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response.ts
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response.ts
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import type { I18NConfig } from '../../config-shared'
import { NextURL } from '../next-url'
import { toNodeHeaders, validateURL } from '../utils'
import { NextCookies } from './cookies'
const INTERNALS = Symbol('internal response')
const REDIRECTS = new Set([301, 302, 303, 307, 308])
export class NextResponse extends Response {
[INTERNALS]: {
cookies: NextCookies
url?: NextURL
}
constructor(body?: BodyInit | null, init: ResponseInit = {}) {
super(body, init)
this[INTERNALS] = {
cookies: new NextCookies(this),
url: init.url
? new NextURL(init.url, {
headers: toNodeHeaders(this.headers),
nextConfig: init.nextConfig,
})
: undefined,
}
}
[Symbol.for('edge-runtime.inspect.custom')]() {
return {
cookies: this.cookies,
url: this.url,
// rest of props come from Response
body: this.body,
bodyUsed: this.bodyUsed,
headers: Object.fromEntries(this.headers),
ok: this.ok,
redirected: this.redirected,
status: this.status,
statusText: this.statusText,
type: this.type,
}
}
public get cookies() {
return this[INTERNALS].cookies
}
static json(body: any, init?: ResponseInit): NextResponse {
// @ts-expect-error This is not in lib/dom right now, and we can't augment it.
const response: Response = Response.json(body, init)
return new NextResponse(response.body, response)
}
static redirect(url: string | NextURL | URL, init?: number | ResponseInit) {
const status = typeof init === 'number' ? init : init?.status ?? 307
if (!REDIRECTS.has(status)) {
throw new RangeError(
'Failed to execute "redirect" on "response": Invalid status code'
)
}
const initObj = typeof init === 'object' ? init : {}
const headers = new Headers(initObj?.headers)
headers.set('Location', validateURL(url))
return new NextResponse(null, {
...initObj,
headers,
status,
})
}
static rewrite(destination: string | NextURL | URL, init?: ResponseInit) {
const headers = new Headers(init?.headers)
headers.set('x-middleware-rewrite', validateURL(destination))
return new NextResponse(null, { ...init, headers })
}
static next(init?: ResponseInit) {
const headers = new Headers(init?.headers)
headers.set('x-middleware-next', '1')
return new NextResponse(null, { ...init, headers })
}
}
interface ResponseInit extends globalThis.ResponseInit {
nextConfig?: {
basePath?: string
i18n?: I18NConfig
trailingSlash?: boolean
}
url?: string
}