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This is your original code:
<slot v-bind:user="user">
It’s potentially confusing because there are two things called user here. The v-bind:user part is going to create a user property within the slotProps object. The other part, ="user", just assigns a value to that property. The fact that this value is also coming from a property called user makes this example somewhat difficult to follow.
For your second example, you could maybe do something like this:
<slot v-bind:user="{ firstName, lastName }">
Note that { firstName, lastName } is a shorthand for { firstName: firstName, lastName: lastName }. It’s just creating an object with two properties. The values for those two properties are coming from your data.
Again this is creating a property called user within the slotProps but this time the value is an object that is being created on the fly.