scratch-desktop

Scratch 3.0 as a standalone desktop application

Developer Instructions

Prepare `scratch-gui`

This step is temporary: eventually, the scratch-desktop branch of the Scratch GUI repository will be merged with that repository's main development line. For now, though, there's a separate branch:

Clone the scratch-gui repository if you haven't already.
Switch to the scratch-desktop branch with git checkout scratch-desktop
Build with BUILD_MODE=dist:
- macOS, WSL, or Cygwin: run BUILD_MODE=dist npm run build or BUILD_MODE=dist npm run watch
- CMD: run set BUILD_MODE=dist once, then npm run build or npm run watch any number of times in the same window.
- PowerShell: run $env:BUILD_MODE = "dist" once, then npm run build or npm run watch any number of times in the same window.

Prepare media library assets

In the scratch-desktop directory, run npm run fetch. Re-run this any time you update scratch-gui or make any other changes which might affect the media libraries.

Run in development mode

npm start

Make a packaged build

npm run dist

Node that on macOS this will require installing various certificates.

Signing the NSIS installer (Windows, non-store)

This section is relevant only to members of the Scratch Team.

By default all Windows installers are unsigned. An APPX package for the Microsoft Store shouldn't be signed: it will be signed automatically as part of the store submission process. On the other hand, the non-Store NSIS installer should be signed.

To generate a signed NSIS installer:

Acquire our latest digital signing certificate and save it on your computer as a p12 file.
Set WIN_CSC_LINK to the path to your certificate file. For maximum compatibility I use forward slashes.
- CMD: set WIN_CSC_LINK=C:/Users/You/Somewhere/Certificate.p12
- PowerShell: $env:WIN_CSC_LINK = "C:/Users/You/Somewhere/Certificate.p12"
Set WIN_CSC_KEY_PASSWORD to the password string associated with your P12 file.
- CMD: set WIN_CSC_KEY_PASSWORD=superSecret
- PowerShell: $env:WIN_CSC_KEY_PASSWORD = "superSecret"
Build the NSIS installer only: building the APPX installer will fail if these environment variables are set.
- npm run dist -- -w nsis

Make a semi-packaged build

This will simulate a packaged build without actually packaging it: instead the files will be copied to a subdirectory of dist.

npm run dist:dir

Debugging

You can debug the renderer process by opening the Chromium development console. This should be the same keyboard shortcut as Chrome on your platform. This won't work on a packaged build.

You can debug the main process the same way as any Node.js process. I like to use Visual Studio Code with a configuration like this:

    "launch": {
        "version": "0.2.0",
        "configurations": [
            {
                "name": "Desktop",
                "type": "node",
                "request": "launch",
                "cwd": "${workspaceFolder:scratch-desktop}",
                "runtimeExecutable": "npm",
                "autoAttachChildProcesses": true,
                "runtimeArgs": ["start", "--"],
                "protocol": "inspector",
                "skipFiles": [
                    // it seems like skipFiles only reliably works with 1 entry :(
                    //"<node_internals>/**",
                    "${workspaceFolder:scratch-desktop}/node_modules/electron/dist/resources/*.asar/**"
                ],
                "sourceMaps": true,
                "timeout": 30000,
                "outputCapture": "std"
            }
        ]
    },

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