/
bfcache.ts
32 lines (28 loc) · 955 Bytes
/
bfcache.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
/*
* Copyright 2020 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
interface onBFCacheRestoreCallback {
(event: PageTransitionEvent): void;
}
let isPersisted = false;
export const isBFCacheRestore = () => isPersisted;
export const onBFCacheRestore = (cb: onBFCacheRestoreCallback) => {
addEventListener('pageshow', (event) => {
if (event.persisted) {
isPersisted = true;
cb(event);
}
}, true);
};