lang-js-typescript-latest-changelog.md

title	tags	created	modified
lang-js-typescript-latest-changelog	changelog lang typescript	2020-07-14T02:36:53.471Z	2020-07-14T12:06:37.292Z

lang-js-typescript-latest-changelog

guide

• typescript /Apache2.0/53kStar/201908
  • https://www.typescriptlang.org
  • https://github.com/Microsoft/TypeScript
• flow /MIT/2kStar/201908
  • https://flow.org/
  • https://github.com/facebook/flow
• ref
  • https://devblogs.microsoft.com/typescript/announcing-typescript-4-0-beta/
  • https://devblogs.microsoft.com/typescript/announcing-typescript-3-0/
  • https://devblogs.microsoft.com/typescript/announcing-typescript-2-0/

changelog-overview

• Between TypeScript 1.0 and up until 2.0, the language added union types, type guards, modern ECMAScript support, type aliases, JSX support, literal types, and polymorphic this types.
• If we include TypeScript 2.0 with its introduction of non-nullable types, control flow analysis, tagged union support, this-types, and a simplified model around .d.ts file acquisition, that era truly defined the fundamentals of using TypeScript.
• TypeScript 2.1 was a foundational release that introduced a static model for metaprogramming in JavaScript. The key query ( keyof ), indexed access ( T[K] ), and mapped object ( { [K in keyof T]: T[K] } ) types have been instrumental in better modeling libraries like React, Ember, Lodash, and more.
• TypeScript 2.2 and 2.3 brought support for mixin patterns, the non-primitive object type, and generic defaults, used by a number of projects like Angular Material and Polymer.
• TypeScript 2.4 and 2.6 tightened up the story for strict checking on function types
• TypeScript 2.8 introduced conditional types, a powerful tool for statically expressing decisions based on types, and 2.9 generalized keyof and provided easier imports for types.

changelog

• 4.0.0-beta-202006
  • Variadic Tuple Types 可变元组类型
    • spreads in tuple type syntax can now be generic
    • 4.0 improves the inference process for rest parameters and rest tuple elements
  • Labeled Tuple Elements
    • lack of labels on tuple positions can make them harder to use
  • Class Property Inference from Constructors
  • Short-Circuiting Assignment Operators for &&=, ||=,??=
  • Customize the fragment factory through the new jsxFragmentFactory option
  • /** @deprecated */ JSDoc comment
    • deprecated values are typically displayed a strike-though style
  • breaking-changes
  • Operands for delete must be optional.
• 3.5.3-201907
• 3.0.0-201807
  • Project references
    • allow TypeScript projects to depend on other TypeScript projects
    • specifically, allowing tsconfig.json files to reference other tsconfig.json files.
  • Extracting and spreading parameter lists with tuples
    • allow rest parameters to be generic, and inferring those generics as tuple types
  • Richer tuple types
    • tuples now allow trailing optional elements
  • The unknown type
    • this can be any value, so you must perform some type of checking before you use it
    • Much like any, any value is assignable to unknown;
    • however, unlike any, unknown is assignable to almost nothing else without a type assertion.
  • Support for defaultProps in JSX
  • /// <reference lib="..." /> directive
    • provides a new way for files to declare the built-in APIs
• 2.0.2-201608
  • Null- and undefined-aware types
  • The never type
  • Specifying the type of this for functions
    • By default the type of this inside a function is any .
    • this parameters are fake parameters that come first in the parameter list of a function
  • Tagged union types
    • also called discriminated unions, disjoint unions, or algebraic data types
  • Simplified Declaration File ( .d.ts ) Acquisition
  • The readonly Modifier
• 1.5.3-201507
• 1.1-201409
  • The 1.1 compiler is typically around 4x faster than any previous release
• initial-2012