• JSDoc types are used for type information
• Properties are inferred from assignments in class bodies
• Constructor functions are equivalent to classes
• CommonJS modules are supported
• Classes, functions, and object literals are namespaces
• Object literals are open-ended
• null, undefined, and empty array initializers are of type any or any[]
• Function parameters are optional by default
• Var-args parameter declaration inferred from use of arguments
• Unspecified type parameters default to any
• In extends clause:
• In JSDoc references
• In function calls