Reports a Vue component data property that is not a function. Suggests wrapping an object literal with a function.
When defining a component,
data must be declared as a function that returns the initial data object, because the same definition will be used for creating numerous instances. If a plain object is still used for
data, that very object will be shared by reference across all instances created! With a
data function, every time a new instance is created we can simply call it to return a fresh copy of the initial data.
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