argsType should be optionnal for MetaComponent.

[Exalyon]

Describe the bug
The prop argsType seem mandatory for the Meta component. This is a warning from the MDX plugin in a Jetbrains product.

To Reproduce
Steps to reproduce the behavior:

1. Create a MDX file
2. Insert a Meta component

Expected behavior
The warning should not occur

System
yarn list v1.22.10
├─ @storybook/addon-actions@6.1.6
├─ @storybook/addon-backgrounds@6.1.6
├─ @storybook/addon-docs@6.1.6
├─ @storybook/addon-knobs@6.1.6
├─ @storybook/addon-links@6.1.6
├─ @storybook/addons@6.1.6
├─ @storybook/api@6.1.6
├─ @storybook/channel-postmessage@6.1.6
├─ @storybook/channels@6.1.6
├─ @storybook/client-api@6.1.6
├─ @storybook/client-logger@6.1.6
├─ @storybook/components@6.1.6
├─ @storybook/core-events@6.1.6
├─ @storybook/core@6.1.6
├─ @storybook/csf@0.0.1
├─ @storybook/node-logger@6.1.6
├─ @storybook/postinstall@6.1.6
├─ @storybook/preset-create-react-app@3.1.5
├─ @storybook/react@6.1.6
├─ @storybook/router@6.1.6
├─ @storybook/semver@7.3.2
├─ @storybook/source-loader@6.1.6
├─ @storybook/theming@6.1.6
├─ @storybook/ui@6.1.6
├─ storybook-addon-intl@2.4.1
├─ storybook-addon-paddings@3.0.0
└─ storybook-react-router@1.0.8

Additional context
I think it comes from the MetaProps interface in the Meta.d.ts. There it misses the ? before the : on the argsType property to make it optionnal.

[shilman]

Whoopee!! I just released https://github.com/storybookjs/storybook/releases/tag/v6.2.0-alpha.1 containing PR #13352 that references this issue. Upgrade today to the @next NPM tag to try it out!

npx sb upgrade --prerelease

Closing this issue. Please re-open if you think there's still more to do.

[shilman]

Olé!! I just released https://github.com/storybookjs/storybook/releases/tag/v6.1.10 containing PR #13352 that references this issue. Upgrade today to the @latest NPM tag to try it out!

npx sb upgrade