meta library Null safety

Classes

Immutable
Used to annotate a class. [...]
Required
Used to annotate a named parameter p in a method or function f. [...]
UseResult
See useResult for more details.

Constants

alwaysThrows → const _AlwaysThrows
Used to annotate a function f. Indicates that f always throws an exception. Any functions that override f, in class inheritance, are also expected to conform to this contract. [...]
_AlwaysThrows()
checked → const _Checked
Used to annotate a parameter of an instance method that overrides another method. [...]
@Deprecated('Use the `covariant` modifier instead')
_Checked()
doNotStore → const _DoNotStore
Used to annotate a method, getter or top-level getter or function to indicate that the value obtained by invoking it should not be stored in a field or top-level variable. The annotation can also be applied to a class to implicitly annotate all of the valid members of the class, or applied to a library to annotate all of the valid members of the library, including classes. If a value returned by an element marked as doNotStore is returned from a function or getter, that function or getter should be similarly annotated. [...]
_DoNotStore()
experimental → const _Experimental
Used to annotate a library, or any declaration that is part of the public interface of a library (such as top-level members, class members, and function parameters) to indicate that the annotated API is experimental and may be removed or changed at any-time without updating the version of the containing package, despite the fact that it would otherwise be a breaking change. [...]
_Experimental()
factory → const _Factory
Used to annotate an instance or static method m. Indicates that m must either be abstract or must return a newly allocated object or null. In addition, every method that either implements or overrides m is implicitly annotated with this same annotation. [...]
_Factory()
immutable → const Immutable
Used to annotate a class C. Indicates that C and all subtypes of C must be immutable. [...]
internal → const _Internal
Used to annotate a declaration which should only be used from within the package in which it is declared, and which should not be exposed from said package's public API. [...]
_Internal()
isTest → const _IsTest
Used to annotate a test framework function that runs a single test. [...]
_IsTest()
isTestGroup → const _IsTestGroup
Used to annotate a test framework function that runs a group of tests. [...]
_IsTestGroup()
literal → const _Literal
Used to annotate a const constructor c. Indicates that any invocation of the constructor must use the keyword const unless one or more of the arguments to the constructor is not a compile-time constant. [...]
_Literal()
mustCallSuper → const _MustCallSuper
Used to annotate an instance method m. Indicates that every invocation of a method that overrides m must also invoke m. In addition, every method that overrides m is implicitly annotated with this same annotation. [...]
_MustCallSuper()
nonVirtual → const _NonVirtual
Used to annotate an instance member (method, getter, setter, operator, or field) m in a class C or mixin M. Indicates that m should not be overridden in any classes that extend or mixin C or M. [...]
_NonVirtual()
optionalTypeArgs → const _OptionalTypeArgs
Used to annotate a class, mixin, extension, function, method, or typedef declaration C. Indicates that any type arguments declared on C are to be treated as optional. [...]
_OptionalTypeArgs()
protected → const _Protected
Used to annotate an instance member in a class or mixin which is meant to be visible only within the declaring library, and to other instance members of the class or mixin, and their subtypes. [...]
_Protected()
required → const Required
Used to annotate a named parameter p in a method or function f. Indicates that every invocation of f must include an argument corresponding to p, despite the fact that p would otherwise be an optional parameter. [...]
sealed → const _Sealed
Annotation marking a class as not allowed as a super-type. [...]
_Sealed()
useResult → const UseResult
Used to annotate a method, field, or getter within a class, mixin, or extension, or a or top-level getter, variable or function to indicate that the value obtained by invoking it should be use. A value is considered used if it is assigned to a variable, passed to a function, or used as the target of an invocation, or invoked (if the result is itself a function). [...]
virtual → const _Virtual
Used to annotate a field that is allowed to be overridden in Strong Mode. [...]
@Deprecated('No longer has meaning')
_Virtual()
visibleForOverriding → const _VisibleForOverriding
Used to annotate an instance member that was made public so that it could be overridden but that is not intended to be referenced from outside the defining library. [...]
_VisibleForOverriding()
visibleForTesting → const _VisibleForTesting
Used to annotate a declaration that was made public, so that it is more visible than otherwise necessary, to make code testable. [...]
_VisibleForTesting()