External Libraries: Update `whatwg-fetch` package to version 3.6.2.

This matches the version used in the Gutenberg project.

While WordPress core no longer depends on this polyfill as of [50934], this brings the latest updates of the library to anyone still utilizing it.

For a full list of changes in this update, see the `whatwg-fetch` GitHub:
https://github.com/github/fetch/compare/v3.0.0...v3.6.2

Follow-up to [43719], [50934].

Props hareesh-pillai, rsiddharth, desrosj.
Fixes #53929.
Built from https://develop.svn.wordpress.org/trunk@51692


git-svn-id: http://core.svn.wordpress.org/trunk@51298 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/dist/vendor/wp-polyfill-fetch.js

@@ -4,12 +4,17 @@
   (factory((global.WHATWGFetch = {})));
 }(this, (function (exports) { 'use strict';
 
+  var global =
+    (typeof globalThis !== 'undefined' && globalThis) ||
+    (typeof self !== 'undefined' && self) ||
+    (typeof global !== 'undefined' && global);
+
   var support = {
-    searchParams: 'URLSearchParams' in self,
+    searchParams: 'URLSearchParams' in global,
-    iterable: 'Symbol' in self && 'iterator' in Symbol,
+    iterable: 'Symbol' in global && 'iterator' in Symbol,
     blob:
-      'FileReader' in self &&
+      'FileReader' in global &&
-      'Blob' in self &&
+      'Blob' in global &&
       (function() {
         try {
           new Blob();
@@ -18,8 +23,8 @@
           return false
         }
       })(),
-    formData: 'FormData' in self,
+    formData: 'FormData' in global,
-    arrayBuffer: 'ArrayBuffer' in self
+    arrayBuffer: 'ArrayBuffer' in global
   };
 
   function isDataView(obj) {
@@ -50,8 +55,8 @@
     if (typeof name !== 'string') {
       name = String(name);
     }
-    if (/[^a-z0-9\-#$%&'*+.^_`|~]/i.test(name)) {
+    if (/[^a-z0-9\-#$%&'*+.^_`|~!]/i.test(name) || name === '') {
-      throw new TypeError('Invalid character in header field name')
+      throw new TypeError('Invalid character in header field name: "' + name + '"')
     }
     return name.toLowerCase()
   }
@@ -215,6 +220,17 @@
     this.bodyUsed = false;
 
     this._initBody = function(body) {
+      /*
+        fetch-mock wraps the Response object in an ES6 Proxy to
+        provide useful test harness features such as flush. However, on
+        ES5 browsers without fetch or Proxy support pollyfills must be used;
+        the proxy-pollyfill is unable to proxy an attribute unless it exists
+        on the object before the Proxy is created. This change ensures
+        Response.bodyUsed exists on the instance, while maintaining the
+        semantic of setting Request.bodyUsed in the constructor before
+        _initBody is called.
+      */
+      this.bodyUsed = this.bodyUsed;
       this._bodyInit = body;
       if (!body) {
         this._bodyText = '';
@@ -267,7 +283,20 @@
 
       this.arrayBuffer = function() {
         if (this._bodyArrayBuffer) {
-          return consumed(this) || Promise.resolve(this._bodyArrayBuffer)
+          var isConsumed = consumed(this);
+          if (isConsumed) {
+            return isConsumed
+          }
+          if (ArrayBuffer.isView(this._bodyArrayBuffer)) {
+            return Promise.resolve(
+              this._bodyArrayBuffer.buffer.slice(
+                this._bodyArrayBuffer.byteOffset,
+                this._bodyArrayBuffer.byteOffset + this._bodyArrayBuffer.byteLength
+              )
+            )
+          } else {
+            return Promise.resolve(this._bodyArrayBuffer)
+          }
         } else {
           return this.blob().then(readBlobAsArrayBuffer)
         }
@@ -313,6 +342,10 @@
   }
 
   function Request(input, options) {
+    if (!(this instanceof Request)) {
+      throw new TypeError('Please use the "new" operator, this DOM object constructor cannot be called as a function.')
+    }
+
     options = options || {};
     var body = options.body;
 
@@ -349,6 +382,21 @@
       throw new TypeError('Body not allowed for GET or HEAD requests')
     }
     this._initBody(body);
+
+    if (this.method === 'GET' || this.method === 'HEAD') {
+      if (options.cache === 'no-store' || options.cache === 'no-cache') {
+        // Search for a '_' parameter in the query string
+        var reParamSearch = /([?&])_=[^&]*/;
+        if (reParamSearch.test(this.url)) {
+          // If it already exists then set the value with the current time
+          this.url = this.url.replace(reParamSearch, '$1_=' + new Date().getTime());
+        } else {
+          // Otherwise add a new '_' parameter to the end with the current time
+          var reQueryString = /\?/;
+          this.url += (reQueryString.test(this.url) ? '&' : '?') + '_=' + new Date().getTime();
+        }
+      }
+    }
   }
 
   Request.prototype.clone = function() {
@@ -376,7 +424,15 @@
     // Replace instances of \r\n and \n followed by at least one space or horizontal tab with a space
     // https://tools.ietf.org/html/rfc7230#section-3.2
     var preProcessedHeaders = rawHeaders.replace(/\r?\n[\t ]+/g, ' ');
-    preProcessedHeaders.split(/\r?\n/).forEach(function(line) {
+    // Avoiding split via regex to work around a common IE11 bug with the core-js 3.6.0 regex polyfill
+    // https://github.com/github/fetch/issues/748
+    // https://github.com/zloirock/core-js/issues/751
+    preProcessedHeaders
+      .split('\r')
+      .map(function(header) {
+        return header.indexOf('\n') === 0 ? header.substr(1, header.length) : header
+      })
+      .forEach(function(line) {
         var parts = line.split(':');
         var key = parts.shift().trim();
         if (key) {
@@ -390,6 +446,9 @@
   Body.call(Request.prototype);
 
   function Response(bodyInit, options) {
+    if (!(this instanceof Response)) {
+      throw new TypeError('Please use the "new" operator, this DOM object constructor cannot be called as a function.')
+    }
     if (!options) {
       options = {};
     }
@@ -397,7 +456,7 @@
     this.type = 'default';
     this.status = options.status === undefined ? 200 : options.status;
     this.ok = this.status >= 200 && this.status < 300;
-    this.statusText = 'statusText' in options ? options.statusText : 'OK';
+    this.statusText = options.statusText === undefined ? '' : '' + options.statusText;
     this.headers = new Headers(options.headers);
     this.url = options.url || '';
     this._initBody(bodyInit);
@@ -430,7 +489,7 @@
     return new Response(null, {status: status, headers: {location: url}})
   };
 
-  exports.DOMException = self.DOMException;
+  exports.DOMException = global.DOMException;
   try {
     new exports.DOMException();
   } catch (err) {
@@ -466,22 +525,38 @@
         };
         options.url = 'responseURL' in xhr ? xhr.responseURL : options.headers.get('X-Request-URL');
         var body = 'response' in xhr ? xhr.response : xhr.responseText;
+        setTimeout(function() {
           resolve(new Response(body, options));
+        }, 0);
       };
 
       xhr.onerror = function() {
+        setTimeout(function() {
           reject(new TypeError('Network request failed'));
+        }, 0);
       };
 
       xhr.ontimeout = function() {
+        setTimeout(function() {
           reject(new TypeError('Network request failed'));
+        }, 0);
       };
 
       xhr.onabort = function() {
+        setTimeout(function() {
           reject(new exports.DOMException('Aborted', 'AbortError'));
+        }, 0);
       };
 
-      xhr.open(request.method, request.url, true);
+      function fixUrl(url) {
+        try {
+          return url === '' && global.location.href ? global.location.href : url
+        } catch (e) {
+          return url
+        }
+      }
+
+      xhr.open(request.method, fixUrl(request.url), true);
 
       if (request.credentials === 'include') {
         xhr.withCredentials = true;
@@ -489,13 +564,27 @@
         xhr.withCredentials = false;
       }
 
-      if ('responseType' in xhr && support.blob) {
+      if ('responseType' in xhr) {
+        if (support.blob) {
           xhr.responseType = 'blob';
+        } else if (
+          support.arrayBuffer &&
+          request.headers.get('Content-Type') &&
+          request.headers.get('Content-Type').indexOf('application/octet-stream') !== -1
+        ) {
+          xhr.responseType = 'arraybuffer';
+        }
       }
 
+      if (init && typeof init.headers === 'object' && !(init.headers instanceof Headers)) {
+        Object.getOwnPropertyNames(init.headers).forEach(function(name) {
+          xhr.setRequestHeader(name, normalizeValue(init.headers[name]));
+        });
+      } else {
         request.headers.forEach(function(value, name) {
           xhr.setRequestHeader(name, value);
         });
+      }
 
       if (request.signal) {
         request.signal.addEventListener('abort', abortXhr);
@@ -514,11 +603,11 @@
 
   fetch.polyfill = true;
 
-  if (!self.fetch) {
+  if (!global.fetch) {
-    self.fetch = fetch;
+    global.fetch = fetch;
-    self.Headers = Headers;
+    global.Headers = Headers;
-    self.Request = Request;
+    global.Request = Request;
-    self.Response = Response;
+    global.Response = Response;
   }
 
   exports.Headers = Headers;

wp-includes/script-loader.php

@@ -101,7 +101,7 @@ function wp_default_packages_vendor( $scripts ) {
 		'regenerator-runtime'         => '0.13.7',
 		'moment'                      => '2.29.1',
 		'lodash'                      => '4.17.19',
-		'wp-polyfill-fetch'           => '3.0.0',
+		'wp-polyfill-fetch'           => '3.6.2',
 		'wp-polyfill-formdata'        => '4.0.0',
 		'wp-polyfill-node-contains'   => '3.105.0',
 		'wp-polyfill-url'             => '3.6.4',

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-51689';
+$wp_version = '5.9-alpha-51692';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.