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The style is clean on mobile which is a plus. Consider cross-linking to deeper usage examples that showcase higher order use. For example, how to validate if a given path exists, and/or you have r/w access to it

i think the multi-line code blocks would be better with some background colour just like the inline ones to distinguish them from other text in the page for example: this appendFile function definition, I would like if it stood out more like the “usage in deno” bit from the page.

I like the f/I/v annotations, makes it easy to keep track of the current category on a small screen, making rapid scrolling less confusing.