Class SessionThenLocalStorage

static/local.ts:68–107

export const localStorage = new LocalOnlyStorage();

class SessionThenLocalStorage implements Storage {
    get<T>(key: string, ifNotPresent: T): string | T {
        try {
            const sessionValue = window.sessionStorage.getItem(prefix + key);
            if (sessionValue !== null) return sessionValue;
        } catch {
            // Swallow up any security exceptions...
        }
        return localStorage.get<T>(key, ifNotPresent);
    }

    remove(key: string) {
        this.removeSession(key);
        localStorage.remove(key);
    }

    private removeSession(key: string) {
        try {
            window.sessionStorage.removeItem(prefix + key);
        } catch {
            // Swallow up any security exceptions...
        }
    }

    private setSession(key: string, value: string): boolean {
        try {
            window.sessionStorage.setItem(prefix + key, value);
            return true;
        } catch {
            // Swallow up any security exceptions...
        }
        return false;
    }

    set(key: string, value: string): boolean {
        const setBySession = this.setSession(key, value);
        const setByLocal = localStorage.set(key, value);
        return setBySession || setByLocal;
    }
}

export const sessionThenLocalStorage = new SessionThenLocalStorage();