hmr-runtime.js

const { makeApplyHmr } = require('svelte-hmr/runtime');

module.exports.applyHmr = makeApplyHmr(args => {
    // Mark this file as reloadable
    args.m.hot.accept();

    let acceptCallback = null;
    if (args.m.hot.data?.acceptCallback) {
        // svelte-hmr expects accept to work as with nollup or vite
        // applying changes is done synchronously, so we wait until after it is done
        setTimeout(() => args.m.hot.data.acceptCallback(), 10);
    }

    args.m.hot.dispose((data) => {
        if (acceptCallback) {
            data.acceptCallback = acceptCallback;
        }
    });

    return Object.assign({}, args, {
        hot: {
            ...args.m.hot,
            accept(cb) {
                acceptCallback = cb;
            }
        },
        hotOptions: {
            ...(args.hotOptions || {}),
            noOverlay: true
        },
        reload() {
            if (Package && Package.reload) {
                Package.reload.Reload._reload({ immediateMigration: true });
            } else {
                window.location.reload();
            }
        }
    });
});