feat: remove deprecated additionalFeatures (#28548)

docs/api/web-contents.md

@@ -147,7 +147,8 @@ Returns:
 * `options` BrowserWindowConstructorOptions - The options which will be used for creating the new
   [`BrowserWindow`](browser-window.md).
 * `additionalFeatures` String[] - The non-standard features (features not handled
-  by Chromium or Electron) given to `window.open()`.
+  by Chromium or Electron) given to `window.open()`. Deprecated, and will now
+  always be the empty array `[]`.
 * `referrer` [Referrer](structures/referrer.md) - The referrer that will be
   passed to the new window. May or may not result in the `Referer` header being
   sent, depending on the referrer policy.
@@ -207,8 +208,6 @@ Returns:
     `window.open()`, and options given by
     [`webContents.setWindowOpenHandler`](web-contents.md#contentssetwindowopenhandlerhandler).
     Unrecognized options are not filtered out.
-  * `additionalFeatures` String[] - The non-standard features (features not
-    handled Chromium or Electron) _Deprecated_
   * `referrer` [Referrer](structures/referrer.md) - The referrer that will be
     passed to the new window. May or may not result in the `Referer` header
     being sent, depending on the referrer policy.

docs/api/window-open.md

@@ -63,7 +63,7 @@ window.open('https://github.com', '_blank', 'top=500,left=200,frame=false,nodeIn
   the parent window.
 * Non-standard features (that are not handled by Chromium or Electron) given in
   `features` will be passed to any registered `webContents`'s
-  `did-create-window` event handler in the `additionalFeatures` argument.
+  `did-create-window` event handler in the `options` argument.
 * `frameName` follows the specification of `windowName` located in the [native documentation](https://developer.mozilla.org/en-US/docs/Web/API/Window/open#parameters).
 
 To customize or cancel the creation of the window, you can optionally set an

docs/breaking-changes.md

@@ -38,6 +38,32 @@ to open synchronously scriptable child windows, among other incompatibilities.
 See the documentation for [window.open in Electron](api/window-open.md)
 for more details.
 
+### Removed: `additionalFeatures`
+
+The deprecated `additionalFeatures` property in the `new-window` and
+`did-create-window` events of WebContents has been removed. Since `new-window`
+uses positional arguments, the argument is still present, but will always be
+the empty array `[]`. (Though note, the `new-window` event itself is
+deprecated, and is replaced by `setWindowOpenHandler`.) Bare keys in window
+features will now present as keys with the value `true` in the options object.
+
+```js
+// Removed in Electron 14
+// Triggered by window.open('...', '', 'my-key')
+webContents.on('did-create-window', (window, details) => {
+  if (details.additionalFeatures.includes('my-key')) {
+    // ...
+  }
+})
+
+// Replace with
+webContents.on('did-create-window', (window, details) => {
+  if (details.options['my-key']) {
+    // ...
+  }
+})
+```
+
 ## Planned Breaking API Changes (13.0)
 
 ### API Changed: `session.setPermissionCheckHandler(handler)`

lib/browser/guest-window-manager.ts

@@ -42,7 +42,7 @@ export function openGuestWindow ({ event, embedder, guest, referrer, disposition
   windowOpenArgs: WindowOpenArgs,
 }): BrowserWindow | undefined {
   const { url, frameName, features } = windowOpenArgs;
-  const { options: browserWindowOptions, additionalFeatures } = makeBrowserWindowOptions({
+  const { options: browserWindowOptions } = makeBrowserWindowOptions({
     embedder,
     features,
     overrideOptions: overrideBrowserWindowOptions
@@ -54,7 +54,6 @@ export function openGuestWindow ({ event, embedder, guest, referrer, disposition
     guest,
     browserWindowOptions,
     windowOpenArgs,
-    additionalFeatures,
     disposition,
     postData,
     referrer
@@ -93,7 +92,7 @@ export function openGuestWindow ({ event, embedder, guest, referrer, disposition
 
   handleWindowLifecycleEvents({ embedder, frameName, guest: window });
 
-  embedder.emit('did-create-window', window, { url, frameName, options: browserWindowOptions, disposition, additionalFeatures, referrer, postData });
+  embedder.emit('did-create-window', window, { url, frameName, options: browserWindowOptions, disposition, referrer, postData });
 
   return window;
 }
@@ -134,13 +133,12 @@ const handleWindowLifecycleEvents = function ({ embedder, guest, frameName }: {
  * Deprecated in favor of `webContents.setWindowOpenHandler` and
  * `did-create-window` in 11.0.0. Will be removed in 12.0.0.
  */
-function emitDeprecatedNewWindowEvent ({ event, embedder, guest, windowOpenArgs, browserWindowOptions, additionalFeatures, disposition, referrer, postData }: {
+function emitDeprecatedNewWindowEvent ({ event, embedder, guest, windowOpenArgs, browserWindowOptions, disposition, referrer, postData }: {
   event: { sender: WebContents, defaultPrevented: boolean, newGuest?: BrowserWindow },
   embedder: WebContents,
   guest?: WebContents,
   windowOpenArgs: WindowOpenArgs,
   browserWindowOptions: BrowserWindowConstructorOptions,
-  additionalFeatures: string[]
   disposition: string,
   referrer: Referrer,
   postData?: PostData,
@@ -162,7 +160,7 @@ function emitDeprecatedNewWindowEvent ({ event, embedder, guest, windowOpenArgs,
       ...browserWindowOptions,
       webContents: guest
     },
-    additionalFeatures,
+    [], // additionalFeatures
     referrer,
     postBody
   );
@@ -200,19 +198,17 @@ const securityWebPreferences: { [key: string]: boolean } = {
   enableWebSQL: false
 };
 
-function makeBrowserWindowOptions ({ embedder, features, overrideOptions, useDeprecatedBehaviorForBareValues = true, useDeprecatedBehaviorForOptionInheritance = true }: {
+function makeBrowserWindowOptions ({ embedder, features, overrideOptions, useDeprecatedBehaviorForOptionInheritance = true }: {
   embedder: WebContents,
   features: string,
   overrideOptions?: BrowserWindowConstructorOptions,
-  useDeprecatedBehaviorForBareValues?: boolean
   useDeprecatedBehaviorForOptionInheritance?: boolean
 }) {
-  const { options: parsedOptions, webPreferences: parsedWebPreferences, additionalFeatures } = parseFeatures(features, useDeprecatedBehaviorForBareValues);
+  const { options: parsedOptions, webPreferences: parsedWebPreferences } = parseFeatures(features);
 
   const deprecatedInheritedOptions = getDeprecatedInheritedOptions(embedder);
 
   return {
-    additionalFeatures,
     options: {
       ...(useDeprecatedBehaviorForOptionInheritance && deprecatedInheritedOptions),
       show: true,
@@ -232,7 +228,6 @@ export function makeWebPreferences ({ embedder, secureOverrideWebPreferences = {
   // sourced from the main process, as they override security defaults. If you
   // have unvetted prefs, use parsedWebPreferences.
   secureOverrideWebPreferences?: BrowserWindowConstructorOptions['webPreferences'],
-  useDeprecatedBehaviorForBareValues?: boolean
   useDeprecatedBehaviorForOptionInheritance?: boolean
 }) {
   const deprecatedInheritedOptions = getDeprecatedInheritedOptions(embedder);

lib/common/parse-features-string.ts

@@ -56,41 +56,28 @@ function coerce (key: string, value: string): CoercedValue {
   }
 }
 
-export function parseCommaSeparatedKeyValue (source: string, useSoonToBeDeprecatedBehaviorForBareKeys: boolean) {
-  const bareKeys = [] as string[];
+export function parseCommaSeparatedKeyValue (source: string) {
   const parsed = {} as { [key: string]: any };
   for (const keyValuePair of source.split(',')) {
     const [key, value] = keyValuePair.split('=').map(str => str.trim());
-    if (useSoonToBeDeprecatedBehaviorForBareKeys && value === undefined) {
-      if (key) { bareKeys.push(key); }
-      continue;
-    }
-    parsed[key] = coerce(key, value);
+    if (key) { parsed[key] = coerce(key, value); }
   }
 
-  return { parsed, bareKeys };
+  return parsed;
 }
 
 export function parseWebViewWebPreferences (preferences: string) {
-  return parseCommaSeparatedKeyValue(preferences, false).parsed;
+  return parseCommaSeparatedKeyValue(preferences);
 }
 
 const allowedWebPreferences = ['zoomFactor', 'nodeIntegration', 'javascript', 'contextIsolation', 'webviewTag'] as const;
 type AllowedWebPreference = (typeof allowedWebPreferences)[number];
 
 /**
  * Parses a feature string that has the format used in window.open().
- *
- * `useSoonToBeDeprecatedBehaviorForBareKeys` - In the html spec, windowFeatures keys
- * without values are interpreted as `true`. Previous versions of Electron did
- * not respect this. In order to not break any applications, this will be
- * flipped in the next major version.
  */
-export function parseFeatures (
-  features: string,
-  useSoonToBeDeprecatedBehaviorForBareKeys: boolean = true
-) {
-  const { parsed, bareKeys } = parseCommaSeparatedKeyValue(features, useSoonToBeDeprecatedBehaviorForBareKeys);
+export function parseFeatures (features: string) {
+  const parsed = parseCommaSeparatedKeyValue(features);
 
   const webPreferences: { [K in AllowedWebPreference]?: any } = {};
   allowedWebPreferences.forEach((key) => {
@@ -104,7 +91,6 @@ export function parseFeatures (
 
   return {
     options: parsed as Omit<BrowserWindowConstructorOptions, 'webPreferences'>,
-    webPreferences,
-    additionalFeatures: bareKeys
+    webPreferences
   };
 }

spec-main/api-browser-window-spec.ts

@@ -3003,12 +3003,12 @@ describe('BrowserWindow module', () => {
 
     it('emits when window.open is called', (done) => {
       const w = new BrowserWindow({ show: false, webPreferences: { nodeIntegration: true } });
-      w.webContents.once('new-window', (e, url, frameName, disposition, options, additionalFeatures) => {
+      w.webContents.once('new-window', (e, url, frameName, disposition, options) => {
         e.preventDefault();
         try {
           expect(url).to.equal('http://host/');
           expect(frameName).to.equal('host');
-          expect(additionalFeatures[0]).to.equal('this-is-not-a-standard-feature');
+          expect((options as any)['this-is-not-a-standard-feature']).to.equal(true);
           done();
         } catch (e) {
           done(e);
@@ -3019,12 +3019,12 @@ describe('BrowserWindow module', () => {
 
     it('emits when window.open is called with no webPreferences', (done) => {
       const w = new BrowserWindow({ show: false });
-      w.webContents.once('new-window', function (e, url, frameName, disposition, options, additionalFeatures) {
+      w.webContents.once('new-window', function (e, url, frameName, disposition, options) {
         e.preventDefault();
         try {
           expect(url).to.equal('http://host/');
           expect(frameName).to.equal('host');
-          expect(additionalFeatures[0]).to.equal('this-is-not-a-standard-feature');
+          expect((options as any)['this-is-not-a-standard-feature']).to.equal(true);
           done();
         } catch (e) {
           done(e);

spec-main/internal-spec.ts

@@ -4,7 +4,7 @@ describe('feature-string parsing', () => {
   it('is indifferent to whitespace around keys and values', () => {
     const { parseCommaSeparatedKeyValue } = require('../lib/common/parse-features-string');
     const checkParse = (string: string, parsed: Record<string, string | boolean>) => {
-      const features = parseCommaSeparatedKeyValue(string, true).parsed;
+      const features = parseCommaSeparatedKeyValue(string);
       expect(features).to.deep.equal(parsed);
     };
     checkParse('a=yes,c=d', { a: true, c: 'd' });