Unable to handle non-array psr-4 autoload directories

[edmondscommerce]

If you set your psr-4 autoload directory as:

    "autoload": {
        "psr-4": {
            "EdmondsCommerce\\Vault\\": "src/"
        }
    },

Rather than:

    "autoload": {
        "psr-4": {
            "EdmondsCommerce\\Vault\\": [
                "src/"
            ]
        }
    },

Then you get the following error:

PHP Fatal error:  Uncaught EdmondsCommerce\DoctrineStaticMeta\Exception\ErrorException: Invalid argument supplied for foreach()

The issue is in NamespaceHelper->getProjectRootNamespaceFromComposerJson():427

// ...
                foreach ($json['autoload']['psr-4'] as $namespace => $dirs) {
                    foreach ($dirs as $dir) { // <-- Here $dirs is a string
                        $dir = trim($dir, '/');
                        if ($dir === $dirForNamespace) {
                            return $this->tidy(rtrim($namespace, '\\'));
                        }
                    }
                }
// ...

[edmondscommerce]

Will need to change the JSON decode to force assoc, it's just a bool flag

[edmondscommerce]

actually scratch that, we need to check if its an array and then if not give a more helpful error message