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Main config in typescript throwing error with export default

See original GitHub issue

Describe the bug main.ts with typescript export default breaks

To Reproduce

rename your config if it’s in js to ts and have something like

export default {
  addons: ['@storybook/addon-docs', '@storybook/addon-knobs'],
};

Expected behavior No error produced and server starts

Screenshots

info @storybook/web-components v6.0.0-beta.35
info 
WARN Unable to close preview build!
ERR! /hello-web-components/.storybook/main.ts:1
ERR! export default {
ERR! ^^^^^^
ERR! 
ERR! SyntaxError: Unexpected token 'export'
ERR!     at compileFunction (<anonymous>)
ERR!     at Object.compileFunction (vm.js:344:18)
ERR!     at wrapSafe (internal/modules/cjs/loader.js:1106:15)
ERR!     at Module._compile (internal/modules/cjs/loader.js:1140:27)
ERR!     at Module._compile (/hello-web-components/node_modules/pirates/lib/index.js:99:24)
ERR!     at Module._extensions..js (internal/modules/cjs/loader.js:1196:10)
ERR!     at Object.newLoader [as .ts] (/hello-web-components/node_modules/pirates/lib/index.js:104:7)
ERR!     at Module.load (internal/modules/cjs/loader.js:1040:32)
ERR!     at Function.Module._load (internal/modules/cjs/loader.js:929:14)
ERR!     at Module.require (internal/modules/cjs/loader.js:1080:19)
ERR!     at require (internal/modules/cjs/helpers.js:72:18)
ERR!     at interopRequireDefault (/hello-web-components/node_modules/@storybook/core/dist/server/utils/server-require.js:66:16)
ERR!     at serverRequire (/hello-web-components/node_modules/@storybook/core/dist/server/utils/server-require.js:103:10)
ERR!     at loadCustomPresets (/hello-web-components/node_modules/@storybook/core/dist/server/common/custom-presets.js:21:47)
ERR!     at _default (/hello-web-components/node_modules/@storybook/core/dist/server/manager/manager-config.js:146:143)
ERR!     at _default (/hello-web-components/node_modules/@storybook/core/dist/server/dev-server.js:59:51)
ERR!  /hello-web-components/.storybook/main.ts:1
ERR! export default {
ERR! ^^^^^^
ERR! 
ERR! SyntaxError: Unexpected token 'export'
ERR!     at compileFunction (<anonymous>)
ERR!     at Object.compileFunction (vm.js:344:18)
ERR!     at wrapSafe (internal/modules/cjs/loader.js:1106:15)
ERR!     at Module._compile (internal/modules/cjs/loader.js:1140:27)
ERR!     at Module._compile (/hello-web-components/node_modules/pirates/lib/index.js:99:24)
ERR!     at Module._extensions..js (internal/modules/cjs/loader.js:1196:10)
ERR!     at Object.newLoader [as .ts] (/hello-web-components/node_modules/pirates/lib/index.js:104:7)
ERR!     at Module.load (internal/modules/cjs/loader.js:1040:32)
ERR!     at Function.Module._load (internal/modules/cjs/loader.js:929:14)
ERR!     at Module.require (internal/modules/cjs/loader.js:1080:19)
ERR!     at require (internal/modules/cjs/helpers.js:72:18)
ERR!     at interopRequireDefault (/hello-web-components/node_modules/@storybook/core/dist/server/utils/server-require.js:66:16)
ERR!     at serverRequire (/hello-web-components/node_modules/@storybook/core/dist/server/utils/server-require.js:103:10)
ERR!     at loadCustomPresets (/hello-web-components/node_modules/@storybook/core/dist/server/common/custom-presets.js:21:47)
ERR!     at _default (/hello-web-components/node_modules/@storybook/core/dist/server/manager/manager-config.js:146:143)
ERR!     at _default (/hello-web-components/node_modules/@storybook/core/dist/server/dev-server.js:59:51)

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