fix(docz-core): typescript doesn't work with several exports (#771)

* fix(babel-plugin-export-metadata): export default doesn't work

* fix(babel-plugin-export-metadata): write tests for new version

* fix(docz-core): docgen doesn't parse several exports in one file in TS

* fix(docz): <Props /> doesn't check by displayName

* fix(docz-core): ts doesn't work with several exports

core/docz-core/src/utils/docgen/typescript.ts

@@ -169,21 +169,19 @@ const parseFiles = (files: string[], config: Config, tsconfig: string) => {
   loadFiles(files)
   const parser = reactDocgenTs.withCustomConfig(tsconfig, opts)
   const compilerOptions = _.get('options', getTSConfigFile(tsconfig))
-  const props = parser.parseWithProgramProvider(files, () => {
+
+  const programProvider = () => {
     if (languageService) return languageService.getProgram()!
     const servicesHost = createServiceHost(compilerOptions, filesMap)
     const documentRegistry = ts.createDocumentRegistry()
     languageService = ts.createLanguageService(servicesHost, documentRegistry)
     return languageService.getProgram()!
-  })
-
-  const parseFilepathProp = (prop: any, idx: number) =>
-    prop && {
-      key: _.get(idx, files),
-      value: [prop],
-    }
+  }
 
-  return props.map(parseFilepathProp).filter(Boolean)
+  return files.map(filepath => ({
+    key: filepath,
+    value: parser.parseWithProgramProvider(filepath, programProvider),
+  }))
 }
 
 export const tsParser = (

core/docz/src/components/AsyncRoute.tsx

@@ -1,7 +1,7 @@
 import * as React from 'react'
 import { SFC } from 'react'
 import { get } from 'lodash/fp'
-import {lazy} from '@loadable/component'
+import { lazy } from '@loadable/component'
 
 import { Entry } from '../state'
 import { useComponents, ComponentsMap } from '../hooks/useComponents'