Split up debugging-main-process.md, add electron-inspector guide
- Move the debugging guides for VSCode and node-inspector into separate files. - Add instructions for using electron-inspector to the node-inspector guide. - Remove note in node-inspector guide about crashing when inspecting `process` (it was fixed a long time ago: https://github.com/nodejs/node-v0.x-archive/issues/8205)
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Vadim Macagon
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3 changed files with 180 additions and 101 deletions
131
docs/tutorial/debugging-main-process-node-inspector.md
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docs/tutorial/debugging-main-process-node-inspector.md
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# Debugging the Main Process in node-inspector
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[`node-inspector`][node-inspector] provides a familiar DevTools GUI that can
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be used in Chrome to debug Electron's main process, however, because
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`node-inspector` relies on some native Node modules they must be rebuilt to
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target the version of Electron you wish to debug. You can either rebuild
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the `node-inspector` dependencies yourself, or let
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[`electron-inspector`][electron-inspector] do it for you, both approaches are
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covered in this document.
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**Note**: At the time of writing the latest release of `node-inspector`
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(0.12.8) can't be rebuilt to target Electron 1.3.0 or later without patching
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one of its dependencies. If you use `electron-inspector` it will take care of
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this for you.
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## Use `electron-inspector` for Debugging
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### 1. Install the [node-gyp required tools][node-gyp-required-tools]
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### 2. Install [`electron-rebuild`][electron-rebuild], if you haven't done so already.
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```shell
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npm install electron-rebuild --save-dev
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```
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### 3. Install [`electron-inspector`][electron-inspector]
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```shell
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npm install electron-inspector --save-dev
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```
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### 4. Start Electron
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Launch Electron with the `--debug` switch:
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```shell
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electron --debug=5858 your/app
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```
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or, to pause execution on the first line of JavaScript:
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```shell
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electron --debug-brk=5858 your/app
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```
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### 5. Start electron-inspector
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On macOS / Linux:
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```shell
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node_modules/.bin/electron-inspector
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```
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On Windows:
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```shell
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node_modules\\.bin\\electron-inspector
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```
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`electron-inspector` will need to rebuild `node-inspector` dependencies on the
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first run, and any time you change your Electron version. The rebuild process
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may require an internet connection to download Node headers and libs, and may
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take a few minutes.
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### 6. Load the debugger UI
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Open http://127.0.0.1:8080/debug?ws=127.0.0.1:8080&port=5858 in the Chrome
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browser. You may have to click pause if starting with `--debug-brk` to force
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the UI to update.
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## Use `node-inspector` for Debugging
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### 1. Install the [node-gyp required tools][node-gyp-required-tools]
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### 2. Install [`node-inspector`][node-inspector]
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```bash
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$ npm install node-inspector
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```
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### 3. Install [`node-pre-gyp`][node-pre-gyp]
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```bash
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$ npm install node-pre-gyp
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```
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### 4. Recompile the `node-inspector` `v8` modules for Electron
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**Note:** Update the target argument to be your Electron version number
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```bash
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$ node_modules/.bin/node-pre-gyp --target=1.2.5 --runtime=electron --fallback-to-build --directory node_modules/v8-debug/ --dist-url=https://atom.io/download/atom-shell reinstall
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$ node_modules/.bin/node-pre-gyp --target=1.2.5 --runtime=electron --fallback-to-build --directory node_modules/v8-profiler/ --dist-url=https://atom.io/download/atom-shell reinstall
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```
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See also [How to install native modules][how-to-install-native-modules].
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### 5. Enable debug mode for Electron
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You can either start Electron with a debug flag like:
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```bash
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$ electron --debug=5858 your/app
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```
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or, to pause your script on the first line:
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```bash
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$ electron --debug-brk=5858 your/app
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```
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### 6. Start the [`node-inspector`][node-inspector] server using Electron
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```bash
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$ ELECTRON_RUN_AS_NODE=true path/to/electron.exe node_modules/node-inspector/bin/inspector.js
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```
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### 7. Load the debugger UI
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Open http://127.0.0.1:8080/debug?ws=127.0.0.1:8080&port=5858 in the Chrome
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browser. You may have to click pause if starting with `--debug-brk` to see the
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entry line.
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[electron-inspector]: https://github.com/enlight/electron-inspector
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[electron-rebuild]: https://github.com/electron/electron-rebuild
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[node-inspector]: https://github.com/node-inspector/node-inspector
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[node-pre-gyp]: https://github.com/mapbox/node-pre-gyp
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[node-gyp-required-tools]: https://github.com/nodejs/node-gyp#installation
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[how-to-install-native-modules]: using-native-node-modules.md#how-to-install-native-modules
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34
docs/tutorial/debugging-main-process-vscode.md
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docs/tutorial/debugging-main-process-vscode.md
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# Debugging the Main Process in VSCode
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### 1. Open an Electron project in VSCode.
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```bash
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$ git clone git@github.com:electron/electron-quick-start.git
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$ code electron-quick-start
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```
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### 2. Add a file `.vscode/launch.json` with the following configuration:
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```json
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{
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"version": "0.2.0",
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"configurations": [
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{
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"name": "Debug Main Process",
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"type": "node",
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"request": "launch",
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"cwd": "${workspaceRoot}",
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"runtimeExecutable": "${workspaceRoot}/node_modules/.bin/electron",
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"program": "${workspaceRoot}/main.js"
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}
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]
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}
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```
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**Note:** For Windows, use `"${workspaceRoot}/node_modules/.bin/electron.cmd"` for `runtimeExecutable`.
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### 3. Debugging
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Set some breakpoints in `main.js`, and start debugging in the [Debug View](https://code.visualstudio.com/docs/editor/debugging). You should be able to hit the breakpoints.
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Here is a pre-configured project that you can download and directly debug in VSCode: https://github.com/octref/vscode-electron-debug/tree/master/electron-quick-start
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@ -1,115 +1,29 @@
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# Debugging the Main Process
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The browser window DevTools can only debug the renderer process scripts (i.e.
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the web pages). In order to provide a way to debug the scripts from the main
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process, Electron has provided the `--debug` and `--debug-brk` switches.
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The DevTools in an Electron browser window can only debug JavaScript that's
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executed in that window (i.e. the web pages). To debug JavaScript that's
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executed in the main process you will need to use an external debugger and
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launch Electron with the `--debug` or `--debug-brk` switch.
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## Command Line Switches
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Use the following command line switches to debug Electron's main process:
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Use one of the following command line switches to enable debugging of the main
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process:
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### `--debug=[port]`
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When this switch is used Electron will listen for V8 debugger protocol
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messages on the `port`. The default `port` is `5858`.
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Electron will listen for V8 debugger protocol messages on the specified `port`,
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an external debugger will need to connect on this port. The default `port` is
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`5858`.
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### `--debug-brk=[port]`
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Like `--debug` but pauses the script on the first line.
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Like `--debug` but pauses execution on the first line of JavaScript.
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## Use VSCode for Debugging
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## External Debuggers
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### 1. Open an Electron project in VSCode.
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You will need to use a debugger that supports the V8 debugger protocol,
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the following guides should help you to get started:
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```bash
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$ git clone git@github.com:electron/electron-quick-start.git
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$ code electron-quick-start
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```
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### 2. Add a file `.vscode/launch.json` with the following configuration:
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```json
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{
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"version": "0.2.0",
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"configurations": [
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{
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"name": "Debug Main Process",
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"type": "node",
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"request": "launch",
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"cwd": "${workspaceRoot}",
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"runtimeExecutable": "${workspaceRoot}/node_modules/.bin/electron",
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"program": "${workspaceRoot}/main.js"
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}
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]
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}
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```
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**Note:** For Windows, use `"${workspaceRoot}/node_modules/.bin/electron.cmd"` for `runtimeExecutable`.
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### 3. Debugging
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Set some breakpoints in `main.js`, and start debugging in the [Debug View](https://code.visualstudio.com/docs/editor/debugging). You should be able to hit the breakpoints.
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Here is a pre-configured project that you can download and directly debug in VSCode: https://github.com/octref/vscode-electron-debug/tree/master/electron-quick-start
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## Use node-inspector for Debugging
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**Note:** Electron doesn't currently work very well with node-inspector, and the
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main process will crash if you inspect the `process` object under
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node-inspector's console.
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### 1. Install the [node-gyp required tools][node-gyp-required-tools]
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### 2. Install [node-inspector][node-inspector]
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```bash
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$ npm install node-inspector
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```
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### 3. Install [node-pre-gyp][node-pre-gyp]
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```bash
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$ npm install node-pre-gyp
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```
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### 4. Recompile the `node-inspector` `v8` modules for Electron
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**Note:** Update the target argument to be your Electron version number
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```bash
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$ node_modules/.bin/node-pre-gyp --target=1.2.5 --runtime=electron --fallback-to-build --directory node_modules/v8-debug/ --dist-url=https://atom.io/download/atom-shell reinstall
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$ node_modules/.bin/node-pre-gyp --target=1.2.5 --runtime=electron --fallback-to-build --directory node_modules/v8-profiler/ --dist-url=https://atom.io/download/atom-shell reinstall
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```
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See also [How to install native modules][how-to-install-native-modules].
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### 5. Enable debug mode for Electron
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You can either start Electron with a debug flag like:
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```bash
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$ electron --debug=5858 your/app
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```
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or, to pause your script on the first line:
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```bash
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$ electron --debug-brk=5858 your/app
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```
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### 6. Start the [node-inspector][node-inspector] server using Electron
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```bash
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$ ELECTRON_RUN_AS_NODE=true path/to/electron.exe node_modules/node-inspector/bin/inspector.js
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```
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### 7. Load the debugger UI
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Open http://127.0.0.1:8080/debug?ws=127.0.0.1:8080&port=5858 in the Chrome
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browser. You may have to click pause if starting with `debug-brk` to see the
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entry line.
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[node-inspector]: https://github.com/node-inspector/node-inspector
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[node-pre-gyp]: https://github.com/mapbox/node-pre-gyp
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[node-gyp-required-tools]: https://github.com/nodejs/node-gyp#installation
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[how-to-install-native-modules]: using-native-node-modules.md#how-to-install-native-modules
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- [Debugging the Main Process in VSCode](debugging-main-process-vscode.md)
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- [Debugging the Main Process in node-inspector](debugging-main-process-node-inspector.md)
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