Returns true if other is an ancestor of self.

Returns true if self is the same as other or if other is an ancestor of self.

Returns true if self is an ancestor of other.

Returns true if other is the same as self or if self is an ancestor of other.

Returns the type for the given key in this named tuple type. Gives a compile error if this is not a named tuple type.

Returns true if self is abstract, otherwise false.

module One; end

abstract struct Two; end

class Three; end

abstract class Four; end

{{One.abstract?}}   # => false
{{Two.abstract?}}   # => true
{{Three.abstract?}} # => false
{{Four.abstract?}}  # => true

Returns all subclasses of this type.

Returns all ancestors of this type.

Returns the last Annotation with the given type attached to this type or NilLiteral if there are none.

Returns an array of annotations with the given type attached to this type, or an empty ArrayLiteral if there are none.

Returns an array of all annotations attached to this type, or an empty ArrayLiteral if there are none.

Returns the class of this type. With this you can, for example, obtain class methods by invoking type.class.methods.

Returns true if self is a #class, otherwise false.

module One; end

class Two; end

struct Three; end

{{One.class?}}   # => false
{{Two.class?}}   # => true
{{Three.class?}} # => false

Returns the class variables of this type.

Returns a constant defined in this type.

If the constant is a constant (like A = 1), then its value as an ASTNode is returned. If the constant is a type, the type is returned as a TypeNode. Otherwise, NilLiteral is returned.

Returns the constants and types defined by this type.

Returns true if this type has a constant. For example DEFAULT_OPTIONS (the name you pass to this method is "DEFAULT_OPTIONS" or :DEFAULT_OPTIONS in this cases).

Returns true if this type has a method. For example default_options (the name you pass to this method is "default_options" or :default_options in this cases).

Returns all the types self is directly included in.

Returns the instance type of this type, if it's a class type, or self otherwise. This is the opposite of #class.

Returns the instance variables of this type. Can only be called from within methods (not top-level code), otherwise will return an empty list.

Returns the keys in this named tuple type. Gives a compile error if this is not a named tuple type.

Returns the instance methods defined by this type, without including inherited methods.

Returns true if self is a module, otherwise false.

module One; end

class Two; end

struct Three; end

{{One.module?}}   # => true
{{Two.module?}}   # => false
{{Three.module?}} # => false

Returns the fully qualified name of this type. Optionally without generic_args if self is a generic type; see #type_vars.

class Foo(T); end

module Bar::Baz; end

{{Bar::Baz.name}}                 # => Bar::Baz
{{Foo.name}}                      # => Foo(T)
{{Foo.name(generic_args: false)}} # => Foo

Returns true if nil is an instance of self, otherwise false.

{{String.nilable?}}                   # => false
{{String?.nilable?}}                  # => true
{{Union(String, Bool, Nil).nilable?}} # => true
{{NoReturn.nilable?}}                 # => false
{{Value.nilable?}}                    # => true

Determines if self overrides any method named method from type type.

class Foo
  def one
    1
  end

  def two
    2
  end
end

class Bar < Foo
  def one
    11
  end
end

{{ Bar.overrides?(Foo, "one") }} # => true
{{ Bar.overrides?(Foo, "two") }} # => false

Returns self. This method exists so you can safely call #resolve on a node and resolve it to a type, even if it's a type already.

Returns self. This method exists so you can safely call #resolve on a node and resolve it to a type, even if it's a type already.

Returns the number of elements in this tuple type or tuple metaclass type. Gives a compile error if this is not one of those types.

Returns true if self is a struct, otherwise false.

module One; end

class Two; end

struct Three; end

{{One.struct?}}   # => false
{{Two.struct?}}   # => false
{{Three.struct?}} # => true

Returns the direct subclasses of this type.

Returns the direct superclass of this type.

Returns the type variables of the generic type. If the type is not generic, an empty array is returned.

Returns true if self is a union type, otherwise false.

See also: #union_types.

{{String.union?}}              # => false
{{String?.union?}}             # => true
{{Union(String, Bool).union?}} # => true

Returns the types forming a union type, if this is a union type. Otherwise returns this single type inside an array literal (so you can safely call #union_types on any type and treat all types uniformly).

See also: #union?.