Discovery: Composer TypeError on PSR-4 namespace prefixes with multiple lookup directories

[nayleen]

Tempest version

3.0

PHP version

8.5

Operating system

Linux

Description

See Composer's schema regarding PSR-4 namespace registration: https://getcomposer.org/doc/04-schema.md#psr-4

If you need to search for a same prefix in multiple directories, you can specify them as an array as such:

{
    "autoload": {
        "psr-4": { "Monolog\\": ["src/", "lib/"] }
    }
}

The Composer class currently throws a TypeError in projects where a namespace prefix resides in multiple directories due to (what I understand to be) a wrong assumption about PSR-4 autoload paths:

tempest-framework/packages/discovery/src/Composer.php

Line 41 in 6c8b9fe

->map(fn (string $path, string $namespace) => new Psr4Namespace($namespace, $path))

TypeError: Tempest\Discovery\Composer::{closure:Tempest\Discovery\Composer::load():41}(): Argument #1 ($path) must be of type string, array given, called in /app/src/packages/support/src/Arr/functions.php on line 862

I've taken a step at a reproducing test and a fix in: #2112