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- Tutorials
- 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
- TypeScript 3.4
- TypeScript 3.3
- TypeScript 3.2
- TypeScript 3.1
- TypeScript 3.0
- 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
- 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
- TypeScript 2.5
- TypeScript 2.4
- TypeScript 2.3
- TypeScript 2.2
- 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
- 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
- TypeScript 1.3
- TypeScript 1.1
- TypeScript 3.7
- 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
- Overview
- 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
- Project Configuration
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