types

The types tag declares the types of template variables.

To do this, specify a mapping of names to their types as strings.

Here is how to declare that is_correct is a boolean, while score is an integer (see note below):

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{% types {
    is_correct: 'bool',
    score: 'int',
} %}

You can declare variables as optional by adding the ? suffix:

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{% types {
    is_correct: 'bool',
    score?: 'int',
} %}

By default, this tag does not affect the template compilation or runtime behavior.

Its purpose is to enable designers and developers to document and specify the context's available and/or required variables. While Twig itself does not validate variables or their types, this tag enables extensions to do this.

Additionally, Twig extensions can analyze these tags to perform compile-time and runtime analysis of templates.