[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [LayerTree](./puppeteer.protocol.layertree.md) > [SnapshotId](./puppeteer.protocol.layertree.snapshotid.md) ## Protocol.LayerTree.SnapshotId type Unique snapshot identifier. Signature: ```typescript export type SnapshotId = string; ```