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node_modules/is-absolute-url/index.js

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+// Scheme: https://tools.ietf.org/html/rfc3986#section-3.1
+// Absolute URL: https://tools.ietf.org/html/rfc3986#section-4.3
+const ABSOLUTE_URL_REGEX = /^[a-zA-Z][a-zA-Z\d+\-.]*?:/;
+
+// Windows paths like `c:\`
+const WINDOWS_PATH_REGEX = /^[a-zA-Z]:\\/;
+
+export default function isAbsoluteUrl(url) {
+	if (typeof url !== 'string') {
+		throw new TypeError(`Expected a \`string\`, got \`${typeof url}\``);
+	}
+
+	if (WINDOWS_PATH_REGEX.test(url)) {
+		return false;
+	}
+
+	return ABSOLUTE_URL_REGEX.test(url);
+}