webidl: add argumentLengthCheck guard

lib/fetch/file.js

@@ -13,9 +13,7 @@ class File extends Blob {
     // The File constructor is invoked with two or three parameters, depending
     // on whether the optional dictionary parameter is used. When the File()
     // constructor is invoked, user agents must run the following steps:
-    if (arguments.length < 2) {
-      throw new TypeError('2 arguments required')
-    }
+    webidl.argumentLengthCheck(arguments, 2, { header: 'File constructor' })
 
     fileBits = webidl.converters['sequence<BlobPart>'](fileBits)
     fileName = webidl.converters.USVString(fileName)

lib/fetch/formdata.js

@@ -23,11 +23,7 @@ class FormData {
   append (name, value, filename = undefined) {
     webidl.brandCheck(this, FormData)
 
-    if (arguments.length < 2) {
-      throw new TypeError(
-        `Failed to execute 'append' on 'FormData': 2 arguments required, but only ${arguments.length} present.`
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 2, { header: 'FormData.append' })
 
     if (arguments.length === 3 && !isBlobLike(value)) {
       throw new TypeError(
@@ -56,11 +52,7 @@ class FormData {
   delete (name) {
     webidl.brandCheck(this, FormData)
 
-    if (arguments.length < 1) {
-      throw new TypeError(
-        `Failed to execute 'delete' on 'FormData': 1 arguments required, but only ${arguments.length} present.`
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 1, { header: 'FormData.delete' })
 
     name = webidl.converters.USVString(name)
 
@@ -79,11 +71,7 @@ class FormData {
   get (name) {
     webidl.brandCheck(this, FormData)
 
-    if (arguments.length < 1) {
-      throw new TypeError(
-        `Failed to execute 'get' on 'FormData': 1 arguments required, but only ${arguments.length} present.`
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 1, { header: 'FormData.get' })
 
     name = webidl.converters.USVString(name)
 
@@ -102,11 +90,7 @@ class FormData {
   getAll (name) {
     webidl.brandCheck(this, FormData)
 
-    if (arguments.length < 1) {
-      throw new TypeError(
-        `Failed to execute 'getAll' on 'FormData': 1 arguments required, but only ${arguments.length} present.`
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 1, { header: 'FormData.getAll' })
 
     name = webidl.converters.USVString(name)
 
@@ -122,11 +106,7 @@ class FormData {
   has (name) {
     webidl.brandCheck(this, FormData)
 
-    if (arguments.length < 1) {
-      throw new TypeError(
-        `Failed to execute 'has' on 'FormData': 1 arguments required, but only ${arguments.length} present.`
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 1, { header: 'FormData.has' })
 
     name = webidl.converters.USVString(name)
 
@@ -138,11 +118,7 @@ class FormData {
   set (name, value, filename = undefined) {
     webidl.brandCheck(this, FormData)
 
-    if (arguments.length < 2) {
-      throw new TypeError(
-        `Failed to execute 'set' on 'FormData': 2 arguments required, but only ${arguments.length} present.`
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 2, { header: 'FormData.set' })
 
     if (arguments.length === 3 && !isBlobLike(value)) {
       throw new TypeError(
@@ -219,11 +195,7 @@ class FormData {
   forEach (callbackFn, thisArg = globalThis) {
     webidl.brandCheck(this, FormData)
 
-    if (arguments.length < 1) {
-      throw new TypeError(
-        `Failed to execute 'forEach' on 'FormData': 1 argument required, but only ${arguments.length} present.`
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 1, { header: 'FormData.forEach' })
 
     if (typeof callbackFn !== 'function') {
       throw new TypeError(

lib/fetch/headers.js

@@ -175,11 +175,7 @@ class Headers {
   append (name, value) {
     webidl.brandCheck(this, Headers)
 
-    if (arguments.length < 2) {
-      throw new TypeError(
-        `Failed to execute 'append' on 'Headers': 2 arguments required, but only ${arguments.length} present.`
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 2, { header: 'Headers.append' })
 
     name = webidl.converters.ByteString(name)
     value = webidl.converters.ByteString(value)
@@ -227,11 +223,7 @@ class Headers {
   delete (name) {
     webidl.brandCheck(this, Headers)
 
-    if (arguments.length < 1) {
-      throw new TypeError(
-        `Failed to execute 'delete' on 'Headers': 1 argument required, but only ${arguments.length} present.`
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 1, { header: 'Headers.delete' })
 
     name = webidl.converters.ByteString(name)
 
@@ -276,11 +268,7 @@ class Headers {
   get (name) {
     webidl.brandCheck(this, Headers)
 
-    if (arguments.length < 1) {
-      throw new TypeError(
-        `Failed to execute 'get' on 'Headers': 1 argument required, but only ${arguments.length} present.`
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 1, { header: 'Headers.get' })
 
     name = webidl.converters.ByteString(name)
 
@@ -302,11 +290,7 @@ class Headers {
   has (name) {
     webidl.brandCheck(this, Headers)
 
-    if (arguments.length < 1) {
-      throw new TypeError(
-        `Failed to execute 'has' on 'Headers': 1 argument required, but only ${arguments.length} present.`
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 1, { header: 'Headers.has' })
 
     name = webidl.converters.ByteString(name)
 
@@ -328,11 +312,7 @@ class Headers {
   set (name, value) {
     webidl.brandCheck(this, Headers)
 
-    if (arguments.length < 2) {
-      throw new TypeError(
-        `Failed to execute 'set' on 'Headers': 2 arguments required, but only ${arguments.length} present.`
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 2, { header: 'Headers.set' })
 
     name = webidl.converters.ByteString(name)
     value = webidl.converters.ByteString(value)
@@ -421,11 +401,7 @@ class Headers {
   forEach (callbackFn, thisArg = globalThis) {
     webidl.brandCheck(this, Headers)
 
-    if (arguments.length < 1) {
-      throw new TypeError(
-        `Failed to execute 'forEach' on 'Headers': 1 argument required, but only ${arguments.length} present.`
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 1, { header: 'Headers.forEach' })
 
     if (typeof callbackFn !== 'function') {
       throw new TypeError(

lib/fetch/index.js

@@ -57,6 +57,7 @@ const { isErrored, isReadable } = require('../core/util')
 const { dataURLProcessor, serializeAMimeType } = require('./dataURL')
 const { TransformStream } = require('stream/web')
 const { getGlobalDispatcher } = require('../../index')
+const { webidl } = require('./webidl')
 
 /** @type {import('buffer').resolveObjectURL} */
 let resolveObjectURL
@@ -122,11 +123,7 @@ class Fetch extends EE {
 
 // https://fetch.spec.whatwg.org/#fetch-method
 async function fetch (input, init = {}) {
-  if (arguments.length < 1) {
-    throw new TypeError(
-      `Failed to execute 'fetch' on 'Window': 1 argument required, but only ${arguments.length} present.`
-    )
-  }
+  webidl.argumentLengthCheck(arguments, 1, { header: 'globalThis.fetch' })
 
   // 1. Let p be a new promise.
   const p = createDeferredPromise()

lib/fetch/request.js

@@ -45,11 +45,7 @@ class Request {
       return
     }
 
-    if (arguments.length < 1) {
-      throw new TypeError(
-        `Failed to construct 'Request': 1 argument required, but only ${arguments.length} present.`
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 1, { header: 'Request constructor' })
 
     input = webidl.converters.RequestInfo(input)
     init = webidl.converters.RequestInit(init)

lib/fetch/response.js

@@ -50,11 +50,7 @@ class Response {
 
   // https://fetch.spec.whatwg.org/#dom-response-json
   static json (data = undefined, init = {}) {
-    if (arguments.length === 0) {
-      throw new TypeError(
-        'Failed to execute \'json\' on \'Response\': 1 argument required, but 0 present.'
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 1, { header: 'Response.json' })
 
     if (init !== null) {
       init = webidl.converters.ResponseInit(init)
@@ -87,11 +83,7 @@ class Response {
   static redirect (url, status = 302) {
     const relevantRealm = { settingsObject: {} }
 
-    if (arguments.length < 1) {
-      throw new TypeError(
-        `Failed to execute 'redirect' on 'Response': 1 argument required, but only ${arguments.length} present.`
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 1, { header: 'Response.redirect' })
 
     url = webidl.converters.USVString(url)
     status = webidl.converters['unsigned short'](status)

lib/fetch/webidl.js

@@ -39,6 +39,16 @@ webidl.brandCheck = function (V, I) {
   }
 }
 
+webidl.argumentLengthCheck = function ({ length }, min, ctx) {
+  if (length < min) {
+    throw webidl.errors.exception({
+      message: `${min} argument${min !== 1 ? 's' : ''} required, ` +
+               `but${length ? ' only' : ''} ${length} found.`,
+      ...ctx
+    })
+  }
+}
+
 // https://tc39.es/ecma262/#sec-ecmascript-data-types-and-values
 webidl.util.Type = function (V) {
   switch (typeof V) {
@@ -98,7 +108,7 @@ webidl.util.ConvertToInt = function (V, bitLength, signedness, opts = {}) {
   let x = Number(V)
 
   // 5. If x is −0, then set x to +0.
-  if (Object.is(-0, x)) {
+  if (x === 0) {
     x = 0
   }
 
@@ -156,7 +166,7 @@ webidl.util.ConvertToInt = function (V, bitLength, signedness, opts = {}) {
   // 8. If x is NaN, +0, +∞, or −∞, then return +0.
   if (
     Number.isNaN(x) ||
-    Object.is(0, x) ||
+    (x === 0 && Object.is(0, x)) ||
     x === Number.POSITIVE_INFINITY ||
     x === Number.NEGATIVE_INFINITY
   ) {

lib/fileapi/filereader.js

@@ -39,11 +39,7 @@ class FileReader extends EventTarget {
   readAsArrayBuffer (blob) {
     webidl.brandCheck(this, FileReader)
 
-    if (arguments.length === 0) {
-      throw new TypeError(
-        'Failed to execute \'readAsArrayBuffer\' on \'FileReader\': 1 argument required, but 0 present.'
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 1, { header: 'FileReader.readAsArrayBuffer' })
 
     blob = webidl.converters.Blob(blob, { strict: false })
 
@@ -59,11 +55,7 @@ class FileReader extends EventTarget {
   readAsBinaryString (blob) {
     webidl.brandCheck(this, FileReader)
 
-    if (arguments.length === 0) {
-      throw new TypeError(
-        'Failed to execute \'readAsBinaryString\' on \'FileReader\': 1 argument required, but 0 present.'
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 1, { header: 'FileReader.readAsBinaryString' })
 
     blob = webidl.converters.Blob(blob, { strict: false })
 
@@ -80,11 +72,7 @@ class FileReader extends EventTarget {
   readAsText (blob, encoding = undefined) {
     webidl.brandCheck(this, FileReader)
 
-    if (arguments.length === 0) {
-      throw new TypeError(
-        'Failed to execute \'readAsText\' on \'FileReader\': 1 argument required, but 0 present.'
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 1, { header: 'FileReader.readAsText' })
 
     blob = webidl.converters.Blob(blob, { strict: false })
 
@@ -104,11 +92,7 @@ class FileReader extends EventTarget {
   readAsDataURL (blob) {
     webidl.brandCheck(this, FileReader)
 
-    if (arguments.length === 0) {
-      throw new TypeError(
-        'Failed to execute \'readAsDataURL\' on \'FileReader\': 1 argument required, but 0 present.'
-      )
-    }
+    webidl.argumentLengthCheck(arguments, 1, { header: 'FileReader.readAsDataURL' })
 
     blob = webidl.converters.Blob(blob, { strict: false })
 

types/webidl.d.ts

@@ -205,4 +205,9 @@ export interface Webidl {
   nullableConverter <T>(
     converter: Converter<T>
   ): (V: unknown) => ReturnType<typeof converter> | null
+
+  argumentLengthCheck (args: { length: number }, min: number, context: {
+    header: string
+    message?: string
+  }): void
 }