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-rw-r--r--src/ng/directive/input.js3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/ng/directive/input.js b/src/ng/directive/input.js
index 27813a46..3c09c084 100644
--- a/src/ng/directive/input.js
+++ b/src/ng/directive/input.js
@@ -1022,6 +1022,9 @@ var NgModelController = ['$scope', '$exceptionHandler', '$attrs', '$element', '$
* You can override this for input directives whose concept of being empty is different to the
* default. The `checkboxInputType` directive does this because in its case a value of `false`
* implies empty.
+ *
+ * @param {*} value Reference to check.
+ * @returns {boolean} True if `value` is empty.
*/
this.$isEmpty = function(value) {
return isUndefined(value) || value === '' || value === null || value !== value;