Imports cased like the filename

src/ol/AssertionError.js

@@ -0,0 +1,37 @@
+goog.provide('ol.AssertionError');
+
+goog.require('ol');
+
+/**
+ * Error object thrown when an assertion failed. This is an ECMA-262 Error,
+ * extended with a `code` property.
+ * @see {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error}
+ * @constructor
+ * @extends {Error}
+ * @implements {oli.AssertionError}
+ * @param {number} code Error code.
+ */
+ol.AssertionError = function(code) {
+
+  var path = ol.VERSION ? ol.VERSION.split('-')[0] : 'latest';
+
+  /**
+   * @type {string}
+   */
+  this.message = 'Assertion failed. See https://openlayers.org/en/' + path +
+      '/doc/errors/#' + code + ' for details.';
+
+  /**
+   * Error code. The meaning of the code can be found on
+   * {@link https://openlayers.org/en/latest/doc/errors/} (replace `latest` with
+   * the version found in the OpenLayers script's header comment if a version
+   * other than the latest is used).
+   * @type {number}
+   * @api
+   */
+  this.code = code;
+
+  this.name = 'AssertionError';
+
+};
+ol.inherits(ol.AssertionError, Error);