Feature/handlers upgrade (#9)

* Added isServerSide method.

* DefaultConfiguration changed to getter.

* Implemented configuration in file message handler.

* Rebuilded code.

* Added test for IsServerSide method. Rebuilded snapshots.

* Non-functional changes.

Author: GiedriusGrabauskas

@types/handlers/console-message-handler.d.ts

@@ -2,7 +2,7 @@ import { MessageHandlerBase, LogLevel, PrefixType } from "simplr-logger";
 export declare class ConsoleMessageHandler extends MessageHandlerBase {
     constructor(configuration?: Partial<ConsoleMessageHandler.Configuration>);
     private configuration;
-    private defaultConfiguration;
+    private readonly defaultConfiguration;
     private resolveLogLevelPrefix(level, colorStart);
     HandleMessage(level: LogLevel, timestamp: number, messages: any[]): void;
 }

@types/handlers/file-message-handler.d.ts

@@ -1,12 +1,20 @@
-import { MessageHandlerBase, LogLevel } from "simplr-logger";
+import { MessageHandlerBase, LogLevel, PrefixType } from "simplr-logger";
 export declare class FileMessageHandler extends MessageHandlerBase {
-    private isServerSide;
-    constructor(filePathName: string, isServerSide?: boolean | undefined);
+    constructor(filePathName: string, configuration?: Partial<FileMessageHandler.Configuration>);
     private filePathName;
+    private configuration;
+    private readonly defaultConfiguration;
     private readonly handleMessageStackCount;
     HandleMessage(level: LogLevel, timestamp: number, messages: any[]): void;
     private writeStream;
     private getWriteStream();
     private readonly EOL;
     private ensureDirectory();
 }
+export declare namespace FileMessageHandler {
+    interface Configuration {
+        LogLevelPrefix: PrefixType | keyof typeof PrefixType;
+        TimePrefix: PrefixType | keyof typeof PrefixType;
+        IsServerSide?: boolean;
+    }
+}

@types/utils/helpers.d.ts

@@ -1,5 +1,9 @@
 import { LogLevel, PrefixType } from "simplr-logger";
 export declare namespace Helpers {
+    /**
+     * Check if running on server side environment.
+     */
+    function IsServerSide(): boolean;
     /**
      * Return short name of log level.
      *