Uncaught TypeError: PhpParser\Lexer\Emulative::__construct(): Argument #1 ($phpVersion) must be of type ?PhpParser\PhpVersion, array given about infection HOT 4 CLOSED

I didn't deep dive into this issue yet but based on the output issue is related to PHP-Parser 4.18.

As a workaround could you please try to downgrade PHP-Parser to 4.17.1

I'll try to create PR to update PHP-Parser to 4.18 as the minimum version today

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I confim setting the nikic/php-parser version to 4.17.1 worked. Thanks!

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Hey @arall
Seems like you some how installed PHP-Parser 5 and Infection globally.

as based on the exception error Infection passed and array to Lexer while it expects PhpVersion object. So this was added in PHP-Parser 5 https://github.com/nikic/PHP-Parser/blob/v5.0.0/lib/PhpParser/Lexer/Emulative.php#L38

while PHP-Parser 4 still accepts an array: https://github.com/nikic/PHP-Parser/blob/v4.18.0/lib/PhpParser/Lexer/Emulative.php#L44

I'd say it's even not an Infection issue.

Could you please try to update to PHP-Parser 4.18 and run Infection again. I don't think that there will be an issue.

from infection.

Using nikic/php-parser: ^4.17.1 on my project composer.json works fine.
Since infection is installed globally in my env, my project dependencies break the whole thing, as it use version 5 recently (due some other dependencies).
So yeah, seems like the issue is on my side. Sorry!

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