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function log(target: any, property: string, descriptor: PropertyDescriptor) {
    let method = descriptor.value;
    descriptor.value = function() {
        console.warn(`[RUNNING]: ${property}`);
        method.apply(this, arguments);
    }
}

class Handlers {
    @log
    static handler(_: any, res: any): void { 
        res.send("Hello ts-node!");
    }
}

{
  "compilerOptions": {
    "experimentalDecorators": true
  }
}