Multiple blog instances

If your site runs more than one blog (e.g. an engineering blog under /engineering and a product blog under /news), register the toast plugin once per blog and point each at the right plugin ID and path:

plugins: [
  [
    'docusaurus-plugin-new-post-toast',
    {
      blog: {
        pluginId: 'engineering-blog',
        path: '/engineering',
      },
      storage: {
        key: 'new-post-toast-engineering', // distinct key per instance
      },
    },
  ],
  [
    'docusaurus-plugin-new-post-toast',
    {
      blog: {
        pluginId: 'product-news',
        path: '/news',
      },
      storage: {
        key: 'new-post-toast-news',
      },
    },
  ],
];

Important: give each instance a distinct storage.key so lastVisit is tracked separately per blog. Otherwise both instances share the same timestamp and posts from the second blog won't trigger toasts the same way.

Single blog with custom instance ID

If you've renamed your default blog's id, pass it through:

[
  'docusaurus-plugin-new-post-toast',
  {
    blog: { pluginId: 'main-blog', path: '/posts' },
  },
];

This must match the id you set on your @docusaurus/plugin-content-blog registration.