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feat: add new nativeTheme API (#19656)

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* feat: add new nativeTheme API

* chore: deprecate and clean up old systemPreferences theme APIs in favor of new nativeTheme module

* chore: clean up and deprecate things per feedback

* chore: add tests for deprecate and clean up invert impl

* build: when is a boolean not a boolean???
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Samuel Attard 2019-08-14 13:42:55 -07:00 • committed by GitHub
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# nativeTheme
> Read and respond to changes in Chromium's native color theme.
Process: [Main](../glossary.md#main-process), [Renderer](../glossary.md#renderer-process)
## Events
The `nativeTheme` module emits the following events:
### Event: 'updated'
Emitted when something in the underlying NativeTheme has changed. This normally
means that either the value of `shouldUseDarkColors`,
`shouldUseHighContrastColors` or `shouldUseInvertedColorScheme` has changed.
You will have to check them to determine which one has changed.
## Properties
The `nativeTheme` module has the following properties:
### `nativeTheme.shouldUseDarkColors` _Readonly_
A `Boolean` for if the OS / Chromium currently has a dark mode enabled or is
being instructed to show a dark-style UI.
### `nativeTheme.shouldUseHighContrastColors` _macOS_ _Windows_ _Readonly_
A `Boolean` for if the OS / Chromium currently has high-contrast mode enabled
or is being instructed to show a high-constrast UI.
### `nativeTheme.shouldUseInvertedColorScheme` _macOS_ _Windows_ _Readonly_
A `Boolean` for if the OS / Chromium currently has an inverted color scheme
or is being instructed to use an inverted color scheme.