Object Initializer

Object initializer, written in curly brackets, supports shorthand property notation, trailling comma, spread components (...spreadObject) and a suffix type annotation.

Object initializer can only initialize:

• * (instantiates an empty Object, not allowing spread)
• Map
• Flags enumeration
• Record type
• Class without a DontInit decorator

Additional semantics:

• Using object initializer to initialize a plain object results in an object whose constructor property returns Object.
• Spread elements are evaluated before fields when initializing flags, record or class, that is, anything other than Map.