`plugin` option from option file not used.

I'm using a configuration file to store my TypeDoc settings. This configuration file contains the list of plugins to use, but they are not called at all. I don't want to rely on NPM auto-discovery.

[x] I have checked issues with bug label and found no duplicates

This issue may be somehow related to #875.

Expected Behavior

Typedoc should use plugin array provided in the configuration file, and eventually merge it with the one provided by CLI arguments

Actual Behavior

Typedoc does not use the plugin option from the config file, and uses only NPM auto-discovery or the --plugin CLI argument

Steps to reproduce the bug

Install any typedoc plugin. From the installed plugin, remove the keyword typedocplugin from the keywords of the installed package.json, thus disabling npm auto-discovery.

Create a typedoc.json file

{
    "mode": "file",
    "out": "docs",
    "plugin": ["my-typedoc-plugin"]
}

Run typedoc:

npx typedoc --options typedoc.json

Environment

Typedoc version: 0.14.2
Node.js version: 11.3.0
OS: Win10 x64

What I've tried

As far as I've seen and experimented, the problem is here: https://github.com/TypeStrong/typedoc/blob/9a76bec7cbc9fc7be7e00dd22f58f715bb4cebed/src/lib/application.ts#L124-L125

If I replace those lines with the following, the plugin is called correctly, but I didn't checked for side effects:

const optionsRead = this.options.read(this.options.getRawValues(), OptionsReadMode.Fetch);
this.plugins.load(); 
return optionsRead;

So is it intentional that options are parsed after plugins load ?

Edit : after further checks, I saw that options declared by the plugin are not provided to it if I apply the solution mentioned above. So, maybe options should be parsed once before plugins load, stored somewhere as raw options, then use those raw options when a plugin declares them.

TypeStrong / typedoc