Typst one-page cheat sheet: check it still fits after edits by rendering PNGs and counting pages

When iteratively adding content to a dense one-page Typst cheat sheet (2 columns, ~7pt), verify fit after every edit with typst compile --root . --ppi 90 sheet.typ out/cs-{p}.png and count the PNGs: one file means it still fits on one page; {p} expands to page numbers. Clear the output dir first or stale cs-2.png files mislead you. Viewing the PNG also catches run-on paragraphs: in Typst a single newline does not break a line, so end lines with \ (backslash) when a block should read as separate lines. Python str.replace with an assert count==1 is a safe way to patch exact sections of a .typ file in place.