first commit

demos/simple/src/utils/reading-time.ts

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+import type { PortableTextBlock } from "emdash";
+
+const WORDS_PER_MINUTE = 200;
+const WHITESPACE_REGEX = /\s+/;
+
+/**
+ * Extract plain text from Portable Text blocks
+ */
+export function extractText(blocks: PortableTextBlock[] | undefined): string {
+	if (!blocks || !Array.isArray(blocks)) return "";
+
+	return blocks
+		.filter(
+			(
+				block,
+			): block is PortableTextBlock & {
+				children: Array<{ _type: string; text?: string }>;
+			} => block._type === "block" && Array.isArray(block.children),
+		)
+		.map((block) =>
+			block.children
+				.filter((child) => child._type === "span" && typeof child.text === "string")
+				.map((span) => span.text)
+				.join(""),
+		)
+		.join(" ");
+}
+
+/**
+ * Calculate reading time in minutes from Portable Text content
+ */
+export function getReadingTime(content: PortableTextBlock[] | undefined): number {
+	const text = extractText(content);
+	const wordCount = text.split(WHITESPACE_REGEX).filter(Boolean).length;
+	const minutes = Math.ceil(wordCount / WORDS_PER_MINUTE);
+	return Math.max(1, minutes);
+}
+
+/**
+ * Format reading time for display
+ */
+export function formatReadingTime(minutes: number): string {
+	return `${minutes} min read`;
+}