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info

Functions:

is_preview 

is_preview() -> bool
Source code in vspreview/api/info.py 
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def is_preview() -> bool:
    c_frame = [inspect.currentframe()]

    while (t := c_frame[-1] and c_frame[-1].f_back):
        c_frame.append(t)

        if t and '__name__' in t.f_locals:
            if t.f_locals['__name__'] == '__vspreview__':
                c_frame.clear()
                return True

    c_frame.clear()
    return False