Today I Learned

How to dynamically infer TypeScript single object types from tRPC query outputs

This is how you can dynamically infer a single object type from a tRPC Query returning an array of elements of that specific type:

export const exampleRouter = router({
  exampleQuery: exampleQueryImplementation,

// extracting a single object type from an array of that type 
export type ArrayElement<ArrayType extends unknown[] | null> =
  ArrayType extends (infer ElementType)[] ? ElementType : never;

// the output types of a specific router, indexable by query identifiers
type RouterOutput = inferRouterOutputs<typeof exampleRouter>;

// return type of a single query
export type QueryOutputArray = RouterOutput['exampleQuery'];

// the type of each element from the returned array
export type QueryOutputObject = ArrayElement<QueryOutputArray>;

How To Change The Slug of A Custom Post Type in WordPress

To change the slug for a post type in WordPress, you can use the register_post_type() function. Within the arguments array for the function, you can set the rewrite parameter to an array with the new slug you want to use.

Here's an example code snippet:

function change_post_type_slug() {
    $args = array(
        'rewrite' => array( 'slug' => 'new-slug' ),
        // other post type arguments
    register_post_type( 'your_post_type', $args );
add_action( 'init', 'change_post_type_slug' );

In this example, replace your_post_type with the name of the post type you want to change, and replace new-slug with the new slug you want to use.

Once you've added this code to your functions.php file, you'll need to go to Settings > Permalinks in the WordPress admin dashboard and click the "Save Changes" button to update your permalinks. This will ensure that your new slug is properly applied.

How to Configure Traefik to Use Existing TLS Certificates

  1. Create a new file tls.yml
        certFile: /etc/traefik/certs/your-domain.dev/cert.pem
        keyFile: /etc/traefik/certs/your-domain.dev/privkey.pem
  1. Make sure you're copying this file in your Dockerfile

COPY .docker/traefik/conf.d/tls.yml /etc/traefik/tls.yml

  1. Mount the certs folder in your docker-compose.yml file
	- .docker/traefik/certs:/etc/traefik/certs
  1. Update the traefik.yml config to support the file provider:
      filename: "/etc/traefik/tls.yml

How To Keep Your Github Actions Workflows Private in an Open Source Repository

If you want to make your repository open source, but keep the workflows private, you can do the following:

  1. Create a separate repository for your workflows and make it private.
  2. In the open source repository, include only the necessary configuration files (e.g. .github/actions) and reference the private repository as a submodule.
  3. In the private repository, configure the GitHub Actions workflows as you normally would.
  4. When someone clones or forks the open source repository, the submodule reference to the private repository will not be included.

This way, you can keep your workflows private, while still making your repository open source.

Meteor.js powered React hook for retrieving articles with error and loading state handling

The custom hook created uses Meteor's useTracker hook and the subscribe method to subscribe to the article publication, as well as the ArticlesCollection to find the article with the matching _id (which is the same as the slug in this case).

const useArticle = (slug: string): any => {
    const [error, setError] = useState<Error | null>(null)

    return useTracker(() => {
        const sub = Meteor.subscribe('article', { _id: slug })
        if (sub.ready()) {
            const article = ArticlesCollection.findOne({ _id: slug })
            if (article) {
                return {
                    loading: false,
                    error: null,
            } else {
                setError(new Error(`Article with slug "${slug}" not found`))
                return {
                    loading: false,
                    article: undefined,
        } else {
            return {
                loading: true,
                error: null,
                article: undefined,
    }, [slug, setError])

This hook can be used in a React component to display the article, its loading state and error:

const Article = ({ slug }: { slug: string }) => {
    const { loading, error, article } = useArticle(slug)

    if (loading) {
        return <div>Loading...</div>

    if (error) {
        return <div>Error: {error.message}</div>

    return (

Eager Loading with Subqueries in Laravel Eloquent

Eager loading with subqueries allows you to load related models using a subquery instead of joining the tables, which can improve performance in certain situations. For example, if you have a User model and a Post model, you can count the number of posts created by each user in the last month using a subquery like this:

$users = User::withCount(['posts as post_count' => function ($query) {
          ->where('created_at', '>', now()->subMonth());