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TypeScript 3.7 Document
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TypeScript 2.9

 来源:微软 浏览 446 扫码 分享 2019-11-18 07:58:48
  • TypeScript 2.9

    TypeScript 2.9

    • Support number and symbol named properties with keyof and mapped types
    • Generic type arguments in JSX elements
    • Generic type arguments in generic tagged templates
    • import types
    • Relaxing declaration emit visiblity rules
    • Support for import.meta
    • New –resolveJsonModule
    • –pretty output by default
    • New –declarationMap
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    • Tutorials
      • TypeScript in 5 minutes
      • ASP.NET Core
      • Gulp
      • Migrating from JavaScript
      • React & Webpack
    • What's New
      • Overview
        • TypeScript 3.7
          • Optional Chaining
          • Nullish Coalescing
          • Assertion Functions
          • Better Support for never-Returning Functions
          • (More) Recursive Type Aliases
          • –declaration and –allowJs
          • The useDefineForClassFields Flag and The declare Property Modifier
          • Build-Free Editing with Project References
          • Uncalled Function Checks
          • // @ts-nocheck in TypeScript Files
          • Semicolon Formatter Option
          • 3.7 Breaking Changes
        • TypeScript 3.6
          • Stricter Generators
          • More Accurate Array Spread
          • Improved UX Around Promises
          • Better Unicode Support for Identifiers
          • import.meta Support in SystemJS
          • get and set Accessors Are Allowed in Ambient Contexts
          • Ambient Classes and Functions Can Merge
          • APIs to Support –build and –incremental
          • Semicolon-Aware Code Edits
          • Smarter Auto-Import Syntax
          • await Completions on Promises
          • New TypeScript Playground
        • TypeScript 3.5
          • Speed improvements
          • The Omit helper type
          • The –allowUmdGlobalAccess flag
          • Smarter union type checking
          • Higher order type inference from generic constructors
        • TypeScript 3.4
          • Faster subsequent builds with the –incremental flag
          • Higher order type inference from generic functions
          • Improvements for ReadonlyArray and readonly tuples
          • const assertions
          • Type-checking for globalThis
        • TypeScript 3.3
          • Improved behavior for calling union types
          • Incremental file watching for composite projects in –build –watch
        • TypeScript 3.2
          • strictBindCallApply
          • Generic spread expressions in object literals
          • Generic object rest variables and parameters
          • BigInt
          • Non-unit types as union discriminants
          • tsconfig.json inheritance via Node.js packages
          • The new –showConfig flag
          • Object.defineProperty declarations in JavaScript
        • TypeScript 3.1
          • Mapped types on tuples and arrays
          • Properties declarations on functions
          • Version selection with typesVersions
        • TypeScript 3.0
          • Tuples in rest parameters and spread expressions
          • New unknown top type
          • Support for defaultProps in JSX
          • reference directives
        • TypeScript 2.9
          • Support number and symbol named properties with keyof and mapped types
          • Generic type arguments in JSX elements
          • Generic type arguments in generic tagged templates
          • import types
          • Relaxing declaration emit visiblity rules
          • Support for import.meta
          • New –resolveJsonModule
          • –pretty output by default
          • New –declarationMap
        • TypeScript 2.8
          • Conditional Types
          • Improved control over mapped type modifiers
          • Improved keyof with intersection types
          • Better handling for namespace patterns in .js files
          • Per-file JSX factories
          • Locally scoped JSX namespaces
          • New –emitDeclarationsOnly
        • TypeScript 2.7
          • Constant-named properties
          • Strict Class Initialization
          • Definite Assignment Assertions
          • Fixed Length Tuples
          • Improved type inference for object literals
          • Improved handling of structurally identical classes and instanceof expressions
          • Type guards inferred from in operator
          • Support for import d from "cjs" form CommonJS modules with –esModuleInterop
          • Numeric separators
          • Cleaner output in –watch mode
          • Prettier –pretty output
        • TypeScript 2.6
          • Strict function types
          • Support for JSX Fragment Syntax
          • Cache tagged template objects in modules
          • Localized diagnostics on the command line
          • Suppress errors in .ts files using ‘// @ts-ignore’ comments
          • Faster tsc –watch
          • Write-only references now flagged as unused
        • TypeScript 2.5
          • Optional catch clause variables
          • Type assertion/cast syntax in checkJs/@ts-check mode
          • Deduplicated and redirected packages
          • The –preserveSymlinks compiler flag
        • TypeScript 2.4
          • Dynamic Import Expressions
          • String Enums
          • Improved inference for generics
          • Strict contravariance for callback parameters
          • Weak Type Detection
        • TypeScript 2.3
          • Generators and Iteration for ES5/ES3
          • Async Iteration
          • Generic parameter defaults
          • New –strict master option
          • Enhanced –init output
          • Errors in .js files with –checkJs
        • TypeScript 2.2
          • Support for Mix-in classes
          • object type
          • Support for new.target
          • Better checking for null/undefined in operands of expressions
          • Dotted property for types with string index signatures
          • Support for spread operator on JSX element children
          • New jsx: react-native
        • TypeScript 2.1
          • keyof and Lookup Types
          • Mapped Types
          • Partial, Readonly, Record, and Pick
          • Object Spread and Rest
          • Downlevel Async Functions
          • Support for external helpers library (tslib)
          • Untyped imports
          • Support for –target ES2016, –target ES2017 and –target ESNext
          • Improved any Inference
          • Implicit any errors
          • Better inference for literal types
          • Use returned values from super calls as ‘this’
          • Configuration inheritance
          • New –alwaysStrict
        • TypeScript 2.0
          • Null- and undefined-aware types
          • Control flow based type analysis
          • Tagged union types
          • The never type
          • Read-only properties and index signatures
          • Specifying the type of this for functions
          • Glob support in tsconfig.json
          • Module resolution enhancements: BaseUrl, Path mapping, rootDirs and tracing
          • Shorthand ambient module declarations
          • Wildcard character in module names
          • Support for UMD module definitions
          • Optional class properties
          • Private and Protected Constructors
          • Abstract properties and accessors
          • Implicit index signatures
          • Including built-in type declarations with –lib
          • Flag unused declarations with –noUnusedParameters and –noUnusedLocals
          • Module identifiers allow for .js extension
          • Support ‘target : es5’ with ‘module: es6’
          • Trailing commas in function parameter and argument lists
          • New –skipLibCheck
          • Allow duplicate identifiers across declarations
          • New –declarationDir
        • TypeScript 1.8
          • Type parameters as constraints
          • Control flow analysis errors
          • Stateless Function Components in React
          • Simplified props type management in React
          • Augmenting global/module scope from modules
          • String literal types
          • Improved union/intersection type inference
          • Concatenate AMD and System modules with –outFile
          • Support for default import interop with SystemJS
          • Allow captured let/const in loops
          • Improved checking for for..in statements
          • Modules are now emitted with a "use strict"; prologue
          • Including .js files with –allowJs
          • Custom JSX factories using –reactNamespace
          • this-based type guards
          • Official TypeScript NuGet package
          • Prettier error messages from tsc
          • Colorization of JSX code in VS 2015
          • The –project (-p) flag can now take any file path
          • Allow comments in tsconfig.json
          • Support output to IPC-driven files
          • Improved support for tsconfig.json in Visual Studio 2015
        • TypeScript 1.7
          • async/await support in ES6 targets (Node v4+)
          • Support for –target ES6 with –module
          • this-typing
          • ES7 exponentiation operator
          • Improved checking for destructuring object literal
          • Support for decorators when targeting ES3
        • TypeScript 1.6
          • JSX support
          • Intersection types
          • Local type declarations
          • Class expressions
          • Extending expressions
          • abstract classes and methods
          • Generic type aliases
          • Stricter object literal assignment checks
          • ES6 generators
          • Experimental support for async functions
          • Nightly builds
          • Adjustments in module resolution logic
          • Merging ambient class and interface declaration
          • User-defined type guard functions
          • exclude property support in tsconfig.json
          • –init command line option
        • TypeScript 1.5
          • ES6 Modules
          • Destructuring in declarations and assignments
          • namespace keyword
          • let and const support
          • for..of support
          • Decorators
          • Computed properties
          • Support for UMD and System module output
          • Unicode codepoint escapes in strings
          • Tagged template strings in ES3/ES5
          • AMD-dependency optional names
          • Project support through tsconfig.json
          • –rootDir command line option
          • –noEmitHelpers command line option
          • –newLine command line option
          • –inlineSourceMap and inlineSources command line options
        • TypeScript 1.4
          • Union types
          • let declarations
          • const declarations
          • Template strings
          • Type Guards
          • Type Aliases
          • const enum (completely inlined enums)
          • -noEmitOnError commandline option
          • AMD Module names
        • TypeScript 1.3
          • Protected
          • Tuple types
        • TypeScript 1.1
          • Performance Improvements
          • Better Module Visibility Rules
      • TypeScript 3.7
      • TypeScript 3.6
      • TypeScript 3.5
      • TypeScript 3.4
      • TypeScript 3.3
      • TypeScript 3.2
      • TypeScript 3.1
      • TypeScript 3.0
      • TypeScript 2.9
      • TypeScript 2.8
      • TypeScript 2.7
      • TypeScript 2.6
      • TypeScript 2.5
      • TypeScript 2.4
      • TypeScript 2.3
      • TypeScript 2.2
      • TypeScript 2.1
      • TypeScript 2.0
      • TypeScript 1.8
      • TypeScript 1.7
      • TypeScript 1.6
      • TypeScript 1.5
      • TypeScript 1.4
      • TypeScript 1.3
      • TypeScript 1.1
    • Handbook
      • Basic Types
      • Variable Declarations
      • Interfaces
      • Classes
      • Functions
      • Generics
      • Enums
      • Type Inference
      • Type Compatibility
      • Advanced Types
      • Symbols
      • Iterators and Generators
      • Modules
      • Namespaces
      • Namespaces and Modules
      • Module Resolution
      • Declaration Merging
      • JSX
      • Decorators
      • Mixins
      • Triple-Slash Directives
      • Type Checking JavaScript Files
      • Utility Types
    • Declaration Files
      • Introduction
      • Library Structures
      • By Example
      • Do's and Don'ts
      • Deep Dive
      • Templates
      • Publishing
      • Consumption
    • Project Configuration
      • tsconfig.json
      • Compiler Options
      • Project References
      • Compiler Options in MSBuild
      • Integrating with Build Tools
      • Nightly Builds
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