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url: https://adecore.dev/shell/bridge.md
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# Bridge

`@adecore/shell/bridge` holds the shapes that cross IPC between the shell and its page. It imports nothing from Electron, so a preload and the page import it as well as the main process. A preload hands every answer to the page as `unknown`; one shape in one place keeps both ends from drifting apart without the compiler saying so.

| Name | What it is |
|---|---|
| `MenuSpec`, `MenuNode`, `MENU_ROLES`, `MenuRole` | The [application menu](/shell/menu) the page builds. |
| `UpdateState` | Where [updating](/shell/updater) stands. |
| `ThemeState` | The [theme](/shell/theme) a page reports. |
| `compareVersions`, `isVersion` | One ordering of versions for the shell and the page, so release notes land under the right heading. A version that is not a plain `1.2.3` sorts below every one that is. |