Added comments to constants for auto-generated docs

src/const.js

@@ -1,28 +1,84 @@
 /**
  * Filter types
  */
+
+/**
+ * Input filter type
+ * @type {String}
+ */
 export const INPUT = 'input';
+/**
+ * Select filter type
+ * @type {String}
+ */
 export const SELECT = 'select';
+/**
+ * Multiple select filter type
+ * @type {String}
+ */
 export const MULTIPLE = 'multiple';
+/**
+ * Checklist filter type
+ * @type {String}
+ */
 export const CHECKLIST = 'checklist';
+/**
+ * None filter type
+ * @type {String}
+ */
 export const NONE = 'none';
 
 /**
  * Key codes
  */
+
+/**
+ * Enter key code
+ * @type {Number}
+ */
 export const ENTER_KEY = 13;
+/**
+ * Tab key code
+ * @type {Number}
+ */
 export const TAB_KEY = 9;
+/**
+ * Escape key code
+ * @type {Number}
+ */
 export const ESC_KEY = 27;
+/**
+ * Up arrow key code
+ * @type {Number}
+ */
 export const UP_ARROW_KEY = 38;
+/**
+ * Down arrow key code
+ * @type {Number}
+ */
 export const DOWN_ARROW_KEY = 40;
 
 /**
  * HTML tags
  */
+
+/**
+ * Header cell tag
+ * @type {String}
+ */
 export const HEADER_TAG = 'TH';
+/**
+ * Cell tag
+ * @type {String}
+ */
 export const CELL_TAG = 'TD';
 
 /**
- * Numeric values
+ * Default values
+ */
+
+/**
+ * Auto filter delay in milliseconds
+ * @type {Number}
  */
 export const AUTO_FILTER_DELAY = 750;