1 files changed, 59 insertions, 0 deletions
diff --git a/packages/create-astro/src/actions/shared.ts b/packages/create-astro/src/actions/shared.ts
new file mode 100644
index 000000000..da19677d0
--- /dev/null
+++ b/packages/create-astro/src/actions/shared.ts
@@ -0,0 +1,59 @@
+import fs from 'node:fs';
+
+// Some existing files and directories can be safely ignored when checking if a directory is a valid project directory.
+// https://github.com/facebook/create-react-app/blob/d960b9e38c062584ff6cfb1a70e1512509a966e7/packages/create-react-app/createReactApp.js#L907-L934
+const VALID_PROJECT_DIRECTORY_SAFE_LIST = [
+	'.DS_Store',
+	'.git',
+	'.gitkeep',
+	'.gitattributes',
+	'.gitignore',
+	'.gitlab-ci.yml',
+	'.hg',
+	'.hgcheck',
+	'.hgignore',
+	'.idea',
+	'.npmignore',
+	'.travis.yml',
+	'.yarn',
+	'.yarnrc.yml',
+	'docs',
+	'LICENSE',
+	'mkdocs.yml',
+	'Thumbs.db',
+	/\.iml$/,
+	/^npm-debug\.log/,
+	/^yarn-debug\.log/,
+	/^yarn-error\.log/,
+];
+
+export function isEmpty(dirPath: string) {
+	if (!fs.existsSync(dirPath)) {
+		return true;
+	}
+
+	const conflicts = fs.readdirSync(dirPath).filter((content) => {
+		return !VALID_PROJECT_DIRECTORY_SAFE_LIST.some((safeContent) => {
+			return typeof safeContent === 'string' ? content === safeContent : safeContent.test(content);
+		});
+	});
+
+	return conflicts.length === 0;
+}
+
+function isValidName(projectName: string) {
+	return /^(?:@[a-z\d\-*~][a-z\d\-*._~]*\/)?[a-z\d\-~][a-z\d\-._~]*$/.test(projectName);
+}
+
+export function toValidName(projectName: string) {
+	if (isValidName(projectName)) return projectName;
+
+	return projectName
+		.trim()
+		.toLowerCase()
+		.replace(/\s+/g, '-')
+		.replace(/^[._]/, '')
+		.replace(/[^a-z\d\-~]+/g, '-')
+		.replace(/^-+/, '')
+		.replace(/-+$/, '');
+}