[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [ServiceWorker](./puppeteer.protocol.serviceworker.md) > [ServiceWorkerVersion](./puppeteer.protocol.serviceworker.serviceworkerversion.md) > [scriptLastModified](./puppeteer.protocol.serviceworker.serviceworkerversion.scriptlastmodified.md) ## Protocol.ServiceWorker.ServiceWorkerVersion.scriptLastModified property The Last-Modified header value of the main script. Signature: ```typescript scriptLastModified?: number; ```