Resolves the application's splash screen content (as configured in
electron.splashScreenOptions) to a URL loadable from the frontend, given the frontend
document's baseHref. A relative path is resolved against the application root: the frontend
HTML lives at <appRoot>/lib/frontend/, so it is two levels up. An absolute path or an
already-absolute URL is used as-is (mirroring the main process, which passes content through
path.resolve). Returns undefined when no content is configured or the URL cannot be built.
Resolves the application's splash screen
content(as configured inelectron.splashScreenOptions) to a URL loadable from the frontend, given the frontend document'sbaseHref. A relative path is resolved against the application root: the frontend HTML lives at<appRoot>/lib/frontend/, so it is two levels up. An absolute path or an already-absolute URL is used as-is (mirroring the main process, which passescontentthroughpath.resolve). Returnsundefinedwhen no content is configured or the URL cannot be built.