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Error Identifier: property.readOnlyNoNativeType

Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

Code example #

<?php declare(strict_types = 1);

class Config
{

	/** @var string */
	public readonly $name;

}

Why is it reported? #

A readonly property must have a native type declaration. PHP requires that all readonly properties have an explicit native type (such as string, int, mixed, etc.). A PHPDoc type alone is not sufficient. This is a language-level requirement enforced by the PHP engine.

How to fix it #

Add a native type declaration to the property:

 <?php declare(strict_types = 1);
 
 class Config
 {

-	/** @var string */
-	public readonly $name;
+	public readonly string $name;

 }

If the property can hold multiple types, use a union type or mixed:

 <?php declare(strict_types = 1);
 
 class Config
 {

-	/** @var string|int */
-	public readonly $name;
+	public readonly string|int $name;

 }

How to ignore this error #

You can use the identifier property.readOnlyNoNativeType to ignore this error using a comment:

// @phpstan-ignore property.readOnlyNoNativeType
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: property.readOnlyNoNativeType

Rules that report this error #

• PHPStan\Rules\Properties\ReadOnlyPropertyRule [1]

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