The styled namespace

The rules of the core under @stylistic/styled/<rule>, for stylesheets embedded in JavaScript as styled templates and parsed with postcss-styled-syntax. They live in .js and .ts files, and which of those hold a stylesheet is the project's to say, so the recommended preset leaves them out entirely: Your own syntaxes shows the entry naming the files, the syntax and the package.

Every rule of the core is here, with the same options and the same documentation, and plain CSS is read exactly as the core reads it. Some rules answer a styled template differently:

• indentation counts its levels from the line the template's expression opens on rather than from the start of the line, and a template broken over lines holds its content one level deeper — save for a first node standing on the line of the backtick itself, which hangs from neither and is asked for no indentation at all; a declaration whose value embeds an expression of the host language (${…}) is not checked, since its lines are the host's rather than the stylesheet's.
• no-empty-first-line reads the break behind the opening backtick as the end of the host's line rather than as an empty first line: an empty line is one standing between that line and the first line of the stylesheet.
• no-missing-end-of-source-newline asks for no break where the closing backtick stands on the host's line — a template not broken over lines, or one whose last line holds nothing but the backtick's indentation — and for one in front of a closing backtick ending a line of the stylesheet.
• no-eol-whitespace reads the end of a template's text as the end of a line where a break is missing in front of the closing backtick, and as no line's end where that backtick stands on the host's line: spaces in front of a backtick closing a single-line template, and the indentation of one standing on a line of its own, are the host's.