started to convert to typescript

back/system/Logger.ts

@@ -0,0 +1,42 @@
+class Logger {
+    constructor() {
+
+    }
+
+    log(...content): void {
+        // console.log(this._prefix("log"), content);
+    }
+
+    warn(...content): void {
+        // console.warn(this._prefix("warn"), content);
+    }
+
+    error(...content): void {
+        // console.error(this._prefix("err"), content);
+    }
+
+    _prefix(type: string): string {
+        let typeStr = "";
+        switch (type) {
+            case "log":
+                typeStr = "LOG"
+                break;
+            case "warn":
+                typeStr = "WARN"
+                break;
+            case "err":
+                typeStr = "ERR"
+                break;
+            default:
+                break;
+        }
+        return `[${typeStr}: ${this._timestamp()}]`;
+    }
+
+    _timestamp() {
+        return new Date().toLocaleString();
+    }
+}
+
+const logger = new Logger();
+export default logger;