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node_modules/tailwindcss/scripts/compat.js

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+let fs = require('fs')
+let path = require('path')
+let merge = require('lodash/merge')
+let fastGlob = require('fast-glob')
+
+let postcss7 = fastGlob.sync(['./**/*.postcss7.*']).filter((file) => !file.startsWith('lib/'))
+let postcss8 = fastGlob.sync(['./**/*.postcss8.*']).filter((file) => !file.startsWith('lib/'))
+
+if (process.argv.includes('--prepare')) {
+  if (postcss8.length > 0) {
+    console.error('\n\n[ABORT] Already in PostCSS 7 compatibility mode!\n\n')
+    process.exit(1)
+  }
+
+  let mainPackageJson = require('../package.json')
+  let compatPackageJson = require('../package.postcss7.json')
+
+  // Use postcss7 files
+  for (let file of postcss7) {
+    let bareFile = file.replace('.postcss7', '')
+    let postcss8File = file.replace('.postcss7', '.postcss8')
+
+    // Backup
+    copy(fromRootPath(bareFile), fromRootPath(postcss8File))
+
+    // Swap
+    copy(fromRootPath(file), fromRootPath(bareFile))
+  }
+
+  // Deep merge package.json contents
+  let packageJson = merge({}, mainPackageJson, compatPackageJson)
+
+  // Remove peerDependencies
+  delete packageJson.peerDependencies
+
+  // Cleanup devDependencies
+  for (let key in packageJson.devDependencies) {
+    if (key.includes('postcss')) delete packageJson.devDependencies[key]
+  }
+
+  // Use new name
+  packageJson.name = '@tailwindcss/postcss7-compat'
+
+  // Make sure you can publish
+  packageJson.publishConfig = { access: 'public' }
+
+  // Write package.json with the new contents
+  fs.writeFileSync(fromRootPath('package.json'), JSON.stringify(packageJson, null, 2), 'utf8')
+
+  // Print some useful information to make publishing easy
+  console.log()
+  console.log('You can safely publish `tailwindcss` in PostCSS 7 compatibility mode:\n')
+  console.log()
+} else if (process.argv.includes('--restore')) {
+  if (postcss8.length === 0) {
+    console.error('\n\n[ABORT] Already in latest PostCSS mode!\n\n')
+    process.exit(1)
+  }
+
+  // Use postcss8 files
+  for (let file of postcss8) {
+    let bareFile = file.replace('.postcss8', '')
+
+    // Restore
+    copy(fromRootPath(file), fromRootPath(bareFile))
+
+    // Remove
+    fs.unlinkSync(fromRootPath(file))
+  }
+
+  // Done
+  console.log()
+  console.log('Restored from PostCSS 7 mode to latest PostCSS mode!')
+  console.log()
+}
+
+// ---
+
+function fromRootPath(...paths) {
+  return path.resolve(process.cwd(), ...paths)
+}
+
+function copy(fromPath, toPath) {
+  fs.copyFileSync(fromPath, toPath)
+}