electron/docs/tutorial/planned-breaking-changes.md

# Planned Breaking API Changes

The following list includes the APIs that will be removed in Electron 2.0.

There is no timetable for when this release will occur but deprecation
warnings will be added at least 90 days beforehand.

## `BrowserWindow`

```js
// Deprecated
let optionsA = {webPreferences: {blinkFeatures: ''}}
let windowA = new BrowserWindow(optionsA)
// Replace with
let optionsB = {webPreferences: {enableBlinkFeatures: ''}}
let windowB = new BrowserWindow(optionsB)
```

## `clipboard`

```js
// Deprecated
clipboard.readRtf()
// Replace with
clipboard.readRTF()

// Deprecated
clipboard.writeRtf()
// Replace with
clipboard.writeRTF()

// Deprecated
clipboard.readHtml()
// Replace with
clipboard.readHTML()

// Deprecated
clipboard.writeHtml()
// Replace with
clipboard.writeHTML()
```

## `nativeImage`

```js
// Deprecated
nativeImage.toPng()
// Replace with
nativeImage.toPNG()

// Deprecated
nativeImage.toJpeg()
// Replace with
nativeImage.toJPEG()
```

## `process`

```js
// Deprecated
process.versions['atom-shell']
// Replace with
process.versions.electron
```

## `Tray`

```js
// Deprecated
tray.setHighlightMode(true)
// Replace with
tray.setHighlightMode('on')

// Deprecated
tray.setHighlightMode(false)
// Replace with
tray.setHighlightMode('off')
```

## `webContents`

```js
// Deprecated
webContents.openDevTools({detach: true})
// Replace with
webContents.openDevTools({mode: 'detach'})
```

## Node Headers URL

This is the URL specified as `disturl` in a `.npmrc` file or as the `--dist-url`
command line flag when building native Node modules.

Deprecated: https://atom.io/download/atom-shell

Replace with: https://atom.io/download/electron