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toJSX does not have a default for `options.file`

See original GitHub issue

Subject of the issue

After the most recent release, Storybook will not build and returns this error:

WARN ./src/components/Box/Box.stories.mdx
WARN Module build failed (from ./node_modules/@mdx-js/loader/index.js):
WARN TypeError: Cannot read property 'path' of undefined
WARN     at Function.toJSX (project/node_modules/@storybook/addon-docs/node_modules/@mdx-js/mdx/mdx-hast-to-jsx.js:124:30)
WARN     at extractExports (project/node_modules/@storybook/addon-docs/dist/mdx/mdx-compiler-plugin.js:396:29)
WARN     at Compiler (project/node_modules/@storybook/addon-docs/dist/mdx/mdx-compiler-plugin.js:454:14)
WARN     at Function.stringify (project/node_modules/unified/index.js:354:12)
WARN     at pipelineStringify (project/node_modules/unified/index.js:41:18)
WARN     at wrapped (project/node_modules/trough/wrap.js:25:19)
WARN     at next (project/node_modules/trough/index.js:57:24)
WARN     at done (project/node_modules/trough/wrap.js:55:16)
WARN     at done (project/node_modules/unified/index.js:35:7)
WARN     at done (project/node_modules/unified/index.js:314:11)
WARN     at next (project/node_modules/trough/index.js:59:14)
WARN     at done (project/node_modules/trough/wrap.js:55:16)
WARN     at then (project/node_modules/trough/wrap.js:62:5)
WARN     at wrapped (project/node_modules/trough/wrap.js:45:9)
WARN     at next (project/node_modules/trough/index.js:57:24)
WARN     at done (project/node_modules/trough/wrap.js:55:16)
WARN  @ ./src/components/Box sync nonrecursive ^\.\/(?:(?:Box\.stories\.mdx)$)$ ./Box.stories.mdx
WARN  @ ./.storybook/generated-entry.js
WARN  @ multi ./node_modules/@storybook/core/dist/server/common/polyfills.js ./node_modules/@storybook/core/dist/server/preview/globals.js ./node_modules/@storybook/addon-docs/dist/frameworks/common/config.js ./node_modules/@storybook/addon-docs/dist/frameworks/react/config.js ./.storybook/preview.js ./.storybook/generated-entry.js

This might be Storybook’s issue to solve, but it also seems as if there isn’t a defaulting occurring for options.file inside of toJSX() here, which was introduced in #1126.