[翻译] Announcing TypeScript 5.5

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原文 https://devblogs.microsoft.com/typescript/announcing-typescript-5-5/

如何安装

npm install -D typescript@rc

TypeScript 5.5新特性一览

• Inferred Type Predicates 推导生成类型断言
• Control Flow Narrowing for Constant Indexed Accesses
• Type Imports in JSDoc
• Regular Expression Syntax Checking
• Support for New ECMAScript Set Methods
• Isolated Declarations
• The ${configDir} Template Variable for Configuration Files
• Consulting package.json Dependencies for Declaration File Generation
• Editor and Watch-Mode Reliability Improvements
• Performance and Size Optimizations
• Easier API Consumption from ECMAScript Modules
• The transpileDeclaration API
• Notable Behavioral Changes
  • Disabling Features Deprecated in TypeScript 5.0
  • lib.d.ts Changes
  • Respecting File Extensions and package.json in Other Module Modes
  • Stricter Parsing for Decorators
  • undefined is No Longer a Definable Type Name
  • Simplified Reference Directive Declaration Emit

推导生成类型断言

控制流类型窄化支持常量到索引访问

// function binarySearch