Fix: Fix missing FlowType enum values in prop description (styleguidi…

…st#1571)

In `ef4c109b`, the file `PropsRenderer.js` (located at
`src/client/rsg-components/Props/PropsRenderer.js`) was removed. In
`PropsRenderer.js`, the `renderExtra` method checked whether `getType`
for the argument to `renderExtra` was present:

```es6
function renderExtra(prop) {
  const type = getType(prop);
  if (!type) {
    return null;
  }
  ...
}
```

However, in `ef4c109b`, this method was replaced with `renderExtra.tsx`
and the condition was changed to:

```typescript
export default function renderExtra(prop: PropDescriptorWithFlow): React.ReactNode {
  const type = getType(prop);
  if (!prop.type || !type) {
    return null;
  }
```

Unfortunately, this extra condition has resulted in this method always
returning `null` for a Flow typed prop as `prop.type` is always `null`
as `prop.type` is never set.

This commit reverts the condition to what it was before the migration to
TypeScript.

Fix: Correct Usage of CleanWebpackPlugin (styleguidist#1565)

I was still using an option that no longer exists. Fixed to mimic the original behavior. The option `root` was removed in v2, but wasn't changed during the upgrade in styleguidist@9804259

It's deleting everything in the styleguidistDir folder which isn't the way it was before.
After this change it only deletes files in build/.

Fix: Sections with href were always open in new tab, regardless of th…

…e external option (styleguidist#1564)

Fixes styleguidist#1559

Fix: Prop types are missing for TypeScript (styleguidist#1563)

Closes styleguidist#1551

Fix: Exported TypeScript typings (styleguidist#1550)

Breaking: Drop Node.js 8 support (styleguidist#1545)

The minimum supported Node.js version is 10.

Fix: Open all sections when searching (styleguidist#1537)

When searching with the option tocmode: 'collapse' the sections do not open automatically (because they keep their state). The found section or page is therefore not visible nor clickable.

Build: Make sure compile works on windows (styleguidist#1522)

Build(deps): Bump lodash from 4.17.11 to 4.17.13 in /examples/webpack (…

…styleguidist#1518)

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.11 to 4.17.13.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.11...4.17.13)

Signed-off-by: dependabot[bot] <[email protected]>

New: Add hot module reloading for theme and styles (styleguidist#1489)

* make theme hmr loadable

* try making a theme hmr tool

* add an example for it

* add styles in the mix

* fix example

* fix typings

* fix modulenamemapper fo jest tests

* update snapshots

* Add tests for the new behavior

* prevent eslint from being mean to jest mock

* remove rsg styles type

* reorder imports

* make better tests

* make example filenames more explicit

* remove eslint exception in example

* fix webpack and add comments

* update snapshots

* add tests for make webpack config

* augment coverage over make-webpack-config

* remove useless ependency

* document styles and themes hmr

* fix typings

* remove eslintrc changes

* fix resolving of path from configDir

* update docs and example

* remove compile change

* make better style file path

* cookbook clarification

* fix typings

* fix typo in docs

Co-Authored-By: Artem Sapegin <[email protected]>

* Update case in the note docs

Co-Authored-By: Artem Sapegin <[email protected]>

* remove added chevrons in cookbook

* update examples package and lock

* remove modifications from webpack config

* clean eslint changes

* simplify themed example

* fix redme for left button

* update themed

* improve types

*  use the styleguide-loader instead

* remove all chanegs from make webpack config

* make the HMR of theme work

* optimize performance when not using  style files

* rollback unwanted changes to eslint

* update whitespace

* replace tabs with spaces

* fix es5 export of styles and themes

* update createssheet tests

* remove unwanted changes

* fix optimization

* add various comments

* add tests on styleguide-loader

* more code coverage

* replace RE by regExp in tests

Co-Authored-By: Artem Sapegin <[email protected]>

* complete the test clarification

* remove custom state documentation

* move all changes to styleguide-loader

* avoid compiling test files

* add comments regarding optimization

* fix tests and styleguide loader

* can't deal with default this way...

* resolve es6 in loader side

* ue has-sum intead of custom md5

* better case conventions for constants

* rename resolve esmodule

* fix typings

* rename es6 test file

* use destructured theme and styles

* fix test name

* fix types

* remove hmrStyles

* update comments of styleguide-loader

* add comments and test

* update comments

Co-authored-by: Artem Sapegin <[email protected]>