refactor(packages): extract utils package

packages/utils/src/frontmatter.ts

@@ -0,0 +1,31 @@
+import yaml from "js-yaml"
+
+export interface FrontmatterResult<T = Record<string, unknown>> {
+  data: T
+  body: string
+  hadFrontmatter: boolean
+  parseError: boolean
+}
+
+export function parseFrontmatter<T = Record<string, unknown>>(
+  content: string
+): FrontmatterResult<T> {
+  const frontmatterRegex = /^---\r?\n([\s\S]*?)\r?\n?---\r?\n([\s\S]*)$/
+  const match = content.match(frontmatterRegex)
+
+  if (!match) {
+    return { data: {} as T, body: content, hadFrontmatter: false, parseError: false }
+  }
+
+  const yamlContent = match[1]
+  const body = match[2]
+
+  try {
+    // Use JSON_SCHEMA for security - prevents code execution via YAML tags
+    const parsed = yaml.load(yamlContent, { schema: yaml.JSON_SCHEMA })
+    const data = (parsed ?? {}) as T
+    return { data, body, hadFrontmatter: true, parseError: false }
+  } catch {
+    return { data: {} as T, body, hadFrontmatter: true, parseError: true }
+  }
+}