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https://github.com/spaceagetv/electron-playwright-helpers

Helper functions for running Electron end-to-end tests using Playwright.
https://github.com/spaceagetv/electron-playwright-helpers

electron end-to-end end-to-end-testing playwright typescript

Last synced: 6 months ago
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Helper functions for running Electron end-to-end tests using Playwright.

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README 

          
# Electron Playwright Helpers



[![npm version](https://img.shields.io/npm/v/electron-playwright-helpers.svg)](https://www.npmjs.com/package/electron-playwright-helpers)

[![npm downloads](https://img.shields.io/npm/dm/electron-playwright-helpers.svg)](https://www.npmjs.com/package/electron-playwright-helpers)



Helper functions to make it easier to use [Playwright](https://playwright.dev/) for end-to-end testing with

[Electron](https://www.electronjs.org/). Parse packaged Electron projects so you can run tests on them. Click Electron menu items, send IPC messages, get menu structures, stub `dialog.showOpenDialog()` results, etc.



## Installation



```shell

npm i -D electron-playwright-helpers

```



## Usage



For a full example of how to use this library, see the 

[electron-playwright-example](https://github.com/spaceagetv/electron-playwright-example) project.

But here's a quick example:



Javascript:



```JS

const eph = require('electron-playwright-helpers')

// - or cherry pick -

const { findLatestBuild, parseElectronApp, clickMenuItemById } = require('electron-playwright-helpers')



let electronApp: ElectronApplication



test.beforeAll(async () => {

  // find the latest build in the out directory

  const latestBuild = findLatestBuild()

  // parse the packaged Electron app and find paths and other info

  const appInfo = parseElectronApp(latestBuild)

  electronApp = await electron.launch({

    args: [appInfo.main], // main file from package.json

    executablePath: appInfo.executable // path to the Electron executable

  })

})



test.afterAll(async () => {

  await electronApp.close()

})



test('open a file', async () => {

  // stub electron dialog so dialog.showOpenDialog() 

  // will return a file path without opening a dialog

  await eph.stubDialog(electronApp, 'showOpenDialog', { filePaths: ['/path/to/file'] })



  // call the click method of menu item in the Electron app's application menu

  await eph.clickMenuItemById(electronApp, 'open-file')



  // get the result of an ipcMain.handle() function

  const result = await eph.ipcMainInvokeHandler(electronApp, 'get-open-file-path')

  

  // result should be the file path

  expect(result).toBe('/path/to/file')

})

```



Typescript:



```TS

import * as eph from 'electron-playwright-helpers'

// - or cherry pick -

import { electronWaitForFunction, ipcMainCallFirstListener, clickMenuItemById } from 'electron-playwright-helpers'



// then same as Javascript above

```



## Contributing



Yes, please! Pull requests are always welcome. Feel free to add or suggest new features, fix bugs, etc.



Please use [Conventional Commit](https://www.conventionalcommits.org/) messages for your commits. This project uses [semantic-release](https://github.com/semantic-release/semantic-release) to automatically publish new versions to NPM. The commit messages are used to determine the version number and changelog. We're also using Prettier as our code format and ESlint to enforce formatting, so please make sure your code is formatted before submitting a PR.



## Migrating from v1.x to v2.0



Version 2.0 introduces significant improvements to handle flakiness issues that appeared with Electron 27+ and Playwright. Starting with Electron 27, Playwright's `evaluate()` calls became unreliable, often throwing errors like "context or browser has been closed", "Promise was collected", or "Execution context was destroyed" seemingly at random.



### What's New in v2.0



#### Built-in Retry Logic



All helper functions now automatically retry operations that fail due to Playwright context issues. This happens transparently - your existing code will work without changes, but will be more reliable.



#### New Utility Functions



- **`retry(fn, options)`** - Wrap any Playwright call to automatically retry on context errors

- **`retryUntilTruthy(fn, options)`** - Like Playwright's `page.waitForFunction()` but with automatic retry on errors

- **`setRetryOptions(options)`** - Configure default retry behavior globally

- **`getRetryOptions()`** - Get current retry configuration

- **`resetRetryOptions()`** - Reset retry options to defaults



#### Conditional Dialog Stubbing (New!)



- **`stubDialogMatchers(app, stubs, options)`** - Stub dialogs with conditional matching based on dialog options

- **`clearDialogMatchers(app)`** - Clear dialog matcher stubs



### Breaking Changes



#### 1. Node.js 18+ Required



Version 2.0 requires Node.js 18 or later due to modern JavaScript features like `structuredClone()`.



#### 2. IPC Helper Function Signatures



IPC helpers now accept an optional `RetryOptions` object as the last argument:



```typescript

// v1.x

await ipcRendererSend(page, 'my-channel', arg1, arg2)



// v2.0 - still works exactly the same

await ipcRendererSend(page, 'my-channel', arg1, arg2)



// v2.0 - with retry options

await ipcRendererSend(page, 'my-channel', arg1, arg2, { timeout: 10000 })

```



This applies to: `ipcRendererSend`, `ipcRendererInvoke`, `ipcRendererEmit`, `ipcRendererCallFirstListener`, `ipcMainEmit`, `ipcMainCallFirstListener`, `ipcMainInvokeHandler`



#### 3. Menu Helper Function Signatures



Menu helpers now accept an optional `RetryOptions` object:



```typescript

// v1.x

await clickMenuItemById(electronApp, 'my-menu-item')



// v2.0 - still works exactly the same

await clickMenuItemById(electronApp, 'my-menu-item')



// v2.0 - with retry options

await clickMenuItemById(electronApp, 'my-menu-item', { timeout: 10000 })

```



### Migration Steps



For most projects, upgrading is straightforward:



1. **Update Node.js** to version 18 or later

2. **Update the package**: `npm install electron-playwright-helpers@latest`

3. **Test your suite** - existing code should work without changes



### Customizing Retry Behavior



If you need to adjust retry behavior globally:



```typescript

import { setRetryOptions, resetRetryOptions } from 'electron-playwright-helpers'



// Increase timeout for slow CI environments

setRetryOptions({

  timeout: 10000,  // 10 seconds (default: 5000)

  poll: 500,       // poll every 500ms (default: 200)

})



// Reset to defaults

resetRetryOptions()

```



Or disable retries for specific calls:



```typescript

await ipcRendererSend(page, 'channel', arg, { disable: true })

```



### Using the New Retry Functions



If you have custom Playwright `evaluate()` calls that aren't using our helpers, wrap them with `retry()`:



```typescript

import { retry, retryUntilTruthy } from 'electron-playwright-helpers'



// Wrap evaluate calls to handle context errors

const result = await retry(() =>

  electronApp.evaluate(({ app }) => app.getName())

)



// Wait for a condition with automatic error recovery

await retryUntilTruthy(() =>

  page.evaluate(() => document.body.classList.contains('ready'))

)

```



## Additional Resources



* [Electron Playwright Example](https://github.com/spaceagetv/electron-playwright-example) - an example of how to use this library

* [Playwright Electron Class](https://playwright.dev/docs/api/class-electron) - Playwright API docs for Electron

* [Electron API](https://electronjs.org/docs/api/app) - Electron API documentation



## API



## Constants





dialogMatcherDefaults


Union type of all dialog matcher stubs.





## Functions





toSerializableMatcher()


Convert a string or RegExp to a serializable StringMatcher.

RegExp objects cannot be transferred via Playwright's evaluate(),

so we serialize them as {source, flags}.


matchesPattern()


Check if a value matches a StringMatcher.

Used inside app.evaluate() where the matcher is already serialized.




findLatestBuild(buildDirectory) ⇒ string





Parses the out directory to find the latest build of your Electron project.

Use npm run package (or similar) to build your app prior to testing.


Assumptions: We assume that your build will be in the out directory, and that

the build directory will be named with a hyphen-delimited platform name, e.g.

out/my-app-win-x64. If your build directory is not out, you can

pass the name of the directory as the buildDirectory parameter. If your

build directory is not named with a hyphen-delimited platform name, this

function will not work. However, you can pass the build path into

parseElectronApp() directly.






parseElectronApp(buildDir) ⇒ ElectronAppInfo





Given a directory containing an Electron app build,

or the path to the app itself (directory on Mac, executable on Windows),

return a bunch of metadata, including the path to the app's executable

and the path to the app's main file.


Format of the data returned is an object with the following properties:


    

  • executable: path to the app's executable file
    • 

  • main: path to the app's main (JS) file
    • 

  • name: name of the app
    • 

  • resourcesDir: path to the app's resources directory
    • 

  • asar: true if the app is using asar
    • 

  • platform: OS platform
    • 

  • arch: architecture
    • 

  • packageJson: the JSON.parse()'d contents of the package.json file.
    • 







electronWaitForFunction(electronApp, fn, arg) ⇒ Promise.<void>





Wait for a function to evaluate to true in the main Electron process. This really

should be part of the Playwright API, but it's not.


This function is to electronApp.evaluate()

as page.waitForFunction() is page.evaluate().






evaluateWithRetry(electronApp, fn, arg, retries, retryIntervalMs) ⇒ Promise.<R>



Electron's evaluate function can be flakey,

throwing an error saying the execution context has been destroyed.

This function retries the evaluation several times to see if it can

run the evaluation without an error. If it fails after the retries,

it throws the error.


isSerializedNativeImageSuccess()


Type guard to check if a SerializedNativeImage is a success case


isSerializedNativeImageError()


Type guard to check if a SerializedNativeImage is an error case




retryUntilTruthy(fn, [timeoutMs], [intervalMs]) ⇒ Promise.<T>





Retries a given function until it returns a truthy value or the timeout is reached.


This offers similar functionality to Playwright's page.waitForFunction()

method – but with more flexibility and control over the retry attempts. It also defaults to ignoring common errors due to

the way that Playwright handles browser contexts.




matchesPattern()


Helper to match a string against a pattern (string or RegExp).

For strings, performs a substring match (includes).

For RegExp, tests the pattern against the value.




stubDialog(app, method, value) ⇒ Promise.<void>





Stub a single dialog method. This is a convenience function that calls stubMultipleDialogs

for a single method.


Playwright does not have a way to interact with Electron dialog windows,

so this function allows you to substitute the dialog module's methods during your tests.

By stubbing the dialog module, your Electron application will not display any dialog windows,

and you can control the return value of the dialog methods. You're basically saying

"when my application calls dialog.showOpenDialog, return this value instead". This allows you

to test your application's behavior when the user selects a file, or cancels the dialog, etc.


Note: Each dialog method can only be stubbed with one value at a time, so you will want to call

stubDialog before each time that you expect your application to call the dialog method.






stubMultipleDialogs(app, mocks) ⇒ Promise.<void>





Stub methods of the Electron dialog module.


Playwright does not have a way to interact with Electron dialog windows,

so this function allows you to mock the dialog module's methods during your tests.

By mocking the dialog module, your Electron application will not display any dialog windows,

and you can control the return value of the dialog methods. You're basically saying

"when my application calls dialog.showOpenDialog, return this value instead". This allows you

to test your application's behavior when the user selects a file, or cancels the dialog, etc.






stubAllDialogs(app) ⇒ Promise.<void>



Stub all dialog methods. This is a convenience function that calls stubMultipleDialogs

for all dialog methods. This is useful if you want to ensure that dialogs are not displayed

during your tests. However, you may want to use stubDialog or stubMultipleDialogs to

control the return value of specific dialog methods (e.g. showOpenDialog) during your tests.




stubDialogMatchers(app, stubs, options) ⇒




Stub dialog methods with matchers that check dialog options before returning values.

This allows you to set up multiple different return values based on the dialog's

title, message, buttons, or other options.


Matchers are checked in order - the first matching stub wins.

If no stub matches, either an error is thrown (if throwOnUnmatched is true)

or the default value is returned.






clearDialogMatchers(app) ⇒


Clear all dialog matcher stubs and restore original dialog methods.

Note: This requires the app to have stored the original methods,

which is not done by default. You may need to restart the app

to fully restore dialog functionality.




ipcMainEmit(electronApp, message, ...args, retryOptions) ⇒ Promise.<boolean>





Emit an ipcMain message from the main process.

This will trigger all ipcMain listeners for the message.


This does not transfer data between main and renderer processes.

It simply emits an event in the main process.






ipcMainCallFirstListener(electronApp, message, ...args, retryOptions) ⇒ Promise.<unknown>





Call the first listener for a given ipcMain message in the main process

and return its result.


NOTE: ipcMain listeners usually don't return a value, but we're using

this to retrieve test data from the main process.


Generally, it's probably better to use ipcMainInvokeHandler() instead.






ipcMainInvokeHandler(electronApp, message, ...args, retryOptions) ⇒ Promise.<unknown>



Get the return value of an ipcMain.handle() function




ipcRendererSend(page, channel, ...args, retryOptions) ⇒ Promise.<unknown>





Send an ipcRenderer.send() (to main process) from a given window.


Note: nodeIntegration must be true and contextIsolation must be false

in the webPreferences for this BrowserWindow.






ipcRendererInvoke(page, message, ...args, retryOptions) ⇒ Promise.<unknown>





Send an ipcRenderer.invoke() from a given window.


Note: nodeIntegration must be true and contextIsolation must be false

in the webPreferences for this window






ipcRendererCallFirstListener(page, message, ...args, retryOptions) ⇒ Promise.<unknown>





Call just the first listener for a given ipcRenderer channel in a given window.

UNLIKE MOST Electron ipcRenderer listeners, this function SHOULD return a value.


This function does not send data between main and renderer processes.

It simply retrieves data from the renderer process.


Note: nodeIntegration must be true for this BrowserWindow.






ipcRendererEmit(page, message, ...args, retryOptions) ⇒ Promise.<boolean>





Emit an IPC message to a given window.

This will trigger all ipcRenderer listeners for the message.


This does not transfer data between main and renderer processes.

It simply emits an event in the renderer process.


Note: nodeIntegration must be true for this window






clickMenuItemById(electronApp, id) ⇒ Promise.<void>



Execute the .click() method on the element with the given id.

NOTE: All menu testing functions will only work with items in the

application menu.




clickMenuItem(electronApp, property, value) ⇒ Promise.<void>





Click the first matching menu item by any of its properties. This is

useful for menu items that don't have an id. HOWEVER, this is not as fast

or reliable as using clickMenuItemById() if the menu item has an id.


NOTE: All menu testing functions will only work with items in the

application menu.






getMenuItemAttribute(electronApp, menuId, attribute) ⇒ Promise.<string>



Get a given attribute the MenuItem with the given id.




getMenuItemById(electronApp, menuId) ⇒ Promise.<MenuItemPartial>



Get information about the MenuItem with the given id. Returns serializable values including

primitives, objects, arrays, and other non-recursive data structures.




getApplicationMenu(electronApp) ⇒ Promise.<Array.<MenuItemPartial>>



Get the current state of the application menu. Contains serializable values including

primitives, objects, arrays, and other non-recursive data structures.

Very similar to menu

construction template structure

in Electron.




findMenuItem(electronApp, property, value, menuItems) ⇒ Promise.<MenuItemPartial>



Find a MenuItem by any of its properties




waitForMenuItem(electronApp, id) ⇒ Promise.<void>



Wait for a MenuItem to exist




waitForMenuItemStatus(electronApp, id, property, value) ⇒ Promise.<void>



Wait for a MenuItem to have a specific attribute value.

For example, wait for a MenuItem to be enabled... or be visible.. etc




addTimeoutToPromise(promise, timeoutMs, timeoutMessage) ⇒ Promise.<T>



Add a timeout to any Promise




addTimeout(functionName, timeoutMs, timeoutMessage, ...args) ⇒ Promise.<T>



Add a timeout to any helper function from this library which returns a Promise.




retry(fn, [options]) ⇒ Promise.<T>





Retries a function until it returns without throwing an error.


Starting with Electron 27, Playwright can get very flakey when running code in Electron's main or renderer processes.

It will often throw errors like "context or browser has been closed" or "Promise was collected" for no apparent reason.

This function retries a given function until it returns without throwing one of these errors, or until the timeout is reached.






setRetryOptions(options) ⇒


Sets the default retry() options. These options will be used for all subsequent calls to retry() unless overridden.

You can reset the defaults at any time by calling resetRetryOptions().




getRetryOptions() ⇒


Gets the current default retry options.


resetRetryOptions()




Resets the retry options to their default values.


The default values are:


    

  • retries: 20
    • 

  • intervalMs: 200
    • 

  • timeoutMs: 5000
    • 

  • errorMatch: 'context or browser has been closed'
    • 







errToString(err) ⇒




Converts an unknown error to a string representation.


This function handles different types of errors and attempts to convert them

to a string in a meaningful way. It checks if the error is an object with a

toString method and uses that method if available. If the error is a string,

it returns the string directly. For other types, it converts the error to a

JSON string.






getWindowByUrl(electronApp, pattern, options) ⇒


Get all windows whose URL matches the given pattern.




getWindowByTitle(electronApp, pattern, options) ⇒


Get all windows whose title matches the given pattern.




getWindowByMatcher(electronApp, matcher, options) ⇒


Get all windows that match the provided matcher function.




waitForWindowByUrl(electronApp, pattern, options) ⇒




Wait for a window whose URL matches the given pattern.


This function checks existing windows first, then listens for new windows.

It uses polling to handle windows that may have their URL change after opening.






waitForWindowByTitle(electronApp, pattern, options) ⇒




Wait for a window whose title matches the given pattern.


This function checks existing windows first, then listens for new windows.

It uses polling to handle windows that may have their title change after opening.






waitForWindowByMatcher(electronApp, matcher, options) ⇒




Wait for a window that matches the provided matcher function.


This function:


    

  1. Checks existing windows first
    2. 

  2. Listens for new window events
    3. 

  3. Polls existing windows periodically (to catch URL/title changes)
    4. 








## Typedefs





ElectronAppInfo


Format of the data returned from parseElectronApp()








## dialogMatcherDefaults

Union type of all dialog matcher stubs.



**Kind**: global constant  




## toSerializableMatcher()

Convert a string or RegExp to a serializable StringMatcher.

RegExp objects cannot be transferred via Playwright's evaluate(),

so we serialize them as {source, flags}.



**Kind**: global function  




## matchesPattern()

Check if a value matches a StringMatcher.

Used inside app.evaluate() where the matcher is already serialized.



**Kind**: global function  




## findLatestBuild(buildDirectory) ⇒ string

Parses the out directory to find the latest build of your Electron project.

Use npm run package (or similar) to build your app prior to testing.


Assumptions: We assume that your build will be in the out directory, and that

the build directory will be named with a hyphen-delimited platform name, e.g.

out/my-app-win-x64. If your build directory is not out, you can

pass the name of the directory as the buildDirectory parameter. If your

build directory is not named with a hyphen-delimited platform name, this

function will not work. However, you can pass the build path into

parseElectronApp() directly.



**Kind**: global function  

**Returns**: string - 
    

  • path to the most recently modified build directory
    • 

  

**See**: parseElectronApp  



| Param | Type | Default | Description |

| --- | --- | --- | --- |

| buildDirectory | string | "out" | 
optional - the directory to search for the latest build (path/name relative to package root or full path starting with /). Defaults to out.
 |






## parseElectronApp(buildDir) ⇒ [ElectronAppInfo](#ElectronAppInfo)

Given a directory containing an Electron app build,

or the path to the app itself (directory on Mac, executable on Windows),

return a bunch of metadata, including the path to the app's executable

and the path to the app's main file.


Format of the data returned is an object with the following properties:


    

  • executable: path to the app's executable file
    • 

  • main: path to the app's main (JS) file
    • 

  • name: name of the app
    • 

  • resourcesDir: path to the app's resources directory
    • 

  • asar: true if the app is using asar
    • 

  • platform: OS platform
    • 

  • arch: architecture
    • 

  • packageJson: the JSON.parse()'d contents of the package.json file.
    • 




**Kind**: global function  

**Returns**: [ElectronAppInfo](#ElectronAppInfo) - 
metadata about the app
  



| Param | Type | Description |

| --- | --- | --- |

| buildDir | string | 
absolute path to the build directory or the app itself
 |






## electronWaitForFunction(electronApp, fn, arg) ⇒ Promise.<void>

Wait for a function to evaluate to true in the main Electron process. This really

should be part of the Playwright API, but it's not.


This function is to electronApp.evaluate()

as page.waitForFunction() is page.evaluate().



**Kind**: global function  

**Fulfil**: void Resolves when the function returns true  



| Param | Type | Description |

| --- | --- | --- |

| electronApp | ElectronApplication | 
the Playwright ElectronApplication
 |

| fn | function | 
the function to evaluate in the main process - must return a boolean
 |

| arg | Any | 
optional - an argument to pass to the function
 |






## evaluateWithRetry(electronApp, fn, arg, retries, retryIntervalMs) ⇒ Promise.<R>

Electron's evaluate function can be flakey,

throwing an error saying the execution context has been destroyed.

This function retries the evaluation several times to see if it can

run the evaluation without an error. If it fails after the retries,

it throws the error.



**Kind**: global function  

**Returns**: Promise.<R> - 
    

  • the result of the evaluation
    • 

  



| Param | Type | Description |

| --- | --- | --- |

| electronApp | ElectronApplication | 
the Playwright ElectronApplication
 |

| fn | function | 
the function to evaluate in the main process
 |

| arg | Any | 
an argument to pass to the function
 |

| retries |  | 
the number of times to retry the evaluation
 |

| retryIntervalMs |  | 
the interval between retries
 |






## isSerializedNativeImageSuccess()

Type guard to check if a SerializedNativeImage is a success case



**Kind**: global function  




## isSerializedNativeImageError()

Type guard to check if a SerializedNativeImage is an error case



**Kind**: global function  




## retryUntilTruthy(fn, [timeoutMs], [intervalMs]) ⇒ Promise.<T>

Retries a given function until it returns a truthy value or the timeout is reached.


This offers similar functionality to Playwright's page.waitForFunction()

method – but with more flexibility and control over the retry attempts. It also defaults to ignoring common errors due to

the way that Playwright handles browser contexts.



**Kind**: global function  

**Returns**: Promise.<T> - 
    

  • A promise that resolves to the truthy value returned by the function.
    • 

  

**Throws**:



- Error 
    

  • Throws an error if the timeout is reached before a truthy value is returned.
    • 




| Param | Type | Default | Description |

| --- | --- | --- | --- |

| fn | function |  | 
The function to retry. It can return a promise or a value. It should NOT return void/undefined.
 |

| [timeoutMs] | number | 5000 | 
The maximum time in milliseconds to keep retrying the function. Defaults to 5000ms.
 |

| [intervalMs] | number | 100 | 
The delay between each retry attempt in milliseconds. Defaults to 100ms.
 |

| [options.retryTimeout] | number | 5000 | 
The maximum time in milliseconds to wait for an individual try to return a result. Defaults to 5000ms.
 |

| [options.retryPoll] | number | 200 | 
The delay between each retry attempt in milliseconds. Defaults to 200ms.
 |

| [options.retryErrorMatch] | string \| Array.<string> \| RegExp |  | 
The error message or pattern to match against. Errors that don't match will throw immediately.
 |



**Example**  

```javascript

test('my test', async () => {

  // this will fail immediately if Playwright's context gets weird:

  const oldWay = await page.waitForFunction(() => document.body.classList.contains('ready'))



 // this will not fail if Playwright's context gets weird:

  const newWay = await retryUntilTruthy(() =>

    page.evaluate(() => document.body.classList.contains('ready'))

  )

})

```




## matchesPattern()

Helper to match a string against a pattern (string or RegExp).

For strings, performs a substring match (includes).

For RegExp, tests the pattern against the value.



**Kind**: global function  




## ElectronAppInfo

Format of the data returned from parseElectronApp()



**Kind**: global typedef  

**Properties**



| Name | Type | Description |

| --- | --- | --- |

| executable | string | 
path to the Electron executable
 |

| main | string | 
path to the main (JS) file
 |

| name | string | 
name of the your application
 |

| resourcesDir | string | 
path to the resources directory
 |

| asar | boolean | 
whether the app is packaged as an asar archive
 |

| platform | string | 
'darwin', 'linux', or 'win32'
 |

| arch | string | 
'x64', 'x32', or 'arm64'
 |

| packageJson | PackageJson | 
the JSON.parse()'d contents of the package.json file.
 |






## stubDialog(app, method, value) ⇒ Promise.<void>

Stub a single dialog method. This is a convenience function that calls stubMultipleDialogs

for a single method.


Playwright does not have a way to interact with Electron dialog windows,

so this function allows you to substitute the dialog module's methods during your tests.

By stubbing the dialog module, your Electron application will not display any dialog windows,

and you can control the return value of the dialog methods. You're basically saying

"when my application calls dialog.showOpenDialog, return this value instead". This allows you

to test your application's behavior when the user selects a file, or cancels the dialog, etc.


Note: Each dialog method can only be stubbed with one value at a time, so you will want to call

stubDialog before each time that you expect your application to call the dialog method.



**Kind**: global function  

**Returns**: Promise.<void> - 
A promise that resolves when the mock is applied.
  

**Category**: Dialog  

**Fullfil**: void - A promise that resolves when the mock is applied.  

**See**: stubMultipleDialogs  



| Param | Type | Description |

| --- | --- | --- |

| app | ElectronApplication | 
The Playwright ElectronApplication instance.
 |

| method | String | 
The dialog method to mock.
 |

| value | ReturnType.<Electron.Dialog> | 
The value that your application will receive when calling this dialog method. See the Electron docs for the return value of each method.
 |



**Example**  

```ts

await stubDialog(app, 'showOpenDialog', {

 filePaths: ['/path/to/file'],

 canceled: false,

})

await clickMenuItemById(app, 'open-file')

// when time your application calls dialog.showOpenDialog,

// it will return the value you specified

```




## stubMultipleDialogs(app, mocks) ⇒ Promise.<void>

Stub methods of the Electron dialog module.


Playwright does not have a way to interact with Electron dialog windows,

so this function allows you to mock the dialog module's methods during your tests.

By mocking the dialog module, your Electron application will not display any dialog windows,

and you can control the return value of the dialog methods. You're basically saying

"when my application calls dialog.showOpenDialog, return this value instead". This allows you

to test your application's behavior when the user selects a file, or cancels the dialog, etc.



**Kind**: global function  

**Returns**: Promise.<void> - 
A promise that resolves when the mocks are applied.
  

**Category**: Dialog  

**Fullfil**: void - A promise that resolves when the mocks are applied.  



| Param | Type | Description |

| --- | --- | --- |

| app | ElectronApplication | 
The Playwright ElectronApplication instance.
 |

| mocks | Array.<DialogMethodStubPartial> | 
An array of dialog method mocks to apply.
 |



**Example**  

```ts

await stubMultipleDialogs(app, [

 {

   method: 'showOpenDialog',

   value: {

     filePaths: ['/path/to/file1', '/path/to/file2'],

     canceled: false,

   },

 },

 {

    method: 'showSaveDialog',

    value: {

      filePath: '/path/to/file',

      canceled: false,

    },

  },

])

await clickMenuItemById(app, 'save-file')

// when your application calls dialog.showSaveDialog,

// it will return the value you specified

```




## stubAllDialogs(app) ⇒ Promise.<void>

Stub all dialog methods. This is a convenience function that calls stubMultipleDialogs

for all dialog methods. This is useful if you want to ensure that dialogs are not displayed

during your tests. However, you may want to use stubDialog or stubMultipleDialogs to

control the return value of specific dialog methods (e.g. showOpenDialog) during your tests.



**Kind**: global function  

**Returns**: Promise.<void> - 
A promise that resolves when the mocks are applied.
  

**Category**: Dialog  

**Fullfil**: void - A promise that resolves when the mocks are applied.  

**See**: stubDialog  



| Param | Type | Description |

| --- | --- | --- |

| app | ElectronApplication | 
The Playwright ElectronApplication instance.
 |






## stubDialogMatchers(app, stubs, options) ⇒

Stub dialog methods with matchers that check dialog options before returning values.

This allows you to set up multiple different return values based on the dialog's

title, message, buttons, or other options.


Matchers are checked in order - the first matching stub wins.

If no stub matches, either an error is thrown (if throwOnUnmatched is true)

or the default value is returned.



**Kind**: global function  

**Returns**: 
A promise that resolves when the stubs are applied.
  

**Category**: Dialog  



| Param | Description |

| --- | --- |

| app | 
The Playwright ElectronApplication instance.
 |

| stubs | 
Array of dialog matcher stubs to apply.
 |

| options | 
Optional configuration.
 |



**Example**  

```ts

// Set up multiple dialog stubs at the start of your test

await stubDialogMatchers(app, [

  {

    method: 'showMessageBox',

    matcher: { title: /delete/i, buttons: /yes/i },

    value: { response: 1 }, // Click "Yes" for delete dialogs

  },

  {

    method: 'showMessageBox',

    matcher: { title: /save/i },

    value: { response: 0 }, // Click "Save" for save dialogs

  },

  {

    method: 'showOpenDialog',

    matcher: { title: 'Select Image' },

    value: { filePaths: ['/path/to/image.png'], canceled: false },

  },

  {

    method: 'showOpenDialog',

    matcher: {}, // Match all other open dialogs

    value: { canceled: true },

  },

])

```




## clearDialogMatchers(app) ⇒

Clear all dialog matcher stubs and restore original dialog methods.

Note: This requires the app to have stored the original methods,

which is not done by default. You may need to restart the app

to fully restore dialog functionality.



**Kind**: global function  

**Returns**: 
A promise that resolves when the stubs are cleared.
  

**Category**: Dialog  



| Param | Description |

| --- | --- |

| app | 
The Playwright ElectronApplication instance.
 |






## ipcMainEmit(electronApp, message, ...args, retryOptions) ⇒ Promise.<boolean>

Emit an ipcMain message from the main process.

This will trigger all ipcMain listeners for the message.


This does not transfer data between main and renderer processes.

It simply emits an event in the main process.



**Kind**: global function  

**Category**: IPCMain  

**Fulfil**: boolean true if there were listeners for this message  

**Reject**: Error if there are no ipcMain listeners for the event  



| Param | Type | Description |

| --- | --- | --- |

| electronApp | ElectronApplication | 
the ElectronApplication object from Playwright
 |

| message | string | 
the channel to call all ipcMain listeners for
 |

| ...args | unknown | 
one or more arguments to send
 |

| retryOptions | RetryOptions | 
optional - options for retrying upon error
 |






## ipcMainCallFirstListener(electronApp, message, ...args, retryOptions) ⇒ Promise.<unknown>

Call the first listener for a given ipcMain message in the main process

and return its result.


NOTE: ipcMain listeners usually don't return a value, but we're using

this to retrieve test data from the main process.


Generally, it's probably better to use ipcMainInvokeHandler() instead.



**Kind**: global function  

**Category**: IPCMain  

**Fulfil**: unknown resolves with the result of the function  

**Reject**: Error if there are no ipcMain listeners for the event  



| Param | Type | Description |

| --- | --- | --- |

| electronApp | ElectronApplication | 
the ElectronApplication object from Playwright
 |

| message | string | 
the channel to call the first listener for
 |

| ...args | unknown | 
one or more arguments to send
 |

| retryOptions | RetryOptions | 
optional - options for retrying upon error
 |






## ipcMainInvokeHandler(electronApp, message, ...args, retryOptions) ⇒ Promise.<unknown>

Get the return value of an ipcMain.handle() function



**Kind**: global function  

**Category**: IPCMain  

**Fulfil**: unknown resolves with the result of the function called in main process  



| Param | Type | Description |

| --- | --- | --- |

| electronApp | ElectronApplication | 
the ElectronApplication object from Playwright
 |

| message | string | 
the channel to call the first listener for
 |

| ...args | unknown | 
one or more arguments to send
 |

| retryOptions | RetryOptions | 
optional - options for retrying upon error
 |






## ipcRendererSend(page, channel, ...args, retryOptions) ⇒ Promise.<unknown>

Send an ipcRenderer.send() (to main process) from a given window.


Note: nodeIntegration must be true and contextIsolation must be false

in the webPreferences for this BrowserWindow.



**Kind**: global function  

**Category**: IPCRenderer  

**Fulfil**: unknown resolves with the result of `ipcRenderer.send()`  



| Param | Type | Description |

| --- | --- | --- |

| page | Page | 
the Playwright Page to send the ipcRenderer.send() from
 |

| channel | string | 
the channel to send the ipcRenderer.send() to
 |

| ...args | unknown | 
one or more arguments to send to the ipcRenderer.send()
 |

| retryOptions | RetryOptions | 
optional last argument - options for retrying upon error
 |






## ipcRendererInvoke(page, message, ...args, retryOptions) ⇒ Promise.<unknown>

Send an ipcRenderer.invoke() from a given window.


Note: nodeIntegration must be true and contextIsolation must be false

in the webPreferences for this window



**Kind**: global function  

**Category**: IPCRenderer  

**Fulfil**: unknown resolves with the result of ipcRenderer.invoke()  



| Param | Type | Description |

| --- | --- | --- |

| page | Page | 
the Playwright Page to send the ipcRenderer.invoke() from
 |

| message | string | 
the channel to send the ipcRenderer.invoke() to
 |

| ...args | unknown | 
one or more arguments to send to the ipcRenderer.invoke()
 |

| retryOptions | RetryOptions | 
optional last argument - options for retrying upon error
 |






## ipcRendererCallFirstListener(page, message, ...args, retryOptions) ⇒ Promise.<unknown>

Call just the first listener for a given ipcRenderer channel in a given window.

UNLIKE MOST Electron ipcRenderer listeners, this function SHOULD return a value.


This function does not send data between main and renderer processes.

It simply retrieves data from the renderer process.


Note: nodeIntegration must be true for this BrowserWindow.



**Kind**: global function  

**Category**: IPCRenderer  

**Fulfil**: unknown the result of the first `ipcRenderer.on()` listener  



| Param | Type | Description |

| --- | --- | --- |

| page | Page | 
The Playwright Page to with the ipcRenderer.on() listener
 |

| message | string | 
The channel to call the first listener for
 |

| ...args | unknown | 
optional - One or more arguments to send to the ipcRenderer.on() listener
 |

| retryOptions | RetryOptions | 
optional - options for retrying upon error
 |






## ipcRendererEmit(page, message, ...args, retryOptions) ⇒ Promise.<boolean>

Emit an IPC message to a given window.

This will trigger all ipcRenderer listeners for the message.


This does not transfer data between main and renderer processes.

It simply emits an event in the renderer process.


Note: nodeIntegration must be true for this window



**Kind**: global function  

**Category**: IPCRenderer  

**Fulfil**: boolean true if the event was emitted  

**Reject**: Error if there are no ipcRenderer listeners for the event  



| Param | Type | Description |

| --- | --- | --- |

| page | Page | 
the Playwright Page to with the ipcRenderer.on() listener
 |

| message | string | 
the channel to call all ipcRenderer listeners for
 |

| ...args | unknown | 
optional - one or more arguments to send
 |

| retryOptions | RetryOptions | 
optional - options for retrying upon error
 |






## clickMenuItemById(electronApp, id) ⇒ Promise.<void>

Execute the .click() method on the element with the given id.

NOTE: All menu testing functions will only work with items in the

application menu.



**Kind**: global function  

**Category**: Menu  

**Fulfil**: void resolves with the result of the `click()` method - probably `undefined`  



| Param | Type | Description |

| --- | --- | --- |

| electronApp | ElectronApplication | 
the Electron application object (from Playwright)
 |

| id | string | 
the id of the MenuItem to click
 |






## clickMenuItem(electronApp, property, value) ⇒ Promise.<void>

Click the first matching menu item by any of its properties. This is

useful for menu items that don't have an id. HOWEVER, this is not as fast

or reliable as using clickMenuItemById() if the menu item has an id.


NOTE: All menu testing functions will only work with items in the

application menu.



**Kind**: global function  

**Category**: Menu  

**Fulfil**: void resolves with the result of the `click()` method - probably `undefined`  



| Param | Type | Description |

| --- | --- | --- |

| electronApp | ElectronApplication | 
the Electron application object (from Playwright)
 |

| property | String | 
a property of the MenuItem to search for
 |

| value | String \| Number \| Boolean | 
the value of the property to search for
 |






## getMenuItemAttribute(electronApp, menuId, attribute) ⇒ Promise.<string>

Get a given attribute the MenuItem with the given id.



**Kind**: global function  

**Category**: Menu  

**Fulfil**: string resolves with the attribute value  



| Param | Type | Description |

| --- | --- | --- |

| electronApp | ElectronApplication | 
the Electron application object (from Playwright)
 |

| menuId | string | 
the id of the MenuItem to retrieve the attribute from
 |

| attribute | string | 
the attribute to retrieve
 |






## getMenuItemById(electronApp, menuId) ⇒ Promise.<MenuItemPartial>

Get information about the MenuItem with the given id. Returns serializable values including

primitives, objects, arrays, and other non-recursive data structures.



**Kind**: global function  

**Category**: Menu  

**Fulfil**: MenuItemPartial the MenuItem with the given id  



| Param | Type | Description |

| --- | --- | --- |

| electronApp | ElectronApplication | 
the Electron application object (from Playwright)
 |

| menuId | string | 
the id of the MenuItem to retrieve
 |






## getApplicationMenu(electronApp) ⇒ Promise.<Array.<MenuItemPartial>>

Get the current state of the application menu. Contains serializable values including

primitives, objects, arrays, and other non-recursive data structures.

Very similar to menu

construction template structure

in Electron.



**Kind**: global function  

**Category**: Menu  

**Fulfil**: MenuItemPartial[] an array of MenuItem-like objects  



| Param | Type | Description |

| --- | --- | --- |

| electronApp | ElectronApplication | 
the Electron application object (from Playwright)
 |






## findMenuItem(electronApp, property, value, menuItems) ⇒ Promise.<MenuItemPartial>

Find a MenuItem by any of its properties



**Kind**: global function  

**Category**: Menu  

**Fulfil**: MenuItemPartial the first MenuItem with the given property and value  



| Param | Type | Description |

| --- | --- | --- |

| electronApp | ElectronApplication | 
the Electron application object (from Playwright)
 |

| property | string | 
the property to search for
 |

| value | string | 
the value to search for
 |

| menuItems | MenuItemPartial \| Array.<MenuItemPartial> | 
optional - single MenuItem or array - if not provided, will be retrieved from the application menu
 |






## waitForMenuItem(electronApp, id) ⇒ Promise.<void>

Wait for a MenuItem to exist



**Kind**: global function  

**Category**: Menu  

**Fulfil**: void resolves when the MenuItem is found  



| Param | Type | Description |

| --- | --- | --- |

| electronApp | ElectronApplication | 
the Electron application object (from Playwright)
 |

| id | string | 
the id of the MenuItem to wait for
 |






## waitForMenuItemStatus(electronApp, id, property, value) ⇒ Promise.<void>

Wait for a MenuItem to have a specific attribute value.

For example, wait for a MenuItem to be enabled... or be visible.. etc



**Kind**: global function  

**Category**: Menu  

**Fulfil**: void resolves when the MenuItem with correct status is found  



| Param | Type | Description |

| --- | --- | --- |

| electronApp | ElectronApplication | 
the Electron application object (from Playwright)
 |

| id | string | 
the id of the MenuItem to wait for
 |

| property | string | 
the property to search for
 |

| value | string \| number \| boolean | 
the value to search for
 |






## addTimeoutToPromise(promise, timeoutMs, timeoutMessage) ⇒ Promise.<T>

Add a timeout to any Promise



**Kind**: global function  

**Returns**: Promise.<T> - 
the result of the original promise if it resolves before the timeout
  

**Category**: Utilities  

**See**: addTimeout  



| Param | Default | Description |

| --- | --- | --- |

| promise |  | 
the promise to add a timeout to - must be a Promise
 |

| timeoutMs | 5000 | 
the timeout in milliseconds - defaults to 5000
 |

| timeoutMessage |  | 
optional - the message to return if the timeout is reached
 |






## addTimeout(functionName, timeoutMs, timeoutMessage, ...args) ⇒ Promise.<T>

Add a timeout to any helper function from this library which returns a Promise.



**Kind**: global function  

**Returns**: Promise.<T> - 
the result of the helper function if it resolves before the timeout
  

**Category**: Utilities  



| Param | Default | Description |

| --- | --- | --- |

| functionName |  | 
the name of the helper function to call
 |

| timeoutMs | 5000 | 
the timeout in milliseconds - defaults to 5000
 |

| timeoutMessage |  | 
optional - the message to return if the timeout is reached
 |

| ...args |  | 
any arguments to pass to the helper function
 |






## retry(fn, [options]) ⇒ Promise.<T>

Retries a function until it returns without throwing an error.


Starting with Electron 27, Playwright can get very flakey when running code in Electron's main or renderer processes.

It will often throw errors like "context or browser has been closed" or "Promise was collected" for no apparent reason.

This function retries a given function until it returns without throwing one of these errors, or until the timeout is reached.



**Kind**: global function  

**Returns**: Promise.<T> - 
A promise that resolves with the result of the function or rejects with an error or timeout message.
  

**Category**: Utilities  



| Param | Type | Default | Description |

| --- | --- | --- | --- |

| fn | function |  | 
The function to retry.
 |

| [options] | RetryOptions | {} | 
The options for retrying the function.
 |

| [options.timeout] | number | 5000 | 
The maximum time to wait before giving up in milliseconds.
 |

| [options.poll] | number | 200 | 
The delay between each retry attempt in milliseconds.
 |

| [options.errorMatch] | string \| Array.<string> \| RegExp | "['context or browser has been closed', 'Promise was collected', 'Execution context was destroyed']" | 
String(s) or regex to match against error message. If the error does not match, it will throw immediately. If it does match, it will retry.
 |



**Example**  

You can simply wrap your Playwright calls in this function to make them more reliable:



```javascript

test('my test', async () => {

  // instead of this:

  const oldWayRenderer = await page.evaluate(() => document.body.classList.contains('active'))

  const oldWayMain = await electronApp.evaluate(({}) => document.body.classList.contains('active'))

  // use this:

  const newWay = await retry(() =>

    page.evaluate(() => document.body.classList.contains('active'))

  )

  // note the `() =>` in front of the original function call

  // and the `await` keyword in front of `retry`,

  // but NOT in front of `page.evaluate`

})

```




## setRetryOptions(options) ⇒

Sets the default retry() options. These options will be used for all subsequent calls to retry() unless overridden.

You can reset the defaults at any time by calling resetRetryOptions().



**Kind**: global function  

**Returns**: 
The updated retry options.
  

**Category**: Utilities  



| Param | Description |

| --- | --- |

| options | 
A partial object containing the retry options to be set.
 |






## getRetryOptions() ⇒

Gets the current default retry options.



**Kind**: global function  

**Returns**: 
The current retry options.
  

**Category**: Utilities  




## resetRetryOptions()

Resets the retry options to their default values.


The default values are:


    

  • retries: 20
    • 

  • intervalMs: 200
    • 

  • timeoutMs: 5000
    • 

  • errorMatch: 'context or browser has been closed'
    • 




**Kind**: global function  

**Category**: Utilities  




## errToString(err) ⇒

Converts an unknown error to a string representation.


This function handles different types of errors and attempts to convert them

to a string in a meaningful way. It checks if the error is an object with a

toString method and uses that method if available. If the error is a string,

it returns the string directly. For other types, it converts the error to a

JSON string.



**Kind**: global function  

**Returns**: 
A string representation of the error.
  

**Category**: Utilities  



| Param | Description |

| --- | --- |

| err | 
The unknown error to be converted to a string.
 |






## getWindowByUrl(electronApp, pattern, options) ⇒

Get all windows whose URL matches the given pattern.



**Kind**: global function  

**Returns**: 
An array of matching Pages
  

**Category**: Window Helpers  



| Param | Description |

| --- | --- |

| electronApp | 
The Playwright ElectronApplication
 |

| pattern | 
A string (substring match) or RegExp to match against the URL
 |

| options | 
Options with all: true to return all matches
 |



**Example**  

```ts

const allSettingsWindows = await getWindowByUrl(app, '/settings', { all: true })

```




## getWindowByTitle(electronApp, pattern, options) ⇒

Get all windows whose title matches the given pattern.



**Kind**: global function  

**Returns**: 
An array of matching Pages
  

**Category**: Window Helpers  



| Param | Description |

| --- | --- |

| electronApp | 
The Playwright ElectronApplication
 |

| pattern | 
A string (substring match) or RegExp to match against the title
 |

| options | 
Options with all: true to return all matches
 |



**Example**  

```ts

const allNumberedWindows = await getWindowByTitle(app, /Window \d+/, { all: true })

```




## getWindowByMatcher(electronApp, matcher, options) ⇒

Get all windows that match the provided matcher function.



**Kind**: global function  

**Returns**: 
An array of matching Pages
  

**Category**: Window Helpers  



| Param | Description |

| --- | --- |

| electronApp | 
The Playwright ElectronApplication
 |

| matcher | 
A function that receives a Page and returns true if it matches
 |

| options | 
Options with all: true to return all matches
 |



**Example**  

```ts

const allLargeWindows = await getWindowByMatcher(app, async (page) => {

  const size = await page.viewportSize()

  return size && size.width > 1000

}, { all: true })

```




## waitForWindowByUrl(electronApp, pattern, options) ⇒

Wait for a window whose URL matches the given pattern.


This function checks existing windows first, then listens for new windows.

It uses polling to handle windows that may have their URL change after opening.



**Kind**: global function  

**Returns**: 
The matching Page
  

**Category**: Window Helpers  

**Throws**:



- 
Error if timeout is reached before a matching window is found



| Param | Description |

| --- | --- |

| electronApp | 
The Playwright ElectronApplication
 |

| pattern | 
A string (substring match) or RegExp to match against the URL
 |

| options | 
Optional timeout and interval settings
 |



**Example**  

```ts

// Click something that opens a new window, then wait for it

await page.click('#open-settings')

const settingsWindow = await waitForWindowByUrl(app, '/settings', { timeout: 5000 })

```




## waitForWindowByTitle(electronApp, pattern, options) ⇒

Wait for a window whose title matches the given pattern.


This function checks existing windows first, then listens for new windows.

It uses polling to handle windows that may have their title change after opening.



**Kind**: global function  

**Returns**: 
The matching Page
  

**Category**: Window Helpers  

**Throws**:



- 
Error if timeout is reached before a matching window is found



| Param | Description |

| --- | --- |

| electronApp | 
The Playwright ElectronApplication
 |

| pattern | 
A string (substring match) or RegExp to match against the title
 |

| options | 
Optional timeout and interval settings
 |



**Example**  

```ts

// Wait for a window with a specific title to appear

const prefsWindow = await waitForWindowByTitle(app, 'Preferences', { timeout: 5000 })

```




## waitForWindowByMatcher(electronApp, matcher, options) ⇒

Wait for a window that matches the provided matcher function.


This function:


    

  1. Checks existing windows first
    2. 

  2. Listens for new window events
    3. 

  3. Polls existing windows periodically (to catch URL/title changes)
    4. 




**Kind**: global function  

**Returns**: 
The matching Page
  

**Category**: Window Helpers  

**Throws**:



- 
Error if timeout is reached before a matching window is found



| Param | Description |

| --- | --- |

| electronApp | 
The Playwright ElectronApplication
 |

| matcher | 
A function that receives a Page and returns true if it matches
 |

| options | 
Optional timeout and interval settings
 |



**Example**  

```ts

const window = await waitForWindowByMatcher(app, async (page) => {

  const title = await page.title()

  return title.startsWith('Document:')

}, { timeout: 10000 })

```