# Server Timing Plugin
This plugin adds support for auditing performance bottlenecks with Server Timing API

## Installation
```bash
bun add @elysiajs/server-timing
```

## Basic Usage
```typescript twoslash
import { Elysia } from 'elysia'
import { serverTiming } from '@elysiajs/server-timing'

new Elysia()
    .use(serverTiming())
    .get('/', () => 'hello')
    .listen(3000)
```

Server Timing then will append header 'Server-Timing' with log duration, function name, and detail for each life-cycle function.

To inspect, open browser developer tools > Network > [Request made through Elysia server] > Timing.

Now you can effortlessly audit the performance bottleneck of your server.

## Config
Below is a config which is accepted by the plugin

### enabled
@default `NODE_ENV !== 'production'`

Determine whether or not Server Timing should be enabled

### allow
@default `undefined`

A condition whether server timing should be log

### trace
@default `undefined`

Allow Server Timing to log specified life-cycle events:

Trace accepts objects of the following:
- request: capture duration from request
- parse: capture duration from parse
- transform: capture duration from transform
- beforeHandle: capture duration from beforeHandle
- handle: capture duration from the handle
- afterHandle: capture duration from afterHandle
- total: capture total duration from start to finish

## Pattern
Below you can find the common patterns to use the plugin.

## Allow Condition
You may disable Server Timing on specific routes via `allow` property

```ts twoslash
import { Elysia } from 'elysia'
import { serverTiming } from '@elysiajs/server-timing'

new Elysia()
    .use(
        serverTiming({
            allow: ({ request }) => {
                return new URL(request.url).pathname !== '/no-trace'
            }
        })
    )
```