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node_modules/@11ty/eleventy/src/Util/DateGitLastUpdated.js

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+import { spawnAsync } from "./SpawnAsync.js";
+
+async function getGitLastUpdatedTimeStamp(filePath) {
+	try {
+		let timestamp = await spawnAsync(
+			"git",
+			// Formats https://www.git-scm.com/docs/git-log#_pretty_formats
+			// %at author date, UNIX timestamp
+			["log", "-1", "--format=%at", filePath],
+		);
+		return parseInt(timestamp, 10) * 1000;
+	} catch (e) {
+		// do nothing
+	}
+}
+
+// return a Date
+export default async function (inputPath) {
+	let timestamp = await getGitLastUpdatedTimeStamp(inputPath);
+	if (timestamp) {
+		return new Date(timestamp);
+	}
+}