docs(autoUpdater): document static storage strategy (#42690)

* docs: `autoUpdater` static storage strategy

* summary must be followed by newline

* lint: fix whitespace for code blocks

* lint: `js` -> `javascript`

* bump

* `javascript` -> `js`

* bump
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@ -10,6 +10,114 @@ The easiest and officially supported one is taking advantage of the built-in
[Squirrel](https://github.com/Squirrel) framework and [Squirrel](https://github.com/Squirrel) framework and
Electron's [autoUpdater](../api/auto-updater.md) module. Electron's [autoUpdater](../api/auto-updater.md) module.
## Using cloud object storage (serverless)
For a simple serverless update flow, Electron's autoUpdater module can
check if updates are available by pointing to a static storage URL
containing latest release metadata.
When a new release is available, this metadata needs to be published to
cloud storage alongside the release itself. The metadata format is
different for macOS and Windows.
### Publishing release metadata
With Electron Forge, you can set up static file storage updates by publishing
metadata artifacts from the ZIP Maker (macOS) with `macUpdateManifestBaseUrl`
and the Squirrel.Windows Maker (Windows) with `remoteReleases`.
See Forge's [Auto updating from S3](https://www.electronforge.io/config/publishers/s3#auto-updating-from-s3)
guide for an end-to-end example.
<details>
<summary>Manual publishing</summary>
On macOS, Squirrel.Mac can receive updates by reading a `releases.json` file with the
following JSON format:
```json title='releases.json'
{
"currentRelease": "1.2.3",
"releases": [
{
"version": "1.2.1",
"updateTo": {
"version": "1.2.1",
"pub_date": "2023-09-18T12:29:53+01:00",
"notes": "Theses are some release notes innit",
"name": "1.2.1",
"url": "https://mycompany.example.com/myapp/releases/myrelease"
}
},
{
"version": "1.2.3",
"updateTo": {
"version": "1.2.3",
"pub_date": "2024-09-18T12:29:53+01:00",
"notes": "Theses are some more release notes innit",
"name": "1.2.3",
"url": "https://mycompany.example.com/myapp/releases/myrelease3"
}
}
]
}
```
On Windows, Squirrel.Windows can receive updates by reading from the RELEASES
file generated during the build process. This file details the `.nupkg` delta
package to update to.
```plaintext title='RELEASES'
B0892F3C7AC91D72A6271FF36905FEF8FE993520 electron-fiddle-0.36.3-full.nupkg 103298365
```
These files should live in the same directory as your release, under a folder
structure that is aware of your app's platform and architecture.
For example:
```plaintext
my-app-updates/
├─ darwin/
│ ├─ x64/
│ │ ├─ my-app-1.0.0-darwin-x64.zip
│ │ ├─ my-app-1.1.0-darwin-x64.zip
│ │ ├─ RELEASES.json
│ ├─ arm64/
│ │ ├─ my-app-1.0.0-darwin-arm64.zip
│ │ ├─ my-app-1.1.0-darwin-arm64.zip
│ │ ├─ RELEASES.json
├─ win32/
│ ├─ x64/
│ │ ├─ my-app-1.0.0-win32-x64.exe
│ │ ├─ my-app-1.0.0-win32-x64.nupkg
│ │ ├─ my-app-1.1.0-win32-x64.exe
│ │ ├─ my-app-1.1.0-win32-x64.nupkg
│ │ ├─ RELEASES
```
</details>
### Reading release metadata
The easiest way to consume metadata is by installing [update-electron-app][],
a drop-in Node.js module that sets up autoUpdater and prompts the user with
a native dialog.
For static storage updates, point the `updateSource.baseUrl` parameter to
the directory containing your release metadata files.
```js title="main.js" @ts-nocheck
const { updateElectronApp, UpdateSourceType } = require('update-electron-app')
updateElectronApp({
updateSource: {
type: UpdateSourceType.StaticStorage,
baseUrl: `https://my-bucket.s3.amazonaws.com/my-app-updates/${process.platform}/${process.arch}`
}
})
```
## Using update.electronjs.org ## Using update.electronjs.org
The Electron team maintains [update.electronjs.org][], a free and open-source The Electron team maintains [update.electronjs.org][], a free and open-source
@ -151,6 +259,10 @@ server-communication aspect of the process by loading your update from a local d
::: :::
## Update server specification
A Squirrel-compatible update server has different
[vercel]: https://vercel.com [vercel]: https://vercel.com
[hazel]: https://github.com/vercel/hazel [hazel]: https://github.com/vercel/hazel
[nuts]: https://github.com/GitbookIO/nuts [nuts]: https://github.com/GitbookIO/nuts