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# API Contract
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Breaking changes will be documented here, and deprecation warnings added to JS code where possible, at least [one major version ](../tutorial/electron-versioning.md#semver ) before the change is made.
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# `FIXME` comments
The `FIXME` string is used in code comments to denote things that should be fixed for future releases. See https://github.com/electron/electron/search?q=fixme
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# Planned Breaking API Changes (4.0)
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The following list includes the breaking API changes planned for Electron 4.0.
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## `app.makeSingleInstance`
```js
// Deprecated
app.makeSingleInstance(function (argv, cwd) {
})
// Replace with
app.requestSingleInstanceLock()
app.on('second-instance', function (argv, cwd) {
})
```
## `app.releaseSingleInstance`
```js
// Deprecated
app.releaseSingleInstance()
// Replace with
app.releaseSingleInstanceLock()
```
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# Planned Breaking API Changes (3.0)
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The following list includes the breaking API changes planned for Electron 3.0.
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## `app`
```js
// Deprecated
app.getAppMemoryInfo()
// Replace with
app.getAppMetrics()
```
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## `BrowserWindow`
```js
// Deprecated
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let optionsA = {webPreferences: {blinkFeatures: ''}}
let windowA = new BrowserWindow(optionsA)
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// Replace with
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let optionsB = {webPreferences: {enableBlinkFeatures: ''}}
let windowB = new BrowserWindow(optionsB)
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// Deprecated
window.on('app-command', (e, cmd) => {
if (cmd === 'media-play_pause') {
// do something
}
})
// Replace with
window.on('app-command', (e, cmd) => {
if (cmd === 'media-play-pause') {
// do something
}
})
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```
## `clipboard`
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```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()
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```
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## `crashReporter`
```js
// Deprecated
crashReporter.start({
companyName: 'Crashly',
submitURL: 'https://crash.server.com',
autoSubmit: true
})
// Replace with
crashReporter.start({
companyName: 'Crashly',
submitURL: 'https://crash.server.com',
uploadToServer: true
})
```
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## `nativeImage`
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```js
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// Deprecated
nativeImage.createFromBuffer(buffer, 1.0)
// Replace with
nativeImage.createFromBuffer(buffer, {
scaleFactor: 1.0
})
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```
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## `screen`
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```js
// Deprecated
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screen.getMenuBarHeight()
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// Replace with
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screen.getPrimaryDisplay().workArea
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```
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## `session`
```js
// Deprecated
ses.setCertificateVerifyProc(function (hostname, certificate, callback) {
callback(true)
})
// Replace with
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ses.setCertificateVerifyProc(function (request, callback) {
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callback(0)
})
```
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## `Tray`
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```js
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// Deprecated
tray.setHighlightMode(true)
// Replace with
tray.setHighlightMode('on')
// Deprecated
tray.setHighlightMode(false)
// Replace with
tray.setHighlightMode('off')
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```
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## `webContents`
```js
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// Deprecated
webContents.openDevTools({detach: true})
// Replace with
webContents.openDevTools({mode: 'detach'})
```
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## `webFrame`
```js
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// Deprecated
webFrame.registerURLSchemeAsSecure('app')
// Replace with
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protocol.registerStandardSchemes(['app'], {secure: true})
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// Deprecated
webFrame.registerURLSchemeAsPrivileged('app', {secure: true})
// Replace with
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protocol.registerStandardSchemes(['app'], {secure: true})
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```
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## 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
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# Breaking API Changes (2.0)
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The following list includes the breaking API changes made in Electron 2.0.
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## `BrowserWindow`
```js
// Deprecated
let optionsA = {titleBarStyle: 'hidden-inset'}
let windowA = new BrowserWindow(optionsA)
// Replace with
let optionsB = {titleBarStyle: 'hiddenInset'}
let windowB = new BrowserWindow(optionsB)
```
## `menu`
```js
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// Removed
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menu.popup(browserWindow, 100, 200, 2)
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// Replaced with
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menu.popup(browserWindow, {x: 100, y: 200, positioningItem: 2})
```
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## `nativeImage`
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```js
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// Removed
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nativeImage.toPng()
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// Replaced with
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nativeImage.toPNG()
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// Removed
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nativeImage.toJpeg()
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// Replaced with
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nativeImage.toJPEG()
```
## `process`
* `process.versions.electron` and `process.version.chrome` will be made
read-only properties for consistency with the other `process.versions`
properties set by Node.
## `webContents`
```js
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// Removed
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webContents.setZoomLevelLimits(1, 2)
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// Replaced with
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webContents.setVisualZoomLevelLimits(1, 2)
```
## `webFrame`
```js
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// Removed
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webFrame.setZoomLevelLimits(1, 2)
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// Replaced with
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webFrame.setVisualZoomLevelLimits(1, 2)
```
## `<webview>`
```js
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// Removed
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webview.setZoomLevelLimits(1, 2)
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// Replaced with
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webview.setVisualZoomLevelLimits(1, 2)
```
## Duplicate ARM Assets
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Each Electron release includes two identical ARM builds with slightly different
filenames, like `electron-v1.7.3-linux-arm.zip` and
`electron-v1.7.3-linux-armv7l.zip` . The asset with the `v7l` prefix was added
to clarify to users which ARM version it supports, and to disambiguate it from
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future armv6l and arm64 assets that may be produced.
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The file _without the prefix_ is still being published to avoid breaking any
setups that may be consuming it. Starting at 2.0, the un-prefixed file will
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no longer be published.
For details, see
[6986 ](https://github.com/electron/electron/pull/6986 )
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and
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[7189 ](https://github.com/electron/electron/pull/7189 ).