Allow mainFile to be configured as an option

[cyu]

This issue is related to issue [#66], but in my case setting __dirname: false in the webpack config doesn't work. From what I've read, the issue is because I'm using a config target of electron-main, which I want to keep.

My changes does two things:

• Don't error out if module.parent is undefined.
• Allow mainFile as an option to the reload function.
  module.parent.filename doesn't evaluate properly when using webpack.

[yan-foto]

There is already an open PR (#79) under review which addresses this issue. Moreover, I'm still not sure (see discussion in #71) why would you want to include electron-relaod in webpack?

I'm closing this PR due to reasons stated above.

[cyu]

@yan-foto Fair enough. I did see #79, but that's been open for almost a month, so I thought I'd offer a low-lift alternative.

As for the why question – I want to use Typescript and React/JSX with Electron so I'm using webpack to do that. Is there another alternative reload setup I should go with for Electron/webpack that's simpler? I've seen recommendations to use webpack-dev-server, and indeed my original setup was like that, but then I ran into an issue with what I believe was react-hot-loader and React Hooks. Also, it seems like react-hot-loader is deprecated, in favor of React Fast Refresh, but support for that seem in its infancy.

Would you blame me to look for a simpler alternative? After all, you do claim that this is the simplest way to do it.

[yan-foto]

I did see #79, but that's been open for almost a month.

3 Weeks, not stale and under active review. This PR would have undergone the same procedure.

Is there another alternative reload setup I should go with for Electron/webpack that's simpler?

Simply compiling everything and packaging it as an asar archive? Webpack, as the name implies, is optimized for the web browsers, causing issues that you are trying to solve in this PR.

Would you blame me to look for a simpler alternative?

No.

After all, you do claim that this is the simplest way to do it.

Not sure where that came from.