refactor(content-docs): clean up sidebars logic; validate generator returns (#6596)

* refactor(content-docs): clean up sidebars logic; validate generator returns

* remove another TODO

* fix types

* refactors

* refactor...
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Joshua Chen 2022-02-04 09:46:25 +08:00 committed by GitHub
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# Sidebars
This part is very complicated and hard to navigate. Sidebars are loaded through the following steps:
1. **Loading**. The sidebars file is read. Returns `SidebarsConfig`.
2. **Normalization**. The shorthands are expanded. This step is very lenient about the sidebars' shapes. Returns `NormalizedSidebars`.
3. **Validation**. The normalized sidebars are validated. This step happens after normalization, because the normalized sidebars are easier to validate, and allows us to repeatedly validate & generate in the future.
4. **Generation**. This step is done through the "processor" (naming is hard). The `autogenerated` items are unwrapped. In the future, steps 3 and 4 may be repeatedly done until all autogenerated items are unwrapped. Returns `ProcessedSidebars`.
5. **Post-processing**. Defaults are applied (collapsed states), category links are resolved, empty categories are flattened. Returns `Sidebars`.