feat: split openExternal into sync and async (#16176)

* feat: split openExternal into sync and async

* v8::Locker => mate::Locker

* fix: enter js env when resolving promise

docs/api/menu.md

@@ -245,7 +245,7 @@ const template = [
     submenu: [
       {
         label: 'Learn More',
-        click () { require('electron').shell.openExternal('https://electronjs.org') }
+        click () { require('electron').shell.openExternalSync('https://electronjs.org') }
       }
     ]
   }

docs/api/promisification.md

@@ -8,7 +8,6 @@ When a majority of affected functions are migrated, this flag will be enabled by
 
 ### Candidate Functions
 
-- [ ] [app.getFileIcon(path[, options], callback)](https://github.com/electron/electron/blob/master/docs/api/app.md#getFileIcon)
 - [ ] [app.importCertificate(options, callback)](https://github.com/electron/electron/blob/master/docs/api/app.md#importCertificate)
 - [ ] [request.write(chunk[, encoding][, callback])](https://github.com/electron/electron/blob/master/docs/api/client-request.md#write)
 - [ ] [request.end([chunk][, encoding][, callback])](https://github.com/electron/electron/blob/master/docs/api/client-request.md#end)
@@ -41,7 +40,6 @@ When a majority of affected functions are migrated, this flag will be enabled by
 - [ ] [ses.clearHostResolverCache([callback])](https://github.com/electron/electron/blob/master/docs/api/session.md#clearHostResolverCache)
 - [ ] [ses.getBlobData(identifier, callback)](https://github.com/electron/electron/blob/master/docs/api/session.md#getBlobData)
 - [ ] [ses.clearAuthCache(options[, callback])](https://github.com/electron/electron/blob/master/docs/api/session.md#clearAuthCache)
-- [ ] [shell.openExternal(url[, options, callback])](https://github.com/electron/electron/blob/master/docs/api/shell.md#openExternal)
 - [ ] [contents.executeJavaScript(code[, userGesture, callback])](https://github.com/electron/electron/blob/master/docs/api/web-contents.md#executeJavaScript)
 - [ ] [contents.getZoomFactor(callback)](https://github.com/electron/electron/blob/master/docs/api/web-contents.md#getZoomFactor)
 - [ ] [contents.getZoomLevel(callback)](https://github.com/electron/electron/blob/master/docs/api/web-contents.md#getZoomLevel)
@@ -61,4 +59,6 @@ When a majority of affected functions are migrated, this flag will be enabled by
 
 - [ ] [win.capturePage([rect, ]callback)](https://github.com/electron/electron/blob/master/docs/api/browser-window.md#capturePage)
 - [ ] [webviewTag.capturePage([rect, ]callback)](https://github.com/electron/electron/blob/master/docs/api/webview-tag.md#capturePage)
-- [ ] [contents.capturePage([rect, ]callback)](https://github.com/electron/electron/blob/master/docs/api/web-contents.md#capturePage)
+- [ ] [contents.capturePage([rect, ]callback)](https://github.com/electron/electron/blob/master/docs/api/web-contents.md#capturePage)
+- [ ] [app.getFileIcon(path[, options], callback)](https://github.com/electron/electron/blob/master/docs/api/app.md#getFileIcon)
+- [ ] [shell.openExternal(url[, options, callback])](https://github.com/electron/electron/blob/master/docs/api/shell.md#openExternal)

docs/api/shell.md

@@ -34,21 +34,29 @@ Returns `Boolean` - Whether the item was successfully opened.
 
 Open the given file in the desktop's default manner.
 
-### `shell.openExternal(url[, options, callback])`
+### `shell.openExternalSync(url[, options])`
 
-* `url` String - Max 2081 characters on windows, or the function returns false.
+* `url` String - Max 2081 characters on Windows, or the function returns false.
 * `options` Object (optional)
   * `activate` Boolean (optional) - `true` to bring the opened application to the
     foreground. The default is `true`. _macOS_
   * `workingDirectory` String (optional) - The working directory. _Windows_
-* `callback` Function (optional) _macOS_ - If specified will perform the open asynchronously.
-  * `error` Error
 
 Returns `Boolean` - Whether an application was available to open the URL.
-If callback is specified, always returns true.
 
-Open the given external protocol URL in the desktop's default manner. (For
-example, mailto: URLs in the user's default mail agent).
+Open the given external protocol URL in the desktop's default manner. (For example, mailto: URLs in the user's default mail agent).
+
+### `shell.openExternal(url[, options])`
+
+* `url` String - Max 2081 characters on windows.
+* `options` Object (optional)
+  * `activate` Boolean (optional) - `true` to bring the opened application to the
+    foreground. The default is `true`. _macOS_
+  * `workingDirectory` String (optional) - The working directory. _Windows_
+
+Returns `Promise<void>`
+
+Open the given external protocol URL in the desktop's default manner. (For example, mailto: URLs in the user's default mail agent).
 
 ### `shell.moveItemToTrash(fullPath)`
 

docs/api/webview-tag.md

@@ -782,7 +782,7 @@ const webview = document.querySelector('webview')
 webview.addEventListener('new-window', (e) => {
   const protocol = require('url').parse(e.url).protocol
   if (protocol === 'http:' || protocol === 'https:') {
-    shell.openExternal(e.url)
+    shell.openExternalSync(e.url)
   }
 })
 ```