first commit

xterminal/source/helpers.ts

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+export const isArray = Array.isArray;
+
+export function isObject(val: unknown): val is object {
+    return typeof val === "object" && val !== null;
+}
+
+export function isFunction(val: unknown): val is (...a: unknown[]) => unknown {
+    return typeof val === "function";
+}
+
+/**
+ * Detecting a mobile browser
+ * https://stackoverflow.com/questions/11381673/detecting-a-mobile-browser
+ */
+
+// TODO: compatibility check
+export function isMobile(): boolean {
+    const _window = window || {};
+    const _navigator = navigator || {};
+    // Check for touch support
+    if ("ontouchstart" in _window || _navigator.maxTouchPoints) {
+        // Check for mobile user agent
+        if (/Mobi/.test(_navigator.userAgent)) {
+            return true;
+        }
+    }
+    return false;
+}