replace instanceof in brand checks with isPrototypeOf

lib/web/cache/cache.js

@@ -4,7 +4,7 @@ const { kConstruct } = require('../../core/symbols')
 const { urlEquals, getFieldValues } = require('./util')
 const { kEnumerableProperty, isDisturbed } = require('../../core/util')
 const { webidl } = require('../fetch/webidl')
-const { Response, cloneResponse, fromInnerResponse, getResponseState } = require('../fetch/response')
+const { cloneResponse, fromInnerResponse, getResponseState } = require('../fetch/response')
 const { Request, fromInnerRequest, getRequestState } = require('../fetch/request')
 const { fetching } = require('../fetch/index')
 const { urlIsHttpHttpsScheme, createDeferredPromise, readAllBytes } = require('../fetch/util')
@@ -268,7 +268,7 @@ class Cache {
     let innerRequest = null
 
     // 2.
-    if (request instanceof Request) {
+    if (webidl.is.Request(request)) {
       innerRequest = getRequestState(request)
     } else { // 3.
       innerRequest = getRequestState(new Request(request))
@@ -400,7 +400,7 @@ class Cache {
      */
     let r = null
 
-    if (request instanceof Request) {
+    if (webidl.is.Request(request)) {
       r = getRequestState(request)
 
       if (r.method !== 'GET' && !options.ignoreMethod) {
@@ -466,7 +466,7 @@ class Cache {
     // 2.
     if (request !== undefined) {
       // 2.1
-      if (request instanceof Request) {
+      if (webidl.is.Request(request)) {
         // 2.1.1
         r = getRequestState(request)
 
@@ -748,7 +748,7 @@ class Cache {
 
     // 2.
     if (request !== undefined) {
-      if (request instanceof Request) {
+      if (webidl.is.Request(request)) {
         // 2.1.1
         r = getRequestState(request)
 
@@ -847,7 +847,10 @@ webidl.converters.MultiCacheQueryOptions = webidl.dictionaryConverter([
   }
 ])
 
-webidl.converters.Response = webidl.interfaceConverter(Response)
+webidl.converters.Response = webidl.interfaceConverter(
+  webidl.is.Response,
+  'Response'
+)
 
 webidl.converters['sequence<RequestInfo>'] = webidl.sequenceConverter(
   webidl.converters.RequestInfo

lib/web/cookies/index.js

@@ -5,9 +5,7 @@ const { stringify } = require('./util')
 const { webidl } = require('../fetch/webidl')
 const { Headers } = require('../fetch/headers')
 
-const headersToBrandCheck = globalThis.Headers
-  ? [Headers, globalThis.Headers]
-  : [Headers]
+const brandChecks = webidl.brandCheckMultiple([Headers, globalThis.Headers].filter(Boolean))
 
 /**
  * @typedef {Object} Cookie
@@ -30,7 +28,7 @@ const headersToBrandCheck = globalThis.Headers
 function getCookies (headers) {
   webidl.argumentLengthCheck(arguments, 1, 'getCookies')
 
-  webidl.brandCheckMultiple(headers, headersToBrandCheck)
+  brandChecks(headers)
 
   const cookie = headers.get('cookie')
 
@@ -57,7 +55,7 @@ function getCookies (headers) {
  * @returns {void}
  */
 function deleteCookie (headers, name, attributes) {
-  webidl.brandCheckMultiple(headers, headersToBrandCheck)
+  brandChecks(headers)
 
   const prefix = 'deleteCookie'
   webidl.argumentLengthCheck(arguments, 2, prefix)
@@ -82,7 +80,7 @@ function deleteCookie (headers, name, attributes) {
 function getSetCookies (headers) {
   webidl.argumentLengthCheck(arguments, 1, 'getSetCookies')
 
-  webidl.brandCheckMultiple(headers, headersToBrandCheck)
+  brandChecks(headers)
 
   const cookies = headers.getSetCookie()
 
@@ -101,7 +99,7 @@ function getSetCookies (headers) {
 function setCookie (headers, cookie) {
   webidl.argumentLengthCheck(arguments, 2, 'setCookie')
 
-  webidl.brandCheckMultiple(headers, headersToBrandCheck)
+  brandChecks(headers)
 
   cookie = webidl.converters.Cookie(cookie)
 

lib/web/fetch/body.js

@@ -39,9 +39,9 @@ function extractBody (object, keepalive = false) {
   let stream = null
 
   // 2. If object is a ReadableStream object, then set stream to object.
-  if (object instanceof ReadableStream) {
+  if (webidl.is.ReadableStream(object)) {
     stream = object
-  } else if (object instanceof Blob) {
+  } else if (webidl.is.Blob(object)) {
     // 3. Otherwise, if object is a Blob object, set stream to the
     //    result of running object’s get stream.
     stream = object.stream()
@@ -64,7 +64,7 @@ function extractBody (object, keepalive = false) {
   }
 
   // 5. Assert: stream is a ReadableStream object.
-  assert(stream instanceof ReadableStream)
+  assert(webidl.is.ReadableStream(stream))
 
   // 6. Let action be null.
   let action = null
@@ -86,7 +86,7 @@ function extractBody (object, keepalive = false) {
 
     // Set type to `text/plain;charset=UTF-8`.
     type = 'text/plain;charset=UTF-8'
-  } else if (object instanceof URLSearchParams) {
+  } else if (webidl.is.URLSearchParams(object)) {
     // URLSearchParams
 
     // spec says to run application/x-www-form-urlencoded on body.list
@@ -109,7 +109,7 @@ function extractBody (object, keepalive = false) {
 
     // Set source to a copy of the bytes held by object.
     source = new Uint8Array(object.buffer.slice(object.byteOffset, object.byteOffset + object.byteLength))
-  } else if (object instanceof FormData) {
+  } else if (webidl.is.FormData(object)) {
     const boundary = `----formdata-undici-0${`${Math.floor(Math.random() * 1e11)}`.padStart(11, '0')}`
     const prefix = `--${boundary}\r\nContent-Disposition: form-data`
 
@@ -178,7 +178,7 @@ function extractBody (object, keepalive = false) {
     // followed by the multipart/form-data boundary string generated
     // by the multipart/form-data encoding algorithm.
     type = `multipart/form-data; boundary=${boundary}`
-  } else if (object instanceof Blob) {
+  } else if (webidl.is.Blob(object)) {
     // Blob
 
     // Set source to object.
@@ -206,7 +206,7 @@ function extractBody (object, keepalive = false) {
     }
 
     stream =
-      object instanceof ReadableStream ? object : ReadableStreamFrom(object)
+      webidl.is.ReadableStream(object) ? object : ReadableStreamFrom(object)
   }
 
   // 11. If source is a byte sequence, then set action to a
@@ -265,7 +265,7 @@ function safelyExtractBody (object, keepalive = false) {
   // a byte sequence or BodyInit object object, run these steps:
 
   // 1. If object is a ReadableStream object, then:
-  if (object instanceof ReadableStream) {
+  if (webidl.is.ReadableStream(object)) {
     // Assert: object is neither disturbed nor locked.
     // istanbul ignore next
     assert(!util.isDisturbed(object), 'The body has already been consumed.')

lib/web/fetch/formdata-parser.js

@@ -4,6 +4,7 @@ const { isUSVString, bufferToLowerCasedHeaderName } = require('../../core/util')
 const { utf8DecodeBytes } = require('./util')
 const { HTTP_TOKEN_CODEPOINTS, isomorphicDecode } = require('./data-url')
 const { makeEntry } = require('./formdata')
+const { webidl } = require('./webidl')
 const assert = require('node:assert')
 const { File: NodeFile } = require('node:buffer')
 
@@ -204,7 +205,7 @@ function multipartFormDataParser (input, mimeType) {
 
     // 5.12. Assert: name is a scalar value string and value is either a scalar value string or a File object.
     assert(isUSVString(name))
-    assert((typeof value === 'string' && isUSVString(value)) || value instanceof File)
+    assert((typeof value === 'string' && isUSVString(value)) || webidl.is.File(value))
 
     // 5.13. Create an entry with name and value, and append it to entry list.
     entryList.push(makeEntry(name, value, filename))

lib/web/fetch/formdata.js

@@ -31,7 +31,7 @@ class FormData {
 
     name = webidl.converters.USVString(name)
 
-    if (arguments.length === 3 || value instanceof Blob) {
+    if (arguments.length === 3 || webidl.is.Blob(value)) {
       value = webidl.converters.Blob(value, prefix, 'value')
 
       if (filename !== undefined) {
@@ -122,7 +122,7 @@ class FormData {
 
     name = webidl.converters.USVString(name)
 
-    if (arguments.length === 3 || value instanceof Blob) {
+    if (arguments.length === 3 || webidl.is.Blob(value)) {
       value = webidl.converters.Blob(value, prefix, 'value')
 
       if (filename !== undefined) {
@@ -235,7 +235,7 @@ function makeEntry (name, value, filename) {
 
     // 1. If value is not a File object, then set value to a new File object,
     //    representing the same bytes, whose name attribute value is "blob"
-    if (!(value instanceof File)) {
+    if (!webidl.is.File(value)) {
       value = new File([value], 'blob', { type: value.type })
     }
 
@@ -256,4 +256,6 @@ function makeEntry (name, value, filename) {
   return { name, value }
 }
 
+webidl.is.FormData = webidl.util.MakeTypeAssertion(FormData.prototype)
+
 module.exports = { FormData, makeEntry, setFormDataState }

lib/web/fetch/index.js

@@ -803,7 +803,7 @@ function schemeFetch (fetchParams) {
 
       // 2. If request’s method is not `GET`, blobURLEntry is null, or blobURLEntry’s
       //    object is not a Blob object, then return a network error.
-      if (request.method !== 'GET' || !(blob instanceof Blob)) {
+      if (request.method !== 'GET' || !webidl.is.Blob(blob)) {
         return Promise.resolve(makeNetworkError('invalid method'))
       }
 
@@ -1439,7 +1439,7 @@ async function httpNetworkOrCacheFetch (
   //    11. If httpRequest’s referrer is a URL, then append
   //    `Referer`/httpRequest’s referrer, serialized and isomorphic encoded,
   //     to httpRequest’s header list.
-  if (httpRequest.referrer instanceof URL) {
+  if (webidl.is.URL(httpRequest.referrer)) {
     httpRequest.headersList.append('referer', isomorphicEncode(httpRequest.referrer.href), true)
   }
 

lib/web/fetch/request.js

@@ -144,7 +144,7 @@ class Request {
       // 6. Otherwise:
 
       // 7. Assert: input is a Request object.
-      assert(input instanceof Request)
+      assert(webidl.is.Request(input))
 
       // 8. Set request to input’s request.
       request = input.#state
@@ -490,7 +490,7 @@ class Request {
 
     // 33. Let inputBody be input’s request’s body if input is a Request
     // object; otherwise null.
-    const inputBody = input instanceof Request ? input.#state.body : null
+    const inputBody = webidl.is.Request(input) ? input.#state.body : null
 
     // 34. If either init["body"] exists and is non-null or inputBody is
     // non-null, and request’s method is `GET` or `HEAD`, then throw a
@@ -986,23 +986,21 @@ Object.defineProperties(Request.prototype, {
   }
 })
 
+webidl.is.Request = webidl.util.MakeTypeAssertion(Request.prototype)
+
 // https://fetch.spec.whatwg.org/#requestinfo
 webidl.converters.RequestInfo = function (V, prefix, argument) {
   if (typeof V === 'string') {
     return webidl.converters.USVString(V)
   }
 
-  if (V instanceof Request) {
+  if (webidl.is.Request(V)) {
     return V
   }
 
   return webidl.converters.USVString(V)
 }
 
-webidl.converters.AbortSignal = webidl.interfaceConverter(
-  AbortSignal
-)
-
 // https://fetch.spec.whatwg.org/#requestinit
 webidl.converters.RequestInit = webidl.dictionaryConverter([
   {

lib/web/fetch/response.js

@@ -19,7 +19,6 @@ const {
   nullBodyStatus
 } = require('./constants')
 const { webidl } = require('./webidl')
-const { FormData } = require('./formdata')
 const { URLSerializer } = require('./data-url')
 const { kConstruct } = require('../../core/symbols')
 const assert = require('node:assert')
@@ -569,19 +568,19 @@ webidl.converters.XMLHttpRequestBodyInit = function (V, prefix, name) {
     return webidl.converters.USVString(V, prefix, name)
   }
 
-  if (V instanceof Blob) {
+  if (webidl.is.Blob(V)) {
     return V
   }
 
   if (ArrayBuffer.isView(V) || types.isArrayBuffer(V)) {
     return V
   }
 
-  if (V instanceof FormData) {
+  if (webidl.is.FormData(V)) {
     return V
   }
 
-  if (V instanceof URLSearchParams) {
+  if (webidl.is.URLSearchParams(V)) {
     return V
   }
 
@@ -590,7 +589,7 @@ webidl.converters.XMLHttpRequestBodyInit = function (V, prefix, name) {
 
 // https://fetch.spec.whatwg.org/#bodyinit
 webidl.converters.BodyInit = function (V, prefix, argument) {
-  if (V instanceof ReadableStream) {
+  if (webidl.is.ReadableStream(V)) {
     return V
   }
 
@@ -620,6 +619,8 @@ webidl.converters.ResponseInit = webidl.dictionaryConverter([
   }
 ])
 
+webidl.is.Response = webidl.util.MakeTypeAssertion(Response.prototype)
+
 module.exports = {
   isNetworkError,
   makeNetworkError,

lib/web/fetch/util.js

@@ -399,7 +399,7 @@ function determineRequestsReferrer (request) {
 
     // note: we need to clone it as it's mutated
     referrerSource = new URL(globalOrigin)
-  } else if (request.referrer instanceof URL) {
+  } else if (webidl.is.URL(request.referrer)) {
     // Let referrerSource be request’s referrer.
     referrerSource = request.referrer
   }
@@ -476,7 +476,7 @@ function determineRequestsReferrer (request) {
  */
 function stripURLForReferrer (url, originOnly) {
   // 1. Assert: url is a URL.
-  assert(url instanceof URL)
+  assert(webidl.is.URL(url))
 
   url = new URL(url)
 
@@ -508,7 +508,7 @@ function stripURLForReferrer (url, originOnly) {
 }
 
 function isURLPotentiallyTrustworthy (url) {
-  if (!(url instanceof URL)) {
+  if (!webidl.is.URL(url)) {
     return false
   }