diff --git a/types/diff/diff-tests.ts b/types/diff/diff-tests.ts
index 55f89fb938b6f49..bdfac4e489f338c 100644
--- a/types/diff/diff-tests.ts
+++ b/types/diff/diff-tests.ts
@@ -21,6 +21,7 @@ Diff.diffLines(
     'line\nold value\nline',
     'line\nnew value\nline',
     {
+        ignoreNewlineAtEof: true,
         maxEditLength: 1,
         oneChangePerToken: true,
     },
diff --git a/types/diff/index.d.ts b/types/diff/index.d.ts
index cc639d000dd01b6..2ac6744908d00c4 100644
--- a/types/diff/index.d.ts
+++ b/types/diff/index.d.ts
@@ -35,6 +35,11 @@ export interface WordsOptions extends BaseOptions {
 }
 
 export interface LinesOptions extends BaseOptions {
+    /**
+     * `true` to ignore a missing newline character at the end of the last line when comparing it to other lines. (By default, the line `'b\n'` in text `'a\nb\nc'` is not considered equal to the line `'b'` in text `'a\nb'`; this option makes them be considered equal.) Ignored if `ignoreWhitespace` or `newlineIsToken` are also true.
+     */
+    ignoreNewlineAtEof?: boolean | undefined;
+
     /**
      * `true` to ignore leading and trailing whitespace. This is the same as `diffTrimmedLines()`.
      */