allow missing fallback

Rich-Harris · Rich-Harris · commit eff94ac840a2 · 2019-03-17T16:14:02.000-04:00
diff --git a/transition.mjs b/transition.mjs
@@ -129,7 +129,7 @@ export function crossfade({ fallback, ...defaults }) {
 				// (i.e. wasn't claimed by the other list)
 				// then we need to supply an outro
 				items.delete(params.key);
-				return fallback(node, params, intro);
+				return fallback && fallback(node, params, intro);
 			};
 		};
 	}

Original file line number	Diff line number	Diff line change
`@@ -129,7 +129,7 @@ export function crossfade({ fallback, ...defaults }) {`
`129`	`129`	`// (i.e. wasn't claimed by the other list)`
`130`	`130`	`// then we need to supply an outro`
`131`	`131`	`items.delete(params.key);`
`132`		`- return fallback(node, params, intro);`
	`132`	`+ return fallback && fallback(node, params, intro);`
`133`	`133`	`};`
`134`	`134`	`};`
`135`	`135`	`}`