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spawnAsync from '@expo/spawn-async';\nimport chalk from 'chalk';\nimport { Command } from 'commander';\nimport downloadTarball from 'download-tarball';\nimport ejs from 'ejs';\nimport fs from 'fs-extra';\nimport path from 'path';\nimport prompts from 'prompts';\nimport validateNpmPackage from 'validate-npm-package-name';\n\nimport { createExampleApp } from './createExampleApp';\nimport { installDependencies } from './packageManager';\nimport { PackageManagerName, resolvePackageManager } from './resolvePackageManager';\nimport { CommandOptions, CustomPromptObject, SubstitutionData } from './types';\n\nconst packageJson = require('../package.json');\n\n// `yarn run` may change the current working dir, then we should use `INIT_CWD` env.\nconst CWD = process.env.INIT_CWD || process.cwd();\n\n// Ignore some paths. Especially `package.json` as it is rendered\n// from `$package.json` file instead of the original one.\nconst IGNORES_PATHS = ['.DS_Store', 'build', 'node_modules', 'package.json'];\n\n/**\n * The main function of the command.\n *\n * @param target Path to the directory where to create the module. Defaults to current working dir.\n * @param command An object from `commander`.\n */\nasync function main(target: string | undefined, options: CommandOptions) {\n  const targetDir = target ? path.join(CWD, target) : CWD;\n\n  await fs.ensureDir(targetDir);\n  await confirmTargetDirAsync(targetDir);\n\n  options.target = targetDir;\n\n  const data = await askForSubstitutionDataAsync(targetDir, options);\n  const packageManager = await resolvePackageManager();\n  const packagePath = options.source\n    ? path.join(CWD, options.source)\n    : await downloadPackageAsync(targetDir);\n  const files = await getFilesAsync(packagePath);\n\n  console.log('🎨 Creating Expo module from the template files...');\n\n  // Iterate through all template files.\n  for (const file of files) {\n    const renderedRelativePath = ejs.render(file.replace(/^\\$/, ''), data, {\n      openDelimiter: '{',\n      closeDelimiter: '}',\n      escape: (value: string) => value.replace('.', path.sep),\n    });\n    const fromPath = path.join(packagePath, file);\n    const toPath = path.join(targetDir, renderedRelativePath);\n    const template = await fs.readFile(fromPath, { encoding: 'utf8' });\n    const renderedContent = ejs.render(template, data);\n\n    await fs.outputFile(toPath, renderedContent, { encoding: 'utf8' });\n  }\n\n  // Install dependencies and build\n  await postActionsAsync(packageManager, targetDir);\n\n  if (!options.source) {\n    // Files in the downloaded tarball are wrapped in `package` dir.\n    // We should remove it after all.\n    await fs.remove(packagePath);\n  }\n  if (!options.withReadme) {\n    await fs.remove(path.join(targetDir, 'README.md'));\n  }\n  if (!options.withChangelog) {\n    await fs.remove(path.join(targetDir, 'CHANGELOG.md'));\n  }\n  if (options.example) {\n    // Create \"example\" folder\n    await createExampleApp(data, targetDir, packageManager);\n  }\n\n  console.log('✅ Successfully created Expo module');\n}\n\n/**\n * Recursively scans for the files within the directory. Returned paths are relative to the `root` path.\n */\nasync function getFilesAsync(root: string, dir: string | null = null): Promise<string[]> {\n  const files: string[] = [];\n  const baseDir = dir ? path.join(root, dir) : root;\n\n  for (const file of await fs.readdir(baseDir)) {\n    const relativePath = dir ? path.join(dir, file) : file;\n\n    if (IGNORES_PATHS.includes(relativePath) || IGNORES_PATHS.includes(file)) {\n      continue;\n    }\n\n    const fullPath = path.join(baseDir, file);\n    const stat = await fs.lstat(fullPath);\n\n    if (stat.isDirectory()) {\n      files.push(...(await getFilesAsync(root, relativePath)));\n    } else {\n      files.push(relativePath);\n    }\n  }\n  return files;\n}\n\n/**\n * Asks NPM registry for the url to the tarball.\n */\nasync function getNpmTarballUrl(packageName: string, version: string = 'latest'): Promise<string> {\n  const { stdout } = await spawnAsync('npm', ['view', `${packageName}@${version}`, 'dist.tarball']);\n  return stdout.trim();\n}\n\n/**\n * Gets the username of currently logged in user. Used as a default in the prompt asking for the module author.\n */\nasync function npmWhoamiAsync(targetDir: string): Promise<string | null> {\n  try {\n    const { stdout } = await spawnAsync('npm', ['whoami'], { cwd: targetDir });\n    return stdout.trim();\n  } catch {\n    return null;\n  }\n}\n\n/**\n * Downloads the template from NPM registry.\n */\nasync function downloadPackageAsync(targetDir: string): Promise<string> {\n  const tarballUrl = await getNpmTarballUrl('expo-module-template');\n\n  console.log('⬇️  Downloading module template from npm...');\n\n  await downloadTarball({\n    url: tarballUrl,\n    dir: targetDir,\n  });\n  return path.join(targetDir, 'package');\n}\n\n/**\n * Installs dependencies and builds TypeScript files.\n */\nasync function postActionsAsync(packageManager: PackageManagerName, targetDir: string) {\n  console.log('📦 Installing module dependencies...');\n  await installDependencies(packageManager, targetDir);\n\n  console.log('🛠  Compiling TypeScript files...');\n  await spawnAsync(packageManager, ['run', 'build'], {\n    cwd: targetDir,\n    stdio: 'ignore',\n  });\n}\n\n/**\n * Asks the user for some data necessary to render the template.\n * Some values may already be provided by command options, the prompt is skipped in that case.\n */\nasync function askForSubstitutionDataAsync(\n  targetDir: string,\n  options: CommandOptions\n): Promise<SubstitutionData> {\n  const defaultPackageSlug = path.basename(targetDir);\n  const useDefaultSlug = options.target && validateNpmPackage(defaultPackageSlug);\n  const defaultProjectName = defaultPackageSlug\n    .replace(/^./, (match) => match.toUpperCase())\n    .replace(/\\W+(\\w)/g, (_, p1) => p1.toUpperCase());\n\n  const promptQueries: CustomPromptObject[] = [\n    {\n      type: 'text',\n      name: 'slug',\n      message: 'What is the package slug?',\n      initial: defaultPackageSlug,\n      resolvedValue: useDefaultSlug ? defaultPackageSlug : null,\n      validate: (input) =>\n        validateNpmPackage(input).validForNewPackages || 'Must be a valid npm package name',\n    },\n    {\n      type: 'text',\n      name: 'name',\n      message: 'What is the project name?',\n      initial: defaultProjectName,\n    },\n    {\n      type: 'text',\n      name: 'description',\n      message: 'How would you describe the module?',\n      validate: (input) => !!input || 'Cannot be empty',\n    },\n    {\n      type: 'text',\n      name: 'package',\n      message: 'What is the Android package name?',\n      initial: `expo.modules.${defaultPackageSlug.replace(/\\W/g, '').toLowerCase()}`,\n    },\n    {\n      type: 'text',\n      name: 'author',\n      message: 'Who is the author?',\n      initial: (await npmWhoamiAsync(targetDir)) ?? '',\n    },\n    {\n      type: 'text',\n      name: 'license',\n      message: 'What is the license?',\n      initial: 'MIT',\n    },\n    {\n      type: 'text',\n      name: 'repo',\n      message: 'What is the repository URL?',\n      validate: (input) => /^https?:\\/\\//.test(input) || 'Must be a valid URL',\n    },\n  ];\n\n  // Stop the process when the user cancels/exits the prompt.\n  const onCancel = () => {\n    process.exit(0);\n  };\n\n  const answers: Record<string, string> = {};\n  for (const query of promptQueries) {\n    const { name, resolvedValue } = query;\n    answers[name] = resolvedValue ?? options[name] ?? (await prompts(query, { onCancel }))[name];\n  }\n\n  const { slug, name, description, package: projectPackage, author, license, repo } = answers;\n\n  return {\n    project: {\n      slug,\n      name,\n      version: '0.1.0',\n      description,\n      package: projectPackage,\n    },\n    author,\n    license,\n    repo,\n  };\n}\n\n/**\n * Checks whether the target directory is empty and if not, asks the user to confirm if he wants to continue.\n */\nasync function confirmTargetDirAsync(targetDir: string): Promise<void> {\n  const files = await fs.readdir(targetDir);\n\n  if (files.length === 0) {\n    return;\n  }\n  const { shouldContinue } = await prompts(\n    {\n      type: 'confirm',\n      name: 'shouldContinue',\n      message: `The target directory ${chalk.magenta(\n        targetDir\n      )} is not empty.\\nDo you want to continue anyway?`,\n      initial: true,\n    },\n    {\n      onCancel: () => false,\n    }\n  );\n  if (!shouldContinue) {\n    process.exit(0);\n  }\n}\n\nconst program = new Command();\n\nprogram\n  .name(packageJson.name)\n  .version(packageJson.version)\n  .description(packageJson.description)\n  .arguments('[target_dir]')\n  .option(\n    '-s, --source <source_dir>',\n    'Local path to the template. By default it downloads `expo-module-template` from NPM.'\n  )\n  .option('-n, --name <module_name>', 'Name of the native module.')\n  .option('-d, --description <description>', 'Description of the module.')\n  .option('-p, --package <package>', 'The Android package name.')\n  .option('-a, --author <author>', 'The author name.')\n  .option('-l, --license <license>', 'The license that the module is distributed with.')\n  .option('-r, --repo <repo_url>', 'The URL to the repository.')\n  .option('--with-readme', 'Whether to include README.md file.', false)\n  .option('--with-changelog', 'Whether to include CHANGELOG.md file.', false)\n  .option('--no-example', 'Whether to skip creating the example app.', false)\n  .action(main);\n\nprogram.parse(process.argv);\n"]}