Replace Writer abstract class with interface

src/types.ts

@@ -25,19 +25,8 @@ export type WriterOptions = {
     [key: string | number | symbol]: any,
 }
 
-export abstract class Writer {
-    protected readonly _options: WriterOptions = {
-        minLevel: Level.INFO,
-        with_color: false,
-    }
-
-    public log(level: Level, ...data: any[]) : void {
-        if (level < this.options.minLevel) return
-        this.write(level, ...data)
-    }
-    protected abstract write(level: Level, ...data: any[]) : void;
-
-    public get options() : WriterOptions {
-        return this._options
-    }
+export interface Writer {
+    log(level: Level, ...data: any[]) : void;
+    get options() : WriterOptions;
+    readonly _options: WriterOptions;
 }