Injects CSS and JS files into closed source electron applications.
Injected JS will be evaluated; for injected CSS, a script will be injected that adds the CSS to the main stylesheet.
This script will launch the target app (with arguments if provided) then attempt injection into every discovered window/webview over a period of several seconds.
To install dependencies
npm install
node index.js --css custom.css --js custom.js path/to/electron/app args...
Multiple css and js files may be specified, just repeat the arguments, e.g.
node index.js --css custom1.css --css custom2.css path/to/electron/app args...
You can also supply a specification of how to patch javascript files loaded by the app. Note that this seems only to work for relatively small scripts.
Create a JS patch file with contents:
({
shouldPatch: scriptUrl => /* return true iff script should be patched */,
patch: scriptSource => /* return patched script contents as a string */
})
The arguments scriptUrl and scriptSource are strings.
You can specify multiple patches. They will be tried sequentially for each script: the first patch that returns true from shouldPatch will be used to patch a particular script.
Usage:
node index.js --jsPatch patch.js path/to/electron/app args...
Patches can of course be combined with ordinary CSS and JS injection.