149 lines
4.1 KiB
Markdown
149 lines
4.1 KiB
Markdown
# Environment Variables
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> Control application configuration and behavior without changing code.
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Certain Electron behaviors are controlled by environment variables because they
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are initialized earlier than the command line flags and the app's code.
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POSIX shell example:
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```sh
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$ export ELECTRON_ENABLE_LOGGING=true
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$ electron
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```
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Windows console example:
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```powershell
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> set ELECTRON_ENABLE_LOGGING=true
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> electron
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```
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## Production Variables
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The following environment variables are intended primarily for use at runtime
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in packaged Electron applications.
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### `NODE_OPTIONS`
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Electron includes support for a subset of Node's [`NODE_OPTIONS`](https://nodejs.org/api/cli.html#cli_node_options_options). The majority are supported with the exception of those which conflict with Chromium's use of BoringSSL.
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Example:
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```sh
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export NODE_OPTIONS="--no-warnings --max-old-space-size=2048"
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```
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Unsupported options are:
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```sh
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--use-bundled-ca
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--force-fips
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--enable-fips
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--openssl-config
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--use-openssl-ca
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```
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`NODE_OPTIONS` are explicitly disallowed in packaged apps, except for the following:
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```sh
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--max-http-header-size
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--http-parser
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```
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### `GOOGLE_API_KEY`
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Geolocation support in Electron requires the use of Google Cloud Platform's
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geolocation webservice. To enable this feature, acquire a
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[Google API key](https://developers.google.com/maps/documentation/geolocation/get-api-key)
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and place the following code in your main process file, before opening any
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browser windows that will make geolocation requests:
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```javascript
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process.env.GOOGLE_API_KEY = 'YOUR_KEY_HERE'
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```
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By default, a newly generated Google API key may not be allowed to make geolocation requests.
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To enable the geolocation webservice for your project, enable it through the
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[API library](https://console.cloud.google.com/apis/library).
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N.B. You will need to add a
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[Billing Account](https://cloud.google.com/billing/docs/how-to/payment-methods#add_a_payment_method)
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to the project associated to the API key for the geolocation webservice to work.
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### `ELECTRON_NO_ASAR`
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Disables ASAR support. This variable is only supported in forked child processes
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and spawned child processes that set `ELECTRON_RUN_AS_NODE`.
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### `ELECTRON_RUN_AS_NODE`
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Starts the process as a normal Node.js process.
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In this mode, you will be able to pass [cli options](https://nodejs.org/api/cli.html) to Node.js as
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you would when running the normal Node.js executable, with the exception of the following flags:
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* "--openssl-config"
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* "--use-bundled-ca"
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* "--use-openssl-ca",
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* "--force-fips"
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* "--enable-fips"
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These flags are disabled owing to the fact that Electron uses BoringSSL instead of OpenSSL when building Node.js'
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`crypto` module, and so will not work as designed.
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### `ELECTRON_NO_ATTACH_CONSOLE` _Windows_
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Don't attach to the current console session.
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### `ELECTRON_FORCE_WINDOW_MENU_BAR` _Linux_
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Don't use the global menu bar on Linux.
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### `ELECTRON_TRASH` _Linux_
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Set the trash implementation on Linux. Default is `gio`.
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Options:
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* `gvfs-trash`
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* `trash-cli`
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* `kioclient5`
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* `kioclient`
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## Development Variables
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The following environment variables are intended primarily for development and
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debugging purposes.
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### `ELECTRON_ENABLE_LOGGING`
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Prints Chrome's internal logging to the console.
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### `ELECTRON_LOG_ASAR_READS`
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When Electron reads from an ASAR file, log the read offset and file path to
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the system `tmpdir`. The resulting file can be provided to the ASAR module
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to optimize file ordering.
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### `ELECTRON_ENABLE_STACK_DUMPING`
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Prints the stack trace to the console when Electron crashes.
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This environment variable will not work if the `crashReporter` is started.
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### `ELECTRON_DEFAULT_ERROR_MODE` _Windows_
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Shows the Windows's crash dialog when Electron crashes.
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This environment variable will not work if the `crashReporter` is started.
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### `ELECTRON_OVERRIDE_DIST_PATH`
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When running from the `electron` package, this variable tells
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the `electron` command to use the specified build of Electron instead of
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the one downloaded by `npm install`. Usage:
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```sh
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export ELECTRON_OVERRIDE_DIST_PATH=/Users/username/projects/electron/out/Testing
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```
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