### Initialize a new Elysia project

Source: https://elysiajs.com

Command to scaffold a new Elysia application using Bun.

```bash
bun create elysia app
```

--------------------------------

### Define a basic Elysia server

Source: https://elysiajs.com

Demonstrates basic routing, file serving, streaming, and WebSocket handling in a single Elysia instance.

```typescript
import { Elysia, file } from 'elysia'

new Elysia()
	.get('/', 'Hello World')
	.get('/image', file('mika.webp'))
	.get('/stream', function* () {
		yield 'Hello'
		yield 'World'
	})
	.ws('/realtime', {
		message(ws, message) {
			ws.send('got:' + message)
		}
	})
	.listen(3000)
```

--------------------------------

### Generating OpenAPI Documentation

Source: https://elysiajs.com

Automatically generate OpenAPI documentation by using the openapi plugin.

```typescript
import { Elysia } from 'elysia'
import { openapi } from '@elysia/openapi'

new Elysia()
	.use(openapi())
```

--------------------------------

### Using Auth Plugin in Elysia

Source: https://elysiajs.com

Integrate an authentication plugin into an Elysia instance to protect routes.

```typescript
import { 
Elysia
 } from 'elysia'
import { 
auth
 } from './auth'

new 
Elysia
()
	.
use
(
auth
)
	.
get
('/profile', ({ 
user
 }) => 
user
, {
        
auth
: true
	})
```

--------------------------------

### Generate OpenAPI from TypeScript

Source: https://elysiajs.com

Use the @elysia/openapi plugin to automatically generate API documentation from TypeScript types without manual annotations.

```typescript
import { Elysia } from 'elysia'
import { openapi, fromTypes } from '@elysia/openapi'

export const app = new Elysia()
	.use(
		openapi({
			// ↓ Where magic happens 
			references: fromTypes()
		})
	)
```

--------------------------------

### Defining an Auth Macro

Source: https://elysiajs.com

Create a reusable authentication macro that validates cookies and resolves user data.

```typescript
import { Elysia, t } from 'elysia'

export const auth = new Elysia()
	.macro('auth', {
		cookie: t.Object({
			ssid: t.String()
		}),
		resolve({ cookie, status }) {
			if(!cookie.ssid.value) return status(401)

			return {
				user: cookie.ssid.value
			}
		}
	})
```

--------------------------------

### Test Elysia Server with Type Safety

Source: https://elysiajs.com

Utilize Eden Treaty within Bun tests to ensure type-safe API interactions and catch schema mismatches at compile time.

```typescript
import { 
treaty
 } from '@elysia/eden'
import { 
app
 } from './index'
import { 
test
, 
expect
 } from 'bun:test'

const 
server
 = 
treaty
(
app
)


test
('should handle duplicated user', async () => {
	const { 
error
 } = await 
server
.
user
.
put
({
Argument of type '{ username: string; }' is not assignable to parameter of type '{ username: string; password: string; }'.
  Property 'password' is missing in type '{ username: string; }' but required in type '{ username: string; password: string; }'.
	    
username
: 'mika',
	})

	
expect
(
error
?.
value
).
toEqual
({
		
success
: false,
		
message
: 'Username already taken'
	})
})
```

--------------------------------

### Client-Server Communication with Eden

Source: https://elysiajs.com

Share types between client and server using treaty to ensure type-safe API calls.

```typescript
import { 
treaty
 } from '@elysia/eden'
import type { 
App
 } from 'server'

const 
api
 = 
treaty
<
App
>('api.elysiajs.com')

const { 
data
 } = await 
api
.profile.patch({
    
age
: 21
})
```

--------------------------------

### Validate request body with schema

Source: https://elysiajs.com

Uses Elysia's type system to validate and normalize incoming request bodies, specifically for file uploads.

```typescript
import { 
Elysia
, 
t
 } from 'elysia'

new 
Elysia
()
	.
put
('/', ({ 
body
: { 
file
 } }) => 
file
, {
		
body
: 
t
.
Object
({
			
file
: 
t
.
File
({ 
type
: 'image' })
		})
	})
```

--------------------------------

### Validate Request Body with Multiple Libraries

Source: https://elysiajs.com

Elysia supports various validation libraries like TypeBox, Zod, Valibot, ArkType, and Effect for request body validation with full type inference.

```ts
import { Elysia, t } from 'elysia'


new Elysia()
	// Try hover body  ↓
	.post('/user', ({ body }) => body, {
		body: t.Object({
			name: t.Literal('SaltyAom'),
			age: t.Number(),
			friends: t.Array(t.String())
		})
	})
```

```ts
import { Elysia } from 'elysia'
import { z } from 'zod'

new Elysia()
	// Try hover body  ↓
	.post('/user', ({ body }) => body, {
		body: z.object({
			name: z.literal('SaltyAom'),
			age: z.number(),
			friends: z.array(z.string())
		})
	})
```

```ts
import { Elysia } from 'elysia'
import * as v from 'valibot'

new Elysia()
	// Try hover body  ↓
	.post('/user', ({ body }) => body, {
		body: v.object({
			name: v.literal('SaltyAom'),
			age: v.number(),
			friends: v.array(v.string())
		})
	})
```

```ts
import { Elysia } from 'elysia'
import { type } from 'arktype'

new Elysia()
	// Try hover body  ↓
	.post('/user', ({ body }) => body, {
		body: type({
			name: '"Elysia"',
			age: 'number',
			friends: 'string[]'
		})
	})
```

```ts
import { Elysia } from 'elysia'
import { Schema } from 'effect'

new Elysia()
	// Try hover body  ↓
	.post('/user', ({ body }) => body, {
		body: Schema.standardSchemaV1(
			Schema.Struct({
				name: Schema.Literal('Elysia'),
				age: Schema.Number,
				friends: Schema.Array(Schema.String)
			})
		)
	})
```

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