are replaced with the browser string,
+     * log type in lower-case, log type in uppercase, and log message, respectively.
+     * This format will only effect the output file
+     */
+    format?: string;
+    /** output-path of the output-file */
+    path?: string;
+    /** if the log should be written in the terminal, or not */
+    terminal?: boolean;
+}
+
 export namespace config {
     function parseConfig(configFilePath: string, cliOptions: ConfigOptions): Config;
 }

types/karma/karma-tests.ts

@@ -100,7 +100,13 @@ module.exports = (config: karma.Config) => {
     },
 
     singleRun: true,
-    restartOnFileChange: true
+    restartOnFileChange: true,
+    browserConsoleLogOptions: {
+        level: 'warn',
+        format: '%b %T: %m',
+        path: 'some/path/to.log',
+        terminal: false,
+    },
   });
 };