If the declared type is not a primitive nor Array (or an array subclass) it'll do generic coercion. When generic coercing a value, Structure will just instantiate the declared type (using new) passing the raw value as the parameter (only if the raw value isn't of the declared type already).
class Location {
constructor({ x, y }) {
this.x = x;
this.y = y;
}
}
const User = attributes({
location: Location,
})(class User {});
const userOne = new User({
location: new Location({ x: 1, y: 2 }),
});
userOne.location; // Location { x: 1, y: 2 } => no coercion was done
const userTwo = new User({
location: { x: 3, y: 4 },
});
userTwo.location; // Location { x: 3, y: 4 } => coerced plain object to Location
Coercion to Date type enters in this same category, so if you have an attribute of the type Date, it'll use new Date(<raw value>) to coerce it. For more info about how this coercion works check the cases for value and dateString parameters on .
