fix: export superset theme props

[nytai]

🏆 Enhancements
Export SupersetThemeProps interface so that it can be extended when using additional props in styled components.

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/superset/superset-ui/bph7gpl8y
✅ Preview: https://superset-ui-git-fork-preset-io-tai-export-theme-props.superset.now.sh

[codecov]

Codecov Report

Merging #391 into master will decrease coverage by 4.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #391      +/-   ##
==========================================
- Coverage   26.30%   22.25%   -4.06%     
==========================================
  Files         192      261      +69     
  Lines        5291     6474    +1183     
  Branches      474      587     +113     
==========================================
+ Hits         1392     1441      +49     
- Misses       3864     4996    +1132     
- Partials       35       37       +2     

Impacted Files	Coverage Δ
packages/superset-ui-style/src/index.ts	100.00% <ø> (ø)
packages/superset-ui-query/src/buildQueryObject.ts	100.00% <0.00%> (ø)
.../preset-chart-xy/src/utils/createTickComponent.tsx	0.00% <0.00%> (ø)
plugins/preset-chart-xy/src/Line/createMetadata.ts	0.00% <0.00%> (ø)
plugins/legacy-preset-chart-nvd3/src/Bar/index.js	0.00% <0.00%> (ø)
...-chart-xy/src/ScatterPlot/legacy/transformProps.ts	0.00% <0.00%> (ø)
plugins/preset-chart-xy/src/BoxPlot/index.ts	0.00% <0.00%> (ø)
...rt-xy/src/components/legend/DefaultLegendGroup.tsx	0.00% <0.00%> (ø)
...preset-chart-xy/src/utils/createMarginSelector.tsx	0.00% <0.00%> (ø)
plugins/legacy-preset-chart-nvd3/src/preset.js	0.00% <0.00%> (ø)
... and 61 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a95301f...80b62cb. Read the comment docs.

[kristw]

Please also add unit test to ensure 100% coverage

[kristw]

Not sure if this problem still persists with exporting types. We can try this first if you'd like, but if you run into issue later in the consuming app about "reexporting type", please come back here and move the definition of the interface to a new file such as types.ts

types.ts

export interface SupersetThemeProps {
 theme: typeof defaultTheme;
}

then export all from the type file like this in the index.ts

export default styled as CreateStyled<typeof defaultTheme>;
export const supersetTheme = defaultTheme;
export * from './types'