* fix(previewer): improve binary mime type check
Problem: mime type for a ts/js file can either return `text/plain` or
`application/javascript` based on the contents of the file.
Previously, this meant `application/javascript` would be considered
"possibly binary". This, in conjunction with how `vim.filetype.match`
does not give a result for a filename that ends in `.ts`, would lead to
a typescript file taking the path of `check_mime_type` and eventually
`mime_hook`.
Solution: Include `application/javascript` as a non-binary file type
during mime type check.
* [docgen] Update doc/telescope.txt
skip-checks: true
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Co-authored-by: Github Actions <actions@github>
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