pub fn css_in_js_virtual_stylesheet(source: &str) -> Option<String>Expand description
Build a virtual stylesheet from the CSS-in-JS tagged templates in a JS/TS
source. Each template body is placed at its real line in the source via
blank-line padding, so CSS metric line numbers from
crate::compute_css_analytics map straight back onto the source. Every
${...} interpolation is masked to a CSS-valid placeholder (newline count
preserved so lines after a multi-line interpolation stay aligned). Returns
None when the source has no CSS-in-JS tagged template, so callers skip the
file entirely (no files_analyzed inflation).