UNPKG

flags

Version:

Flags SDK by Vercel - The feature flags toolkit for Next.js and SvelteKit

1 lines • 48.5 kB

Source Map (JSON)

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\"@vitejs/plugin-react\": \"4.2.1\",\n \"msw\": \"2.6.4\",\n \"tsup\": \"8.5.1\",\n \"typescript\": \"5.6.3\",\n \"vite\": \"5.4.21\",\n \"vitest\": \"1.6.1\"\n },\n \"peerDependencies\": {\n \"@opentelemetry/api\": \"^1.7.0\",\n \"@sveltejs/kit\": \"*\",\n \"next\": \"*\",\n \"react\": \"*\",\n \"react-dom\": \"*\"\n },\n \"peerDependenciesMeta\": {\n \"@opentelemetry/api\": {\n \"optional\": true\n },\n \"@sveltejs/kit\": {\n \"optional\": true\n },\n \"next\": {\n \"optional\": true\n },\n \"react\": {\n \"optional\": true\n },\n \"react-dom\": {\n \"optional\": true\n }\n },\n \"publishConfig\": {\n \"access\": \"public\"\n }\n}\n","/**\n * All JWEs created by crypto functions will typically use the same secret.\n *\n * It is vital that each decrypt function ensures the JWE was created for that\n * specific purpose, as the output of one encrypt function could otherwise be\n * used as the input to another decrypt function.\n */\nimport { base64url, EncryptJWT, jwtDecrypt } from 'jose';\nimport type {\n FlagDefinitionsType,\n FlagOverridesType,\n FlagValuesType,\n} from '../types';\n\ntype ExpirationTime = string | number | Date;\ntype PurposeClaim = 'overrides' | 'values' | 'definitions' | 'proof';\ntype Purpose = string | string[];\n\n/**\n * Checks if a purpose claim matches the expected purpose.\n *\n * @param pur - The purpose claim to check, can be a string or array of strings\n * @param expectedPurpose - The expected purpose to match against\n * @returns True if the purpose matches the expected purpose, false otherwise\n */\nconst hasPurpose = (pur: Purpose, expectedPurpose: PurposeClaim): boolean => {\n return Array.isArray(pur)\n ? pur.includes(expectedPurpose)\n : pur === expectedPurpose;\n};\n\n/**\n * Encrypts data into a JSON Web Encryption (JWE) token.\n *\n * @param payload - The data to encrypt\n * @param secret - The encryption secret (must be a 256-bit key)\n * @param expirationTime - When the encrypted data should expire\n * @returns A promise resolving to the encrypted JWE string\n * @throws Error if the secret is invalid\n */\nasync function encryptJwe<T extends object = Record<string, unknown>>(\n payload: T,\n secret: string,\n expirationTime: ExpirationTime,\n): Promise<string> {\n const encodedSecret = base64url.decode(secret);\n\n if (encodedSecret.length !== 32) {\n throw new Error(\n 'flags: Invalid secret, it must be a 256-bit key (32 bytes)',\n );\n }\n\n return new EncryptJWT(payload as Record<string, unknown>)\n .setExpirationTime(expirationTime)\n .setProtectedHeader({ alg: 'dir', enc: 'A256GCM' })\n .encrypt(encodedSecret);\n}\n\n/**\n * Decrypts a JWE token and verifies its contents.\n *\n * @param text - The encrypted JWE token string\n * @param verify - A function to verify the decrypted payload is valid\n * @param secret - The decryption secret (must be a 256-bit key)\n * @returns A promise resolving to the decrypted data or undefined if invalid\n * @throws Error if the secret is invalid\n */\nasync function decryptJwe<T extends string | object = Record<string, unknown>>(\n text: string,\n verify: (payload: T) => boolean,\n secret: string,\n): Promise<T | undefined> {\n if (typeof text !== 'string') return;\n\n const encodedSecret = base64url.decode(secret);\n\n if (encodedSecret.length !== 32) {\n throw new Error(\n 'flags: Invalid secret, it must be a 256-bit key (32 bytes)',\n );\n }\n\n try {\n const { payload } = await jwtDecrypt(text, encodedSecret);\n const decoded = payload as T;\n return verify(decoded) ? decoded : undefined;\n } catch {\n return undefined;\n }\n}\n\n/**\n * Encrypts flag overrides data.\n *\n * @param overrides - The flag overrides to encrypt\n * @param secret - The encryption secret (defaults to FLAGS_SECRET env var)\n * @param expirationTime - When the encrypted data should expire (defaults to 1 year)\n * @returns A promise resolving to the encrypted JWE string\n * @throws Error if the secret is missing or invalid\n */\nexport async function encryptOverrides(\n overrides: FlagOverridesType,\n secret: string | undefined = process?.env?.FLAGS_SECRET,\n expirationTime: ExpirationTime = '1y',\n) {\n if (!secret) throw new Error('flags: Missing FLAGS_SECRET');\n return encryptJwe({ o: overrides, pur: 'overrides' }, secret, expirationTime);\n}\n\n/**\n * Decrypts and validates flag overrides data.\n *\n * @param encryptedData - The encrypted JWE token string\n * @param secret - The decryption secret (defaults to FLAGS_SECRET env var)\n * @returns A promise resolving to the decrypted flag overrides or undefined if invalid\n * @throws Error if the secret is missing or invalid\n */\nexport async function decryptOverrides(\n encryptedData: string,\n secret: string | undefined = process?.env?.FLAGS_SECRET,\n): Promise<FlagOverridesType | undefined> {\n if (!secret) throw new Error('flags: Missing FLAGS_SECRET');\n const contents = await decryptJwe<{\n o: FlagOverridesType;\n pur: Purpose;\n }>(\n encryptedData,\n (data) => hasPurpose(data.pur, 'overrides') && Object.hasOwn(data, 'o'),\n secret,\n );\n return contents?.o;\n}\n\n/**\n * Encrypts flag values data.\n *\n * @param flagValues - The flag values to encrypt\n * @param secret - The encryption secret (defaults to FLAGS_SECRET env var)\n * @param expirationTime - When the encrypted data should expire (defaults to 1 year)\n * @returns A promise resolving to the encrypted JWE string\n * @throws Error if the secret is missing or invalid\n */\nexport async function encryptFlagValues(\n flagValues: FlagValuesType,\n secret: string | undefined = process?.env?.FLAGS_SECRET,\n expirationTime: ExpirationTime = '1y',\n) {\n if (!secret) throw new Error('flags: Missing FLAGS_SECRET');\n return encryptJwe({ v: flagValues, pur: 'values' }, secret, expirationTime);\n}\n\n/**\n * Decrypts and validates flag values data.\n *\n * @param encryptedData - The encrypted JWE token string\n * @param secret - The decryption secret (defaults to FLAGS_SECRET env var)\n * @returns A promise resolving to the decrypted flag values or undefined if invalid\n * @throws Error if the secret is missing or invalid\n */\nexport async function decryptFlagValues(\n encryptedData: string,\n secret: string | undefined = process?.env?.FLAGS_SECRET,\n): Promise<FlagValuesType | undefined> {\n if (!secret) throw new Error('flags: Missing FLAGS_SECRET');\n const contents = await decryptJwe<{\n v: FlagValuesType;\n pur: Purpose;\n }>(\n encryptedData,\n (data) => hasPurpose(data.pur, 'values') && Object.hasOwn(data, 'v'),\n secret,\n );\n return contents?.v;\n}\n\n/**\n * Encrypts flag definitions data.\n *\n * @param flagDefinitions - The flag definitions to encrypt\n * @param secret - The encryption secret (defaults to FLAGS_SECRET env var)\n * @param expirationTime - When the encrypted data should expire (defaults to 1 year)\n * @returns A promise resolving to the encrypted JWE string\n * @throws Error if the secret is missing or invalid\n */\nexport async function encryptFlagDefinitions(\n flagDefinitions: FlagDefinitionsType,\n secret: string | undefined = process?.env?.FLAGS_SECRET,\n expirationTime: ExpirationTime = '1y',\n) {\n if (!secret) throw new Error('flags: Missing FLAGS_SECRET');\n return encryptJwe(\n { d: flagDefinitions, pur: 'definitions' },\n secret,\n expirationTime,\n );\n}\n\n/**\n * Decrypts and validates flag definitions data.\n *\n * @param encryptedData - The encrypted JWE token string\n * @param secret - The decryption secret (defaults to FLAGS_SECRET env var)\n * @returns A promise resolving to the decrypted flag definitions or undefined if invalid\n * @throws Error if the secret is missing or invalid\n */\nexport async function decryptFlagDefinitions(\n encryptedData: string,\n secret: string | undefined = process?.env?.FLAGS_SECRET,\n): Promise<FlagDefinitionsType | undefined> {\n if (!secret) throw new Error('flags: Missing FLAGS_SECRET');\n const contents = await decryptJwe<{\n d: FlagDefinitionsType;\n pur: string;\n }>(\n encryptedData,\n (data) => data.pur === 'definitions' && Object.hasOwn(data, 'd'),\n secret,\n );\n return contents?.d;\n}\n\n/**\n * Creates an access proof token.\n *\n * @param secret - The encryption secret (defaults to FLAGS_SECRET env var)\n * @param expirationTime - When the token should expire (defaults to 1 year)\n * @returns A promise resolving to the encrypted access proof token\n * @throws Error if the secret is missing or invalid\n */\nexport async function createAccessProof(\n secret: string | undefined = process?.env?.FLAGS_SECRET,\n expirationTime: ExpirationTime = '1y',\n) {\n if (!secret) throw new Error('flags: Missing FLAGS_SECRET');\n return encryptJwe({ pur: 'proof' }, secret, expirationTime);\n}\n\n/**\n * Verifies an access proof token is valid.\n *\n * @param encryptedData - The encrypted access proof token\n * @param secret - The decryption secret (defaults to FLAGS_SECRET env var)\n * @returns A promise resolving to a boolean indicating if the token is valid\n * @throws Error if the secret is missing or invalid\n */\nexport async function verifyAccessProof(\n encryptedData: string,\n secret: string | undefined = process?.env?.FLAGS_SECRET,\n) {\n if (!secret) throw new Error('flags: Missing FLAGS_SECRET');\n const contents = await decryptJwe<{\n pur: string;\n }>(encryptedData, (data) => hasPurpose(data.pur, 'proof'), secret);\n\n return Boolean(contents);\n}\n","import type { ProviderData } from '../types';\n\nexport async function mergeProviderData(\n itemsPromises: (Promise<ProviderData> | ProviderData)[],\n): Promise<ProviderData> {\n const items = await Promise.all(\n itemsPromises.map((p) => Promise.resolve(p).catch(() => null)),\n );\n\n return items\n .filter((item): item is ProviderData => Boolean(item))\n .reduce<ProviderData>(\n (acc, item) => {\n Object.entries(item.definitions).forEach(([key, definition]) => {\n if (!acc.definitions[key]) acc.definitions[key] = {};\n Object.assign(acc.definitions[key], definition);\n });\n\n if (Array.isArray(item.hints)) acc.hints.push(...item.hints);\n\n return acc;\n },\n { definitions: {}, hints: [] },\n );\n}\n","import { version } from '../../package.json';\n\n/**\n * This function lets you report the value of a resolved flag, which will make it available when viewing Monitoring, Logs, Analytics and Speed Insights on Vercel.\n * It's important to note that this only has effects when running on Vercel in a preview or production environments, but not during local development.\n *\n * @example Using `reportValue` to report a flag value.\n * ```\n * import { type NextRequest, NextResponse } from \"next/server\";\n * import { reportValue } from 'flags';\n *\n * export async function GET(request: NextRequest) {\n * reportValue('my-flag', true);\n * return NextResponse.json({});\n * }\n * ```\n *\n * @param key the name of the flag\n * @param value the resolved value of the flag\n */\nexport function reportValue(key: string, value: unknown) {\n const symbol = Symbol.for('@vercel/request-context');\n const ctx = Reflect.get(globalThis, symbol)?.get();\n ctx?.flags?.reportValue(key, value, {\n sdkVersion: version,\n });\n}\n\n/**\n * Only used interally for now.\n */\nexport function internalReportValue(\n key: string,\n value: unknown,\n data: {\n originProjectId?: string;\n originProvider?: 'vercel';\n reason?: 'override';\n },\n) {\n const symbol = Symbol.for('@vercel/request-context');\n const ctx = Reflect.get(globalThis, symbol)?.get();\n ctx?.flags?.reportValue(key, value, {\n sdkVersion: version,\n ...data,\n });\n}\n","import type {\n Attributes,\n AttributeValue,\n Tracer,\n TracerProvider,\n} from '@opentelemetry/api';\nimport { AsyncLocalStorage } from 'async_hooks';\nimport { name as pkgName, version } from '../../package.json';\n\n// Use a symbol to avoid having global variable that is scoped to this file,\n// as it can lead to issues with cjs and mjs being used at the same time.\nconst vercelFlagsTraceSymbol = Symbol.for('flags:global-trace');\n\n/**\n * Allows setting the `@opentelemetry/api` tracer provider to generate traces\n * for `flags` operations.\n */\nexport function setTracerProvider(tracer: TracerProvider): void {\n Reflect.set(globalThis, vercelFlagsTraceSymbol, tracer);\n}\n\nfunction getTracer(): Tracer | undefined {\n const maybeTraceApi = Reflect.get(globalThis, vercelFlagsTraceSymbol) as\n | undefined\n | TracerProvider;\n return maybeTraceApi?.getTracer(pkgName, version);\n}\n\nfunction isPromise<T>(p: unknown): p is Promise<T> {\n return (\n p !== null &&\n typeof p === 'object' &&\n 'then' in p &&\n typeof p.then === 'function'\n );\n}\n\nconst spanContext = new AsyncLocalStorage<Map<string, AttributeValue>>();\n\nexport function setSpanAttribute(name: string, value: AttributeValue) {\n spanContext.getStore()?.set(name, value);\n}\n\nexport function trace<F extends (...args: any) => any>(\n fn: F,\n options: {\n name: string;\n /** Defaults to `true`. If set to `false`, it'll trace regardless of `VERCEL_FLAGS_TRACE_VERBOSE`. */\n isVerboseTrace?: boolean;\n attributes?: Attributes;\n attributesSuccess?: (\n result: ReturnType<F> extends PromiseLike<infer U> ? U : ReturnType<F>,\n ) => Attributes;\n attributesError?: (error: Error) => Attributes;\n } = {\n name: fn.name,\n },\n): F {\n const traced = function (this: unknown, ...args: unknown[]): unknown {\n const tracer = getTracer();\n if (!tracer) return fn.apply(this, args);\n\n const shouldTrace =\n process.env.VERCEL_FLAGS_TRACE_VERBOSE === 'true' ||\n options.isVerboseTrace === false;\n if (!shouldTrace) return fn.apply(this, args);\n\n return spanContext.run(new Map(), () =>\n tracer.startActiveSpan(options.name, (span) => {\n if (options.attributes) span.setAttributes(options.attributes);\n\n try {\n const result = fn.apply(this, args);\n\n if (isPromise(result)) {\n result\n .then((value) => {\n if (options.attributesSuccess) {\n span.setAttributes(\n options.attributesSuccess(\n value as ReturnType<F> extends PromiseLike<infer U>\n ? U\n : ReturnType<F>,\n ),\n );\n }\n\n spanContext.getStore()?.forEach((value, key) => {\n span.setAttribute(key, value);\n });\n\n span.setStatus({ code: 1 }); // 1 = Ok\n span.end();\n })\n .catch((error) => {\n if (options.attributesError) {\n span.setAttributes(options.attributesError(error));\n }\n\n span.setStatus({\n code: 2, // 2 = Error\n message: error instanceof Error ? error.message : undefined,\n });\n\n spanContext.getStore()?.forEach((value, key) => {\n span.setAttribute(key, value);\n });\n\n span.end();\n });\n } else {\n if (options.attributesSuccess) {\n span.setAttributes(options.attributesSuccess(result));\n }\n\n spanContext.getStore()?.forEach((value, key) => {\n span.setAttribute(key, value);\n });\n\n span.setStatus({ code: 1 }); // 1 = Ok\n span.end();\n }\n\n return result as unknown;\n } catch (error: any) {\n if (options.attributesError) {\n span.setAttributes(options.attributesError(error as Error));\n }\n\n span.setStatus({\n code: 2, // 2 = Error\n message: error instanceof Error ? error.message : undefined,\n });\n\n spanContext.getStore()?.forEach((value, key) => {\n span.setAttribute(key, value);\n });\n\n span.end();\n\n throw error;\n }\n }),\n );\n };\n\n return traced as unknown as F;\n}\n","import { verifyAccessProof } from './crypto';\nimport { trace } from './tracing';\n\n/**\n * This function lets you verify whether a request to your application's .well-known/vercel/flags endpoint was made by the toolbar.\n * You can use verifyAccess to keep this endpoint private, to avoid public access of your feature flag definitions through that endpoint.\n *\n * @example Using verifyAccess in .well-known/vercel/flags to verify access and respond with unencrypted data.\n * ```\n * import { type NextRequest, NextResponse } from \"next/server\";\n * import { verifyAccess } from \"flags\";\n *\n * export async function GET(request: NextRequest) {\n * const access = await verifyAccess(request.headers.get(\"Authorization\"));\n * if (!access) return NextResponse.json(null, { status: 401 });\n *\n * return NextResponse.json({ definitions: {} })\n * }\n * ```\n * @param authHeader the Authorization header to check\n * @param secret the FLAGS_SECRET\n * @returns True when the authorization header was valid\n */\nexport const verifyAccess = trace(\n async function verifyAccess(\n // App Router returns null when a header is not defined\n // Pages Router returns undefined when a header is not defined\n // We support both so the API is slim in both cases\n authHeader: string | null | undefined,\n secret: string | undefined = process?.env?.FLAGS_SECRET,\n ) {\n if (!authHeader) return false;\n if (!secret)\n throw new Error(\n 'flags: verifyAccess was called without a secret. Please set FLAGS_SECRET environment variable.',\n );\n\n const valid = await verifyAccessProof(\n authHeader.replace(/^Bearer /i, ''),\n secret,\n );\n\n return valid;\n },\n {\n isVerboseTrace: false,\n name: 'verifyAccess',\n },\n);\n","// copied from Next.js, and reduced\n// https://github.com/vercel/next.js/tree/canary/packages/next/src/server/web/spec-extension\n// biome-ignore lint/complexity/noStaticOnlyClass: Copied over from Next.js\nexport class ReflectAdapter {\n static get<T extends object>(\n target: T,\n prop: string | symbol,\n receiver: unknown,\n ): any {\n const value = Reflect.get(target, prop, receiver);\n if (typeof value === 'function') {\n return value.bind(target);\n }\n\n return value;\n }\n\n static set<T extends object>(\n target: T,\n prop: string | symbol,\n value: any,\n receiver: any,\n ): boolean {\n return Reflect.set(target, prop, value, receiver);\n }\n\n static has<T extends object>(target: T, prop: string | symbol): boolean {\n return Reflect.has(target, prop);\n }\n\n static deleteProperty<T extends object>(\n target: T,\n prop: string | symbol,\n ): boolean {\n return Reflect.deleteProperty(target, prop);\n }\n}\n","// copied from Next.js, and reduced\n// https://github.com/vercel/next.js/tree/canary/packages/next/src/server/web/spec-extension\nimport type { IncomingHttpHeaders } from 'http';\n\nimport { ReflectAdapter } from './reflect';\n\n/**\n * @internal\n */\nclass ReadonlyHeadersError extends Error {\n constructor() {\n super(\n 'Headers cannot be modified. Read more: https://nextjs.org/docs/app/api-reference/functions/headers',\n );\n }\n\n public static callable() {\n throw new ReadonlyHeadersError();\n }\n}\n\nexport type ReadonlyHeaders = Headers & {\n /** @deprecated Method unavailable on `ReadonlyHeaders`. Read more: https://nextjs.org/docs/app/api-reference/functions/headers */\n append(...args: any[]): void;\n /** @deprecated Method unavailable on `ReadonlyHeaders`. Read more: https://nextjs.org/docs/app/api-reference/functions/headers */\n set(...args: any[]): void;\n /** @deprecated Method unavailable on `ReadonlyHeaders`. Read more: https://nextjs.org/docs/app/api-reference/functions/headers */\n delete(...args: any[]): void;\n};\nexport class HeadersAdapter extends Headers {\n private readonly headers: IncomingHttpHeaders;\n\n constructor(headers: IncomingHttpHeaders) {\n // We've already overridden the methods that would be called, so we're just\n // calling the super constructor to ensure that the instanceof check works.\n super();\n\n this.headers = new Proxy(headers, {\n get(target, prop, receiver) {\n // Because this is just an object, we expect that all \"get\" operations\n // are for properties. If it's a \"get\" for a symbol, we'll just return\n // the symbol.\n if (typeof prop === 'symbol') {\n return ReflectAdapter.get(target, prop, receiver);\n }\n\n const lowercased = prop.toLowerCase();\n\n // Let's find the original casing of the key. This assumes that there is\n // no mixed case keys (e.g. \"Content-Type\" and \"content-type\") in the\n // headers object.\n const original = Object.keys(headers).find(\n (o) => o.toLowerCase() === lowercased,\n );\n\n // If the original casing doesn't exist, return undefined.\n if (typeof original === 'undefined') return;\n\n // If the original casing exists, return the value.\n return ReflectAdapter.get(target, original, receiver);\n },\n set(target, prop, value, receiver) {\n if (typeof prop === 'symbol') {\n return ReflectAdapter.set(target, prop, value, receiver);\n }\n\n const lowercased = prop.toLowerCase();\n\n // Let's find the original casing of the key. This assumes that there is\n // no mixed case keys (e.g. \"Content-Type\" and \"content-type\") in the\n // headers object.\n const original = Object.keys(headers).find(\n (o) => o.toLowerCase() === lowercased,\n );\n\n // If the original casing doesn't exist, use the prop as the key.\n return ReflectAdapter.set(target, original ?? prop, value, receiver);\n },\n has(target, prop) {\n if (typeof prop === 'symbol') return ReflectAdapter.has(target, prop);\n\n const lowercased = prop.toLowerCase();\n\n // Let's find the original casing of the key. This assumes that there is\n // no mixed case keys (e.g. \"Content-Type\" and \"content-type\") in the\n // headers object.\n const original = Object.keys(headers).find(\n (o) => o.toLowerCase() === lowercased,\n );\n\n // If the original casing doesn't exist, return false.\n if (typeof original === 'undefined') return false;\n\n // If the original casing exists, return true.\n return ReflectAdapter.has(target, original);\n },\n deleteProperty(target, prop) {\n if (typeof prop === 'symbol')\n return ReflectAdapter.deleteProperty(target, prop);\n\n const lowercased = prop.toLowerCase();\n\n // Let's find the original casing of the key. This assumes that there is\n // no mixed case keys (e.g. \"Content-Type\" and \"content-type\") in the\n // headers object.\n const original = Object.keys(headers).find(\n (o) => o.toLowerCase() === lowercased,\n );\n\n // If the original casing doesn't exist, return true.\n if (typeof original === 'undefined') return true;\n\n // If the original casing exists, delete the property.\n return ReflectAdapter.deleteProperty(target, original);\n },\n });\n }\n\n /**\n * Seals a Headers instance to prevent modification by throwing an error when\n * any mutating method is called.\n */\n public static seal(headers: Headers): ReadonlyHeaders {\n return new Proxy<ReadonlyHeaders>(headers, {\n get(target, prop, receiver) {\n switch (prop) {\n case 'append':\n case 'delete':\n case 'set':\n return ReadonlyHeadersError.callable;\n default:\n return ReflectAdapter.get(target, prop, receiver);\n }\n },\n });\n }\n\n /**\n * Merges a header value into a string. This stores multiple values as an\n * array, so we need to merge them into a string.\n *\n * @param value a header value\n * @returns a merged header value (a string)\n */\n private merge(value: string | string[]): string {\n if (Array.isArray(value)) return value.join(', ');\n\n return value;\n }\n\n /**\n * Creates a Headers instance from a plain object or a Headers instance.\n *\n * @param headers a plain object or a Headers instance\n * @returns a headers instance\n */\n public static from(headers: IncomingHttpHeaders | Headers): Headers {\n if (headers instanceof Headers) return headers;\n\n return new HeadersAdapter(headers);\n }\n\n public append(name: string, value: string): void {\n const existing = this.headers[name];\n if (typeof existing === 'string') {\n this.headers[name] = [existing, value];\n } else if (Array.isArray(existing)) {\n existing.push(value);\n } else {\n this.headers[name] = value;\n }\n }\n\n public delete(name: string): void {\n delete this.headers[name];\n }\n\n public get(name: string): string | null {\n const value = this.headers[name];\n if (typeof value !== 'undefined') return this.merge(value);\n\n return null;\n }\n\n public has(name: string): boolean {\n return typeof this.headers[name] !== 'undefined';\n }\n\n public set(name: string, value: string): void {\n this.headers[name] = value;\n }\n\n public forEach(\n callbackfn: (value: string, name: string, parent: Headers) => void,\n thisArg?: any,\n ): void {\n for (const [name, value] of this.entries()) {\n callbackfn.call(thisArg, value, name, this);\n }\n }\n\n public *entries(): HeadersIterator<[string, string]> {\n for (const key of Object.keys(this.headers)) {\n const name = key.toLowerCase();\n // We assert here that this is a string because we got it from the\n // Object.keys() call above.\n const value = this.get(name) as string;\n\n yield [name, value] as [string, string];\n }\n }\n\n public *keys(): HeadersIterator<string> {\n for (const key of Object.keys(this.headers)) {\n const name = key.toLowerCase();\n yield name;\n }\n }\n\n public *values(): HeadersIterator<string> {\n for (const key of Object.keys(this.headers)) {\n // We assert here that this is a string because we got it from the\n // Object.keys() call above.\n const value = this.get(key) as string;\n\n yield value;\n }\n }\n\n public [Symbol.iterator](): HeadersIterator<[string, string]> {\n return this.entries();\n }\n}\n","// copied from Next.js, and reduced\n// https://github.com/vercel/next.js/tree/canary/packages/next/src/server/web/spec-extension\nimport { type RequestCookies, ResponseCookies } from '../cookies';\nimport { ReflectAdapter } from './reflect';\n\n/**\n * @internal\n */\nexport class ReadonlyRequestCookiesError extends Error {\n constructor() {\n super(\n 'Cookies can only be modified in a Server Action or Route Handler. Read more: https://nextjs.org/docs/app/api-reference/functions/cookies#options',\n );\n }\n\n public static callable() {\n throw new ReadonlyRequestCookiesError();\n }\n}\n\n// We use this to type some APIs but we don't construct instances directly\nexport type { ResponseCookies };\n\n// The `cookies()` API is a mix of request and response cookies. For `.get()` methods,\n// we want to return the request cookie if it exists. For mutative methods like `.set()`,\n// we want to return the response cookie.\nexport type ReadonlyRequestCookies = Omit<\n RequestCookies,\n 'set' | 'clear' | 'delete'\n> &\n Pick<ResponseCookies, 'set' | 'delete'>;\n\n// biome-ignore lint/complexity/noStaticOnlyClass: copied from Next.js\nexport class RequestCookiesAdapter {\n public static seal(cookies: RequestCookies): ReadonlyRequestCookies {\n return new Proxy(cookies as any, {\n get(target, prop, receiver) {\n switch (prop) {\n case 'clear':\n case 'delete':\n case 'set':\n return ReadonlyRequestCookiesError.callable;\n default:\n return ReflectAdapter.get(target, prop, receiver);\n }\n },\n });\n }\n}\n\nconst SYMBOL_MODIFY_COOKIE_VALUES = Symbol.for('next.mutated.cookies');\n\nexport function getModifiedCookieValues(\n cookies: ResponseCookies,\n): ResponseCookie[] {\n const modified: ResponseCookie[] | undefined = (cookies as unknown as any)[\n SYMBOL_MODIFY_COOKIE_VALUES\n ];\n if (!modified || !Array.isArray(modified) || modified.length === 0) {\n return [];\n }\n\n return modified;\n}\n\nexport function appendMutableCookies(\n headers: Headers,\n mutableCookies: ResponseCookies,\n): boolean {\n const modifiedCookieValues = getModifiedCookieValues(mutableCookies);\n if (modifiedCookieValues.length === 0) {\n return false;\n }\n\n // Return a new response that extends the response with\n // the modified cookies as fallbacks. `res` cookies\n // will still take precedence.\n const resCookies = new ResponseCookies(headers);\n const returnedCookies = resCookies.getAll();\n\n // Set the modified cookies as fallbacks.\n for (const cookie of modifiedCookieValues) {\n resCookies.set(cookie);\n }\n\n // Set the original cookies as the final values.\n for (const cookie of returnedCookies) {\n resCookies.set(cookie);\n }\n\n return true;\n}\n\ntype ResponseCookie = NonNullable<\n ReturnType<InstanceType<typeof ResponseCookies>['get']>\n>;\n"]}