Named type with phpstan-specific formatting cannot be parsed by psalm

[andrew-demb]

Phpstan playground https://phpstan.org/r/5da87ef6-9869-40ca-b851-d4edcac82fba
Psalm playground https://psalm.dev/r/22d155399e

Source (exported types): https://github.com/webonyx/graphql-php/blob/29b5b613bd3ee34f227650f856ee8dd4ce151b88/src/Executor/ExecutionResult.php#L9-L34

---

Expected: there's no error for code that imports type SerializableError

Actual:

ERROR: [InvalidTypeImport](https://psalm.dev/233) - 34:25 - Type alias SerializableError imported from ExecutionResult is not defined on the source class

/**
 * @internal
 *
 * @phpstan-import-type SerializableError from ExecutionResult
 */
class Foo
{
    /**
      * @return SerializableError
     */
    public function format(\Throwable $error): array
    {
        return [
		'message' => 'message',
	];
    }
}

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/22d155399e

<?php

/**
 * Returned after [query execution](executing-queries.md).
 * Represents both - result of successful execution and of a failed one
 * (with errors collected in `errors` prop).
 *
 * Could be converted to [spec-compliant](https://facebook.github.io/graphql/#sec-Response-Format)
 * serializable array using `toArray()`.
 *
 * @phpstan-type SerializableError array{
 *   message: string,
 *   locations?: array<int, array{line: int, column: int}>,
 *   path?: array<int, int|string>,
 *   extensions?: array<string, mixed>
 * }
 * @phpstan-type SerializableErrors array<int, SerializableError>
 * @phpstan-type SerializableResult array{
 *     data?: array<string, mixed>,
 *     errors?: SerializableErrors,
 *     extensions?: array<string, mixed>
 * }
 * @phpstan-type ErrorFormatter callable(\Throwable): SerializableError
 * @phpstan-type ErrorsHandler callable(array<Error> $errors, ErrorFormatter $formatter): SerializableErrors
 *
 * @see \GraphQL\Tests\Executor\ExecutionResultTest
 */
class ExecutionResult 
{}

/**
 * @internal
 *
 * @phpstan-import-type SerializableError from ExecutionResult
 */
class Foo
{
    /**
      * @return SerializableError
     */
    public function format(\Throwable $error): array
    {
        return [
			'message' => 'message',
		];
    }
}

Psalm output (using commit 7428e49):

ERROR: InvalidDocblock - 28:1 - Unexpected space

ERROR: MismatchingDocblockReturnType - 39:17 - Docblock has incorrect return type 'type-alias(ExecutionResult::SerializableError)', should be 'array<array-key, mixed>'

INFO: MixedInferredReturnType - 39:17 - Could not verify return type 'type-alias(ExecutionResult::SerializableError)' for Foo::format

ERROR: InvalidTypeImport - 34:25 - Type alias SerializableError imported from ExecutionResult is not defined on the source class