Null- and undefined-aware types —strictNullChecks Example Assigned-before-use checking Example Optional parameters and properties Non-null and non-undefined type guards Examp...

keyof and Lookup Types Example Example Mapped Types Partial, Readonly, Record, and Pick Object Spread and Rest Downlevel Async Functions Example tsconfig.json dramaticWelco...

Dynamic Import Expressions String Enums Improved inference for generics Return types as inference targets Type parameter inference from contextual types Stricter checking for g...

Project References Tuples in rest parameters and spread expressions Rest parameters with tuple types Spread expressions with tuple types Generic rest parameters Example Optio...

Mapped types on tuples and arrays Properties declarations on functions Version selection with typesVersions Matching behavior Multiple fields Mapped types on tuples and arr...

Faster subsequent builds with the —incremental flag Composite projects outFile Higher order type inference from generic functions Improvements for ReadonlyArray and readonly tu...

Speed improvements Type-checking speed-ups —incremental improvements The Omit helper type Improved excess property checks in union types The —allowUmdGlobalAccess flag Smarte...

TypeScript 3.4 使用 --incremental 标志加快后续构建 复合项目 outFile 泛型函数的高阶类型推断 改进 ReadonlyArray 和 readonly 元祖 一个与 ReadonlyArray 相关的新语法 readonly 元祖 映射类型修饰语 readonly 和 readonly 数组 ...

TypeScript 3.0 工程引用 剩余参数和展开表达式里的元组 带元组类型的剩余参数 带有元组类型的展开表达式 泛型剩余参数 例子 元组类型里的可选元素 例子 元组类型里的剩余元素 例子 新的unknown 类型 例子 在JSX里支持defaultProps 说明 defaultProps 的确切类型 @types/Reac...

TypeScript 2.5 可选的catch 语句变量 checkJs /@ts-check 模式中的类型断言/转换语法 包去重和重定向 --preserveSymlinks （保留符号链接）编译器选项 TypeScript 2.5 可选的catch 语句变量 得益于@tinganho 所做的工作，TypeScript 2.5实现了一...