139 lines
5.3 KiB
Markdown
139 lines
5.3 KiB
Markdown
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# @electron/get
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> Download Electron release artifacts
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[](https://circleci.com/gh/electron/get)
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[](https://npm.im/@electron/get)
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## Usage
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### Simple: Downloading an Electron Binary ZIP
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```typescript
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import { download } from '@electron/get';
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// NB: Use this syntax within an async function, Node does not have support for
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// top-level await as of Node 12.
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const zipFilePath = await download('4.0.4');
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```
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### Advanced: Downloading a macOS Electron Symbol File
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```typescript
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import { downloadArtifact } from '@electron/get';
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// NB: Use this syntax within an async function, Node does not have support for
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// top-level await as of Node 12.
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const zipFilePath = await downloadArtifact({
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version: '4.0.4',
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platform: 'darwin',
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artifactName: 'electron',
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artifactSuffix: 'symbols',
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arch: 'x64',
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});
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```
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### Specifying a mirror
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To specify another location to download Electron assets from, the following options are
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available:
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* `mirrorOptions` Object
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* `mirror` String (optional) - The base URL of the mirror to download from.
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* `nightlyMirror` String (optional) - The Electron nightly-specific mirror URL.
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* `customDir` String (optional) - The name of the directory to download from, often scoped by version number.
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* `customFilename` String (optional) - The name of the asset to download.
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* `resolveAssetURL` Function (optional) - A function allowing customization of the url used to download the asset.
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Anatomy of a download URL, in terms of `mirrorOptions`:
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```
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https://github.com/electron/electron/releases/download/v4.0.4/electron-v4.0.4-linux-x64.zip
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------------------------------------------------------- -----------------------------
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mirror / nightlyMirror | | customFilename
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------
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customDir
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```
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Example:
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```typescript
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import { download } from '@electron/get';
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const zipFilePath = await download('4.0.4', {
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mirrorOptions: {
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mirror: 'https://mirror.example.com/electron/',
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customDir: 'custom',
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customFilename: 'unofficial-electron-linux.zip'
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}
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});
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// Will download from https://mirror.example.com/electron/custom/unofficial-electron-linux.zip
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const nightlyZipFilePath = await download('8.0.0-nightly.20190901', {
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mirrorOptions: {
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nightlyMirror: 'https://nightly.example.com/',
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customDir: 'nightlies',
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customFilename: 'nightly-linux.zip'
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}
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});
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// Will download from https://nightly.example.com/nightlies/nightly-linux.zip
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```
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`customDir` can have the placeholder `{{ version }}`, which will be replaced by the version
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specified (without the leading `v`). For example:
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```javascript
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const zipFilePath = await download('4.0.4', {
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mirrorOptions: {
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mirror: 'https://mirror.example.com/electron/',
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customDir: 'version-{{ version }}',
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platform: 'linux',
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arch: 'x64'
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}
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});
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// Will download from https://mirror.example.com/electron/version-4.0.4/electron-v4.0.4-linux-x64.zip
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```
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#### Using environment variables for mirror options
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Mirror options can also be specified via the following environment variables:
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* `ELECTRON_CUSTOM_DIR` - Specifies the custom directory to download from.
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* `ELECTRON_CUSTOM_FILENAME` - Specifies the custom file name to download.
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* `ELECTRON_MIRROR` - Specifies the URL of the server to download from if the version is not a nightly version.
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* `ELECTRON_NIGHTLY_MIRROR` - Specifies the URL of the server to download from if the version is a nightly version.
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### Overriding the version downloaded
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The version downloaded can be overriden by setting the `ELECTRON_CUSTOM_VERSION` environment variable.
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Setting this environment variable will override the version passed in to `download` or `downloadArtifact`.
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## How It Works
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This module downloads Electron to a known place on your system and caches it
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so that future requests for that asset can be returned instantly. The cache
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locations are:
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* Linux: `$XDG_CACHE_HOME` or `~/.cache/electron/`
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* MacOS: `~/Library/Caches/electron/`
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* Windows: `%LOCALAPPDATA%/electron/Cache` or `~/AppData/Local/electron/Cache/`
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By default, the module uses [`got`](https://github.com/sindresorhus/got) as the
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downloader. As a result, you can use the same [options](https://github.com/sindresorhus/got#options)
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via `downloadOptions`.
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### Progress Bar
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By default, a progress bar is shown when downloading an artifact for more than 30 seconds. To
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disable, set the `ELECTRON_GET_NO_PROGRESS` environment variable to any non-empty value, or set
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`quiet` to `true` in `downloadOptions`. If you need to monitor progress yourself via the API, set
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`getProgressCallback` in `downloadOptions`, which has the same function signature as `got`'s
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[`downloadProgress` event callback](https://github.com/sindresorhus/got#ondownloadprogress-progress).
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### Proxies
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Downstream packages should utilize the `initializeProxy` function to add HTTP(S) proxy support. If
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the environment variable `ELECTRON_GET_USE_PROXY` is set, it is called automatically.
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