JS function can be called within twig templates

[DavSeb]

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Explain the problem

Currently it is possible to use JS functions (e.g. parseInt {% for i in range(1, parseInt(data)) %}) in twig templates

Expected Behaviour

The build should fail or at least output a warning

Actual Behaviour

Builds successfully without any warning

[ayusharma]

@pago I want to work on this. Could you please tell me where can I look up for this issue or from where can I start?