Warning "export 'xxx' was not found in '...'"

[kristw]

Describe the bug

Warning message about missing types. The types code are strip when transpile to javascript, but the exports are not.

WARNING in ./node_modules/@superset-ui/core/esm/index.js 1:178-260
"export 'RegistryConfig' was not found in './models/Registry'
 @ ./node_modules/@superset-ui/color/esm/CategoricalColorScale.js
 @ ./node_modules/@superset-ui/color/esm/CategoricalColorNamespace.js
 @ ./node_modules/@superset-ui/color/esm/index.js
 @ ./src/setup/setupColors.js
 @ ./src/preamble.js
 @ multi (webpack)-dev-server/client?http://localhost:9000 (webpack)/hot/dev-server.js babel-polyfill ./src/preamble.js

WARNING in ./node_modules/@superset-ui/core/esm/index.js 1:260-368
"export 'RegistryWithDefaultKeyConfig' was not found in './models/RegistryWithDefaultKey'
 @ ./node_modules/@superset-ui/color/esm/CategoricalColorScale.js
 @ ./node_modules/@superset-ui/color/esm/CategoricalColorNamespace.js
 @ ./node_modules/@superset-ui/color/esm/index.js
 @ ./src/setup/setupColors.js
 @ ./src/preamble.js
 @ multi (webpack)-dev-server/client?http://localhost:9000 (webpack)/hot/dev-server.js babel-polyfill ./src/preamble.js

WARNING in ./node_modules/@superset-ui/color/esm/index.js 1:459-542
"export 'SequentialSchemeConfig' was not found in './SequentialScheme'
 @ ./src/setup/setupColors.js
 @ ./src/preamble.js
 @ multi (webpack)-dev-server/client?http://localhost:9000 (webpack)/hot/dev-server.js babel-polyfill ./src/preamble.js

WARNING in ./node_modules/@superset-ui/connection/esm/index.js 1:42-122
"export 'SupersetClientInterface' was not found in './SupersetClient'
 @ ./src/setup/setupClient.js
 @ ./src/preamble.js
 @ multi (webpack)-dev-server/client?http://localhost:9000 (webpack)/hot/dev-server.js babel-polyfill ./src/preamble.js

See more details of similar issues.
webpack/webpack#7378

To Reproduce
Use the @superset-ui packages (that was written in TypeScript) in another app.

Expected behavior
Build successfully without warning.

Screenshots
If applicable, add screenshots to help explain your problem.

Environment (please complete the following information):

• superset-ui version: 0.9.3
• Node version: 10.10
• npm version: 6.4.1

[kristw]

One possible solution is to suppress error via webpack plugin on Superset side, but have to define list of what to suppress. Still not ideal.
https://github.com/igorkamyshev/ignore-not-found-export-plugin

[kristw]

Talked to Miles Johnson and got some advice.

You have a few options
1 - Don't re-export types.
2 - Move all types to a single file and use export * from './types';
3 - Create a special index file for esm that only exports values.
Like so: https://github.com/milesj/interweave/blob/master/packages/core/module.js