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TypeScript Language Specification（TypeScript语言规范）
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6.9 Type Guard Functions

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  • 6.9 Type Guard Functions

    6.9 Type Guard Functions

    TODO: Document type guard functions, including this type predicates.

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    • TypeScript Language Specification
    • 1 Introduction
      • 1.1 Ambient Declarations
      • 1.2 Function Types
      • 1.3 Object Types
      • 1.4 Structural Subtyping
      • 1.5 Contextual Typing
      • 1.6 Classes
      • 1.7 Enum Types
      • 1.8 Overloading on String Parameters
      • 1.9 Generic Types and Functions
      • 1.10 Namespaces
      • 1.11 Modules
    • 2 Basic Concepts
      • 2.1 Grammar Conventions
      • 2.2 Names
      • 2.3 Declarations
      • 2.4 Scopes
    • 3 Types
      • 3.1 The Any Type
      • 3.2 Primitive Types
      • 3.3 Object Types
      • 3.4 Union Types
      • 3.5 Intersection Types
      • 3.6 Type Parameters
      • 3.7 Named Types
      • 3.8 Specifying Types
      • 3.9 Specifying Members
      • 3.10 Type Aliases
      • 3.11 Type Relationships
      • 3.12 Widened Types
    • 4 Expressions
      • 4.1 Values and References
      • 4.2 The this Keyword
      • 4.3 Identifiers
      • 4.4 Literals
      • 4.5 Object Literals
      • 4.6 Array Literals
      • 4.7 Template Literals
      • 4.8 Parentheses
      • 4.9 The super Keyword
      • 4.10 Function Expressions
      • 4.11 Arrow Functions
      • 4.12 Class Expressions
      • 4.13 Property Access
      • 4.14 The new Operator
      • 4.15 Function Calls
      • 4.16 Type Assertions
      • 4.17 JSX Expressions
      • 4.18 Unary Operators
      • 4.19 Binary Operators
      • 4.20 The Conditional Operator
      • 4.21 Assignment Operators
      • 4.22 The Comma Operator
      • 4.23 Contextually Typed Expressions
      • 4.24 Type Guards
    • 5 Statements
      • 5.1 Blocks
      • 5.2 Variable Statements
      • 5.3 Let and Const Declarations
      • 5.4 If, Do, and While Statements
      • 5.5 For Statements
      • 5.6 For-In Statements
      • 5.7 For-Of Statements
      • 5.8 Continue Statements
      • 5.9 Break Statements
      • 5.10 Return Statements
      • 5.11 With Statements
      • 5.12 Switch Statements
      • 5.13 Throw Statements
      • 5.14 Try Statements
    • 6 Functions
      • 6.1 Function Declarations
      • 6.2 Function Overloads
      • 6.3 Function Implementations
      • 6.4 Destructuring Parameter Declarations
      • 6.5 Generic Functions
      • 6.6 Code Generation
      • 6.7 Generator Functions
      • 6.8 Asynchronous Functions
      • 6.9 Type Guard Functions
    • 7 Interfaces
      • 7.1 Interface Declarations
      • 7.2 Declaration Merging
      • 7.3 Interfaces Extending Classes
      • 7.4 Dynamic Type Checks
    • 8 Classes
      • 8.1 Class Declarations
      • 8.2 Members
      • 8.3 Constructor Declarations
      • 8.4 Property Member Declarations
      • 8.5 Index Member Declarations
      • 8.6 Decorators
      • 8.7 Code Generation
    • 9 Enums
      • 9.1 Enum Declarations
      • 9.2 Enum Members
      • 9.3 Declaration Merging
      • 9.4 Constant Enum Declarations
      • 9.5 Code Generation
    • 10 Namespaces
      • 10.1 Namespace Declarations
      • 10.2 Namespace Body
      • 10.3 Import Alias Declarations
      • 10.4 Export Declarations
      • 10.5 Declaration Merging
      • 10.6 Code Generation
    • 11 Scripts and Modules
      • 11.1 Programs and Source Files
      • 11.2 Scripts
      • 11.3 Modules
    • 12 Ambients
      • 12.1 Ambient Declarations
      • 12.2 Ambient Module Declarations
    • A Grammar
      • A.1 Types
      • A.2 Expressions
      • A.3 Statements
      • A.4 Functions
      • A.5 Interfaces
      • A.6 Classes
      • A.7 Enums
      • A.8 Namespaces
      • A.9 Scripts and Modules
      • A.10 Ambients
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