Added checks to make sure the specified track exists

Added precondition checks to validate input files and paths to return more informative error messages as per #2

node_modules/jest-util/build/isInteractive.js

@@ -0,0 +1,26 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+exports.default = void 0;
+
+function _isCi() {
+  const data = _interopRequireDefault(require('is-ci'));
+
+  _isCi = function _isCi() {
+    return data;
+  };
+
+  return data;
+}
+
+function _interopRequireDefault(obj) {
+  return obj && obj.__esModule ? obj : {default: obj};
+}
+
+// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+var _default =
+  !!process.stdout.isTTY && process.env.TERM !== 'dumb' && !_isCi().default;
+
+exports.default = _default;