Enum transformer

The package ships with a built-in EnumTransformer which can transform PHP enums to TypeScript enums or union types.

It is possible to configure this transformer to generate enums for other types of enums than the native PHP enums by implementing a custom EnumProvider:

use Spatie\TypeScriptTransformer\Transformers\EnumProviders\EnumProvider;

use Spatie\Enum\Enum;
use Spatie\TypeScriptTransformer\PhpNodes\PhpClassNode;

class SpatieEnumProvider implements EnumProvider
{
    public function isEnum(PhpClassNode $phpClassNode): bool
    {
        return $phpClassNode->reflection->isSubclassOf(Enum::class);
    }

    public function isValidUnion(PhpClassNode $phpClassNode): bool
    {
        return true;
    }

    public function resolveCases(PhpClassNode $phpClassNode): array
    {
        /** @var class-string<Enum> $className */
        $className = $phpClassNode->getName();

        return array_map(
            fn (Enum $enum) => [
                'name' => $enum->value,
                'value' => $enum->value,
            ],
            $className::cases()
        );
    }
}

The isEnum method should return whether the provided class node is an enum, the isValidUnion method should return whether the enum can be transformed to a union type rather than a TypeScript enum. The resolveCases method should return an array of cases for the enum which is a mapping of case names to their values.

Within your configuration you can register the transformer as such:

$config->transformer(
    new EnumTransformer(enumProvider: new SpatieEnumProvider())
);