2016-11-05 19:55:51 +03:00
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# Config Validation
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Defining types using arrays may be error-prone, but **graphql-php** provides config validation
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tool to report when config has unexpected structure.
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This validation tool is **disabled by default** because it is time-consuming operation which only
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makes sense during development.
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To enable validation - call: `GraphQL\Type\Definition\Config::enableValidation();` in your bootstrap
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but make sure to restrict it to debug/development mode only.
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# Type Registry
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2016-11-25 14:07:51 +03:00
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**graphql-php** expects that each type in Schema is presented by single instance. Therefore
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2016-11-05 19:55:51 +03:00
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if you define your types as separate PHP classes you need to ensure that each type is referenced only once.
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2017-08-12 17:32:07 +03:00
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Technically you can create several instances of your type (for example for tests), but `GraphQL\Type\Schema`
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2016-11-05 19:55:51 +03:00
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will throw on attempt to add different instances with the same name.
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There are several ways to achieve this depending on your preferences. We provide reference
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implementation below that introduces TypeRegistry class:
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