LIFF(LINE Front-end Framework) SDK stub locally.
Using npm:
npm install liff-sdk-local --save-dev
Using yarn:
yarn add liff-sdk-local --dev
Directly include it in html:
<script src="https://cdn.jsdelivr.net/npm/liff-sdk-local/dist/liff-sdk-local.min.js"></script>
See example.