feat: support legacy config

[Djiit]

Fixes #5

[Dunqing]

Thank you for improving the documentation!!

[Dunqing]

I think we should support passing ' plugins: [oxlint]` when the eslint version < 9.0. But I haven't looked into what needs to be done.

[Djiit]

I agree with you. In the meantime, doing like this works well and is not too hacky to setup, imho.

[Djiit]

Using conditional exports, we should be able to do something. See: sindresorhus/eslint-plugin-unicorn#1886

[Djiit]

@Dunqing alright, if figured it out. The "presets" in eslint legacy config are called "configs" in the docs... See: https://eslint.org/docs/latest/extend/plugins#configs-in-plugins

Now, the plugin can be used with one line of config in legacy configs :)

[Djiit]

I noticed the repo don't have any formatter configured -- looks like my formatter (prettier) did some changes. Can be reverted on demand.

[Dunqing]

@Dunqing alright, if figured it out. The "presets" in eslint legacy config are called "configs" in the docs... See: https://eslint.org/docs/latest/extend/plugins#configs-in-plugins

Now, the plugin can be used with one line of config in legacy configs :)

Thanks! That's great!

[Dunqing]

Thanks for working on this!