The expression self::$instance; of type WC_Stripe|Singleton adds the type WC_Stripe to the return on line 72 which is incompatible with the return type documented by WC_Stripe::get_instance of type Singleton.
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}
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/**
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* Private clone method to prevent cloning of the instance of the
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* *Singleton* instance.
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*
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* @return void
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*/
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private function __clone() {}
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/**
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* Private unserialize method to prevent unserializing of the *Singleton*
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* instance.
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*
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* @return void
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*/
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private function __wakeup() {}
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/**
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* Protected constructor to prevent creating a new instance of the
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* *Singleton* via the `new` operator from outside of this class.
woocommerce /
woocommerce-gateway-stripe
Mike Jolley
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Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property.
Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property..