init Counter writer

index.ts

@@ -0,0 +1,33 @@
+import logger, {Writer, Level} from 'log'
+
+export * as log from 'log'
+export default logger
+
+export class Counter extends Writer {
+    private readonly calls = {
+        debug: 0,
+        trace: 0,
+        info: 0,
+        warn: 0,
+        error: 0,
+    }
+
+    public constructor() {
+        super({minLevel: Level.DEBUG, with_color: false});
+    }
+
+    protected write(level: Level, ..._data: any[]): void {
+        switch (level) {
+            case Level.DEBUG: this.calls.debug++; break
+            case Level.TRACE: this.calls.trace++; break
+            case Level.INFO: this.calls.info++; break
+            case Level.WARNING: this.calls.warn++; break
+            case Level.ERROR: this.calls.error++; break
+            default: throw new Error(`Unknown level: ${level}`)
+        }
+    }
+
+    public get count() {
+        return this.calls
+    }
+}