TypeScript Language Specification v1.5

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ParameterList: RequiredParameterList OptionalParameterList RestParameter RequiredParameterList , OptionalParameterList RequiredParameterList , RestParameter OptionalParameterList , RestParameter RequiredParameterList , OptionalParameterList , RestParameter RequiredParameterList: RequiredParameter RequiredParameterList , RequiredParameter RequiredParameter: AccessibilityModifier opt Identifier TypeAnnotation opt Identifier : StringLiteral AccessibilityModifier: public private protected OptionalParameterList: OptionalParameter OptionalParameterList , OptionalParameter OptionalParameter: AccessibilityModifier opt Identifier ? TypeAnnotation opt AccessibilityModifier opt Identifier TypeAnnotation opt Initialiser Identifier ? : StringLiteral RestParameter: ... Identifier TypeAnnotation opt ConstructSignature: new TypeParameters opt ( ParameterList opt ) TypeAnnotation opt IndexSignature: [ Identifier : string ] TypeAnnotation [ Identifier : number ] TypeAnnotation MethodSignature: PropertyName ? opt CallSignature TypeAliasDeclaration: type Identifier = Type ; 158
A.2 Expressions PropertyAssignment: ( Modified ) PropertyName : AssignmentExpression PropertyName CallSignature { FunctionBody } GetAccessor SetAccessor GetAccessor: get PropertyName ( ) TypeAnnotation opt { FunctionBody } SetAccessor: set PropertyName ( Identifier TypeAnnotation opt ) { FunctionBody } ElementList: ( Modified ) Elision opt AssignmentExpression Elision opt SpreadElement ElementList , Elision opt AssignmentExpression ElementList , Elision opt SpreadElement SpreadElement: ... AssignmentExpression CallExpression: ( Modified ) … super ( ArgumentList opt ) super . IdentifierName FunctionExpression: ( Modified ) function Identifier opt CallSignature { FunctionBody } AssignmentExpression: ( Modified ) … ArrowFunctionExpression ArrowFunctionExpression: ArrowFormalParameters => Block ArrowFormalParameters => AssignmentExpression ArrowFormalParameters: CallSignature Identifier Arguments: ( Modified ) TypeArguments opt ( ArgumentList opt ) 159
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TypeScript Language Specification V
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Table of Contents 1 Introduction ..
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4.9.1 Standard Function Expressions
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9.1 Enum Declarations .............
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1 Introduction JavaScript applicati
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1.1 Ambient Declarations An ambient
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call '$' as a function. The behavio
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function getX(p: Point) { return p.
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This TypeScript class declaration c
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Section 9 describes how programmers
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Interface definitions, like the one
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TypeScript modules provide a mechan
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2 Basic Concepts The remainder of t
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Each enum declaration has a declara
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When an identifier is resolved as a
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which infers the type of 'x' to be
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The only possible values for the Vo
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interface Array { length: number; [
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3.4 Union Types Union types represe
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3.5 Type Parameters A type paramete
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3.6 Named Types Classes, interfaces
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3.7.1 Predefined Types The any, num
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TypeMember: PropertySignature CallS
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3.7.8 Constructor Type Literals A c
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3.8.2 Call Signatures A call signat
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RestParameter: ... Identifier TypeA
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IndexSignature: [ Identifier : stri
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Type aliases are referenced using t
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o o If each type in U has an appare
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o o o M is a non-specialized call o
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3.10.5 Contextual Signature Instant
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interface List { data: T; next: Lis
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4.3 Identifiers When an expression
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of the object literal includes a nu
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A super call invokes the constructo
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( id ) => { ... } ( id ) => expr Th
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A dot notation property access of t
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If func is of type Any, or of an ob
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An example: signature are fixed, an
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This rule means that the call to 'f
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4.14.4 The delete Operator The 'del
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Any Boolean Number String Other Any
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where ??= is one of the compound as
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4.18 The Comma Operator The comma o
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function foo(x: number | string) {
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function processValue(value: number
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5 Statements This chapter describes
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BindingProperty: Identifier Initial
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Similarly, an array destructuring d
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5.5 Continue Statements A 'continue
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6 Functions TypeScript extends Java
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function f(x: number) { if (x
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When the output target is ECMAScrip
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101
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An interface has the members specif
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interface Document { createElement(
Page 117 and 118: 8 Classes TypeScript supports class
Page 119 and 120: The following constraints must be s
Page 121 and 122: Private and protected accessibility
Page 123 and 124: interface A { x: number; f: () => v
Page 125 and 126: ConstructorOverloads: ConstructorOv
Page 127 and 128: BaseClass.apply(this, arguments); a
Page 129 and 130: Initializer expressions for instanc
Page 131 and 132: var x = A.create(); // new A() var
Page 133 and 134: MemberVariableAssignments is a sequ
Page 135 and 136: In addition, the '__extends' functi
Page 137 and 138: 9 Enums An enum type is a distinct
Page 139 and 140: An identifier or property access th
Page 141: var Color; (function (Color) { Colo
Page 144 and 145: If the declaration of 'M' above had
Page 146 and 147: module A { export interface X { s:
Page 148 and 149: module outer { var local = 1; expor
Page 150 and 151: where ModuleName is the name of the
Page 152 and 153: DeclarationElement: ExportAssignmen
Page 154 and 155: that source file is considered an e
Page 156 and 157: Unlike a non-instantiated internal
Page 158 and 159: import g = require("./geometry"); v
Page 160 and 161: 12.1.3 Ambient Class Declarations A
Page 162 and 163: An ExternalImportDeclaration in an
Page 164 and 165: PrimaryType: ParenthesizedType Pred
Page 168 and 169: UnaryExpression: ( Modified ) … <
Page 170 and 171: ClassExtendsClause: extends ClassTy
Page 172 and 173: ModuleBody: ModuleElements opt Modu
Page 174 and 175: AmbientClassBodyElements: AmbientCl
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TypeScript Language Specification v1.5

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