Update cheatsheets

postcss

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# postcss
+
+> Transform styles with JS plugins.
+> More information: <https://postcss.org>.
+
+- Parse and transform a CSS file:
+
+`postcss {{path/to/file}}`
+
+- Parse and transform a CSS file and output to a specific file:
+
+`postcss {{path/to/file}} --output {{path/to/file}}`
+
+- Parse and transform a CSS file and output to a specific directory:
+
+`postcss {{path/to/file}} --dir {{path/to/directory}}`
+
+- Parse and transform a CSS file in-place:
+
+`postcss {{path/to/file}} --replace`
+
+- Specify a custom PostCSS parser:
+
+`postcss {{path/to/file}} --parser {{parser}}`
+
+- Specify a custom PostCSS syntax:
+
+`postcss {{path/to/file}} --syntax {{syntax}}`
+
+- Watch for changes to a CSS file:
+
+`postcss {{path/to/file}} --watch`
+
+- Display help:
+
+`postcss --help`