Svelte Readonly

Not all stores should be writable outside their module. This enables that. It has no dependencies. It also has no tests, but that's ok. It's not that interesting.

API

This exports readonly as a named and default export. That's it. Readonly takes a writable store and returns a readable store. That's it.

Example

This example lets you subscribe to user changes, but doesn't let you set it outside the logIn/logOut functions. This gets more handy the less you want to accidentally set something incorrectly outside a module. (Adding session timeouts, warnings, etc).

// session.js
import { writable } from 'svelte/store';
import readonly from 'svelte-readonly';

const writableUser = writable(null);

export const user = readonly(writableUser);

export async function logIn(username, password) {
    try {
        writableUser.set(await api.logIn(username, password));
    } catch (err) {
        // handle login error
    }
}

export async function logOut() {
    writableUser.set(null);
}