From bd402d4157ad0e08cce42a28f2c859fc774e5bad Mon Sep 17 00:00:00 2001
From: Jack <szdc@users.noreply.github.com>
Date: Wed, 11 Apr 2018 03:28:26 +1000
Subject: [PATCH] fix(diff): update diffArrays return value type to support
 arrays (#24869)

---
 types/diff/diff-tests.ts | 12 ++++++++++--
 types/diff/index.d.ts    |  9 ++++++++-
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/types/diff/diff-tests.ts b/types/diff/diff-tests.ts
index f859a735b4..0dea2a305e 100644
--- a/types/diff/diff-tests.ts
+++ b/types/diff/diff-tests.ts
@@ -5,8 +5,16 @@ const other = 'beep boob blah';
 let diff = jsdiff.diffChars(one, other);
 printDiff(diff);
 
-diff = jsdiff.diffArrays(['a', 'b', 'c'], ['a', 'c', 'd']);
-printDiff(diff);
+const diffArraysResult = jsdiff.diffArrays<string>(['a', 'b', 'c'], ['a', 'c', 'd']);
+diffArraysResult.forEach(result => {
+    if (result.added) {
+        console.log(`added ${result.value.length} line(s):`, ...result.value);
+    } else if (result.removed) {
+        console.log(`removed ${result.value.length} line(s):`, ...result.value);
+    } else {
+        console.log(`no changes`);
+    }
+});
 
 // --------------------------
 
diff --git a/types/diff/index.d.ts b/types/diff/index.d.ts
index 2017b43e0e..33d337d1b7 100644
--- a/types/diff/index.d.ts
+++ b/types/diff/index.d.ts
@@ -29,6 +29,13 @@ declare namespace JsDiff {
         removed?: boolean;
     }
 
+    interface IDiffArraysResult<T> {
+        value: T[];
+        count?: number;
+        added?: boolean;
+        removed?: boolean;
+    }
+
     interface IBestPath {
         newPos: number;
         componenets: IDiffResult[];
@@ -85,7 +92,7 @@ declare namespace JsDiff {
 
     function diffSentences(oldStr: string, newStr: string, options?: IOptions): IDiffResult[];
 
-    function diffArrays(oldArr: any[], newArr: any[], options?: IArrayOptions): IDiffResult[];
+    function diffArrays<T>(oldArr: T[], newArr: T[], options?: IArrayOptions): Array<IDiffArraysResult<T>>;
 
     function createPatch(fileName: string, oldStr: string, newStr: string, oldHeader: string, newHeader: string, options?: {context: number}): string;