Fix: IPC-related issue on non-Windows platforms (#119)

* Use SIGTERM instead of IPC on non-Windows platforms

* Refactor serve tests for child exit

* [skip ci] formatting(tests)

This makes it so the IPC graceful exit is only used on non-windows platforms because of electron/electron/issues/14821

Author: Desuuuu

__tests__/commands.spec.js

@@ -317,6 +317,7 @@ describe('electron:build', () => {
 
 describe('electron:serve', () => {
   process.env.NODE_ENV = 'development'
+  const isWin = process.platform === 'win32'
 
   test('typescript is disabled when set in options', async () => {
     await runCommand('electron:serve', {
@@ -466,6 +467,7 @@ describe('electron:serve', () => {
     expect(fs.watchFile.mock.calls[0][0]).toBe('projectPath/customBackground')
     // Child has not yet been killed or unwatched
     expect(mockExeca.send).not.toBeCalled()
+    expect(mockExeca.kill).not.toBeCalled()
     expect(mockExeca.removeAllListeners).not.toBeCalled()
     // Main process was bundled and Electron was launched initially
     expect(webpack).toHaveBeenCalledTimes(1)
@@ -475,8 +477,13 @@ describe('electron:serve', () => {
     watchCb()
     childEvents.exit()
     // Electron was killed and listeners removed
-    expect(mockExeca.send).toHaveBeenCalledTimes(1)
-    expect(mockExeca.send).toHaveBeenCalledWith('graceful-exit')
+    if (isWin) {
+      expect(mockExeca.send).toHaveBeenCalledTimes(1)
+      expect(mockExeca.send).toHaveBeenCalledWith('graceful-exit')
+    } else {
+      expect(mockExeca.kill).toHaveBeenCalledTimes(1)
+      expect(mockExeca.kill).toHaveBeenCalledWith('SIGTERM')
+    }
     // Process did not exit on Electron close
     expect(process.exit).not.toBeCalled()
     // Main process file was recompiled
@@ -509,6 +516,7 @@ describe('electron:serve', () => {
     expect(fs.watchFile.mock.calls[1][0]).toBe('projectPath/listFile')
     // Child has not yet been killed or unwatched
     expect(mockExeca.send).not.toBeCalled()
+    expect(mockExeca.kill).not.toBeCalled()
     expect(mockExeca.removeAllListeners).not.toBeCalled()
     // Main process was bundled and Electron was launched initially
     expect(webpack).toHaveBeenCalledTimes(1)
@@ -518,8 +526,13 @@ describe('electron:serve', () => {
     watchCb['projectPath/listFile']()
     childEvents.exit()
     // Electron was killed and listeners removed
-    expect(mockExeca.send).toHaveBeenCalledTimes(1)
-    expect(mockExeca.send).toHaveBeenCalledWith('graceful-exit')
+    if (isWin) {
+      expect(mockExeca.send).toHaveBeenCalledTimes(1)
+      expect(mockExeca.send).toHaveBeenCalledWith('graceful-exit')
+    } else {
+      expect(mockExeca.kill).toHaveBeenCalledTimes(1)
+      expect(mockExeca.kill).toHaveBeenCalledWith('SIGTERM')
+    }
     // Process did not exit on Electron close
     expect(process.exit).not.toBeCalled()
     // Main process file was recompiled
@@ -531,8 +544,13 @@ describe('electron:serve', () => {
     watchCb['projectPath/customBackground']()
     childEvents.exit()
     // Electron was killed and listeners removed
-    expect(mockExeca.send).toHaveBeenCalledTimes(2)
-    expect(mockExeca.send).toHaveBeenCalledWith('graceful-exit')
+    if (isWin) {
+      expect(mockExeca.send).toHaveBeenCalledTimes(2)
+      expect(mockExeca.send).toHaveBeenCalledWith('graceful-exit')
+    } else {
+      expect(mockExeca.kill).toHaveBeenCalledTimes(2)
+      expect(mockExeca.kill).toHaveBeenCalledWith('SIGTERM')
+    }
     // Process did not exit on Electron close
     expect(process.exit).not.toBeCalled()
     // Main process file was recompiled

generator/template/src/background.js

@@ -62,9 +62,15 @@ app.on('ready', async () => {
 
 // Exit cleanly on request from parent process in development mode.
 if (isDevelopment) {
-  process.on('message', data => {
-    if (data === 'graceful-exit') {
+  if (process.platform === 'win32') {
+    process.on('message', data => {
+      if (data === 'graceful-exit') {
+        app.quit()
+      }
+    })
+  } else {
+    process.on('SIGTERM', () => {
       app.quit()
-    }
-  })
+    })
+  }
 }

index.js

@@ -273,12 +273,16 @@ module.exports = (api, options) => {
         }
 
         // Attempt to kill gracefully
-        child.send('graceful-exit')
+        if (process.platform === 'win32') {
+          child.send('graceful-exit')
+        } else {
+          child.kill('SIGTERM')
+        }
 
-        // Kill after 2 seconds if unsuccessful
+        // Kill unconditionally after 2 seconds if unsuccessful
         childExitTimeout = setTimeout(() => {
           if (child) {
-            child.kill()
+            child.kill('SIGKILL')
           }
         }, 2000)
       }
@@ -360,6 +364,11 @@ module.exports = (api, options) => {
           // Disable Electron process auto restart
           childRestartOnExit = 0
 
+          let stdioConfig = [null, null, null]
+
+          // Use an IPC on Windows for graceful exit
+          if (process.platform === 'win32') stdioConfig.push('ipc')
+
           child = execa(
             require('electron'),
             [
@@ -375,7 +384,7 @@ module.exports = (api, options) => {
                 // Disable electron security warnings
                 ELECTRON_DISABLE_SECURITY_WARNINGS: true
               },
-              stdio: [null, null, null, 'ipc']
+              stdio: stdioConfig
             }
           )