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node_modules/purgecss/bin/purgecss.js

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+#!/usr/bin/env node
+const program = require("commander");
+const fs = require("fs");
+const {
+  default: PurgeCSS,
+  defaultOptions,
+  setOptions,
+  standardizeSafelist,
+} = require("../lib/purgecss");
+
+async function writeCSSToFile(filePath, css) {
+  try {
+    await fs.promises.writeFile(filePath, css);
+  } catch (err) {
+    console.error(err.message);
+  }
+}
+
+program
+  .usage("--css <css...> --content <content...> [options]")
+  .option("-con, --content <files...>", "glob of content files")
+  .option("-css, --css <files...>", "glob of css files")
+  .option("-c, --config <path>", "path to the configuration file")
+  .option(
+    "-o, --output <path>",
+    "file path directory to write purged css files to"
+  )
+  .option("-font, --font-face", "option to remove unused font-faces")
+  .option("-keyframes, --keyframes", "option to remove unused keyframes")
+  .option("-rejected, --rejected", "option to output rejected selectors")
+  .option(
+    "-s, --safelist <list...>",
+    "list of classes that should not be removed"
+  )
+  .option(
+    "-b, --blocklist <list...>",
+    "list of selectors that should be removed"
+  )
+  .option(
+    "-k, --skippedContentGlobs <list...>",
+    "list of glob patterns for folders/files that should not be scanned"
+  );
+
+program.parse(process.argv);
+
+const run = async () => {
+  // config file is not specified or the content and css are not,
+  // PurgeCSS will not run
+  if (!program.config && !(program.content && program.css)) {
+    program.help();
+  }
+
+  // if the config file is present, use it
+  // other options specified will override
+  let options = defaultOptions;
+  if (program.config) {
+    options = await setOptions(program.config);
+  }
+  if (program.content) options.content = program.content;
+  if (program.css) options.css = program.css;
+  if (program.fontFace) options.fontFace = program.fontFace;
+  if (program.keyframes) options.keyframes = program.keyframes;
+  if (program.rejected) options.rejected = program.rejected;
+  if (program.variables) options.variables = program.variables;
+  if (program.safelist) options.safelist = standardizeSafelist(program.safelist);
+  if (program.blocklist) options.blocklist = program.blocklist;
+  if (program.skippedContentGlobs) options.skippedContentGlobs = program.skippedContentGlobs;
+
+  const purged = await new PurgeCSS().purge(options);
+  const output = options.output || program.output;
+  // output results in specified directory
+  if (output) {
+    if (purged.length === 1 && output.endsWith(".css")) {
+      await writeCSSToFile(output, purged[0].css);
+      return;
+    }
+
+    for (const purgedResult of purged) {
+      const fileName = purgedResult.file.split("/").pop();
+      await writeCSSToFile(`${output}/${fileName}`, purgedResult.css);
+    }
+  } else {
+    console.log(JSON.stringify(purged));
+  }
+};
+
+try {
+  run();
+} catch (error) {
+  console.error(error.message);
+  process.exit(1);
+}