Prettier currently replaces all non-breaking spaces with standard space characters.

This makes sense in JavaScript or other source file formats where they may have been entered inadvertently — but when they appear in Markdown, they are most likely intentional and should not be discarded.

(In prose writing, non-breaking spaces are often essential to keep numbers and units together, or ensure multi-word product names aren't torn apart.)

Prettier 1.8.2
Playground link

--parser markdown

Input:

keep•these•words•together

(the • character is used above to represent non-breaking spaces)

Output:

keep these words together

Expected behavior:

keep•these•words•together

To support this use case, the markdown parser defaults should be adjusted to preserve non-breaking spaces, or a new configuration option added that allows users to enable this behavior as required.