TypeScript 4.1

Description

See announcement post¹ for full changelog.

Changes

Flags

• noUncheckedIndexAccess
• checkJs implies allowJs
• TypeScript jsx flag support react-jsx and react-jsxdev

Literal Types

Literal String Type

• TypeScript Template Literal String Type

1. Helpers

   • Uppercase
   • Lowercase
   • Capitalize
   • Uncapitalize

Mapped Type

Clauses

• as

Recursive conditional types

• TypeScript Recursive Conditional Types

Footnotes

Footnotes

1. https://devblogs.microsoft.com/typescript/announcing-typescript-4-1/ ↩