• Electron version: 2.0.0-beta.1
• Operating system: macOS

Expected behavior

Preload script should execute once

Actual behavior

Preload script (and in fact node_bootstrap.js) is executed twice in the same process but in a different context.

How to reproduce

Struggling to isolate this from the application that is experiencing it but I have narrowed it down to this being kind of expected behavior but with a newly introduced bug in 2.0.x. Basically when you call loadURL a renderer process is initially launched pointing at about:blank. In this process renderer/init.js is called and then the window navigates to the URL you requested.

For an as yet unknown reason in 2.0.x the --preload argument is present on the renderer process when the about:blank page is loaded causing user code to execute twice in the same process. This is only a problem because native modules can only be loaded once in a given process.

The fix for this would be to revert to original behavior where the --preload (amongst others) arguments are not sent to the renderer until the users page is loaded. (Don't send them for about:blank).

I'm currently working on a minimal sample