Enable strict mode for extension build

ext/src/lib/logger.ts

@@ -0,0 +1,19 @@
+"use strict";
+
+export class Logger {
+    constructor (private prefix: string) {}
+
+    log (message: string) {
+        console.log(`${this.prefix} (Log): ${message}`);
+    }
+    debug (message: string) {
+        console.debug(`${this.prefix} (Debug): ${message}`);
+    }
+    error (message: string) {
+        const formattedMessage = `${this.prefix} (Error): ${message}`;
+        console.error(formattedMessage);
+        return new Error(formattedMessage);
+    }
+}
+
+export default new Logger("fx_cast");