The added and removed properties of change objects are now guaranteed to be set to a boolean value

kpdecker/jsdiff#455

Author: ryota-ka

types/diff/diff-tests.ts

@@ -73,8 +73,8 @@ examineChanges(changes);
 
 function examineChanges(diff: Diff.Change[]) {
     diff.forEach(part => {
-        part.added; // $ExpectType boolean | undefined
-        part.removed; // $ExpectType boolean | undefined
+        part.added; // $ExpectType boolean
+        part.removed; // $ExpectType boolean
         part.value; // $ExpectType string
         part.count; // $ExpectType number | undefined
     });

types/diff/index.d.ts

@@ -109,13 +109,13 @@ export interface Change {
      */
     value: string;
     /**
-     * `true` if the value was inserted into the new string.
+     * true if the value was inserted into the new string, otherwise false
      */
-    added?: boolean | undefined;
+    added: boolean;
     /**
-     * `true` if the value was removed from the old string.
+     * true if the value was removed from the old string, otherwise false
      */
-    removed?: boolean | undefined;
+    removed: boolean;
 }
 
 export interface ArrayChange<T> {