# TimingVariables

**Kind:** Type

**Source:** [`src/middleware/timing/timing.ts`](https://github.com/honojs/hono/blob/main/src/middleware/timing/timing.ts#L10)

**Part of:** [Middleware](subsystem-src-middleware)

## Definition

```ts
{ metric?: { headers: string[] timers: Map<string, Timer> } }
```