[Storybook] Fix Storybook compilation warnings (#701)

* separate type import/exports

* update prettier to v2.0

* add explicit type import/exports

package.json

@@ -32,7 +32,7 @@
     "husky": "^4.2.3",
     "lerna": "^3.20.2",
     "lint-staged": "^10.1.0",
-    "prettier": "^1.19.1"
+    "prettier": "^2.0.5"
   },
   "husky": {
     "hooks": {

packages/core/src/components/Sequence/index.ts

@@ -14,4 +14,5 @@
  * limitations under the License.
  */
 
-export { default, StepType } from './Sequence';
+export { default } from './Sequence';
+export type { StepType } from './Sequence';

packages/core/src/index.ts

@@ -16,7 +16,8 @@
 
 export * from './api';
 export { default as Page } from './layout/Page';
-export { gradients, pageTheme, PageTheme } from './layout/Page';
+export { gradients, pageTheme } from './layout/Page';
+export type { PageTheme } from './layout/Page';
 export { default as Content } from './layout/Content/Content';
 export { default as ContentHeader } from './layout/ContentHeader/ContentHeader';
 export { default as Header } from './layout/Header/Header';

packages/core/src/layout/BottomLink/index.ts

@@ -14,4 +14,5 @@
  * limitations under the License.
  */
 
-export { default, Props } from './BottomLink';
+export { default } from './BottomLink';
+export type { Props } from './BottomLink';

packages/core/src/layout/Page/index.ts

@@ -15,4 +15,5 @@
  */
 
 export { default } from './Page';
-export { gradients, pageTheme, PageTheme } from './PageThemeProvider';
+export { gradients, pageTheme } from './PageThemeProvider';
+export type { PageTheme } from './PageThemeProvider';

yarn.lock

@@ -16634,11 +16634,16 @@ prepend-http@^1.0.0, prepend-http@^1.0.1:
   resolved "https://registry.npmjs.org/prepend-http/-/prepend-http-1.0.4.tgz#d4f4562b0ce3696e41ac52d0e002e57a635dc6dc"
   integrity sha1-1PRWKwzjaW5BrFLQ4ALlemNdxtw=
 
-prettier@^1.16.4, prettier@^1.18.2, prettier@^1.19.1:
+prettier@^1.16.4, prettier@^1.18.2:
   version "1.19.1"
   resolved "https://registry.npmjs.org/prettier/-/prettier-1.19.1.tgz#f7d7f5ff8a9cd872a7be4ca142095956a60797cb"
   integrity sha512-s7PoyDv/II1ObgQunCbB9PdLmUcBZcnWOcxDh7O0N/UwDEsHyqkW+Qh28jW+mVuCdx7gLB0BotYI1Y6uI9iyew==
 
+prettier@^2.0.5:
+  version "2.0.5"
+  resolved "https://registry.npmjs.org/prettier/-/prettier-2.0.5.tgz#d6d56282455243f2f92cc1716692c08aa31522d4"
+  integrity sha512-7PtVymN48hGcO4fGjybyBSIWDsLU4H4XlvOHfq91pz9kkGlonzwTfYkaIEwiRg/dAJF9YlbsduBAgtYLi+8cFg==
+
 pretty-bytes@5.3.0, pretty-bytes@^5.1.0:
   version "5.3.0"
   resolved "https://registry.npmjs.org/pretty-bytes/-/pretty-bytes-5.3.0.tgz#f2849e27db79fb4d6cfe24764fc4134f165989f2"