On June 20, 2024, Microsoft officially released TypeScript 5.5, bringing a multitude of upgraded features for software developers.
TypeScript is an open-source programming language developed and maintained by Microsoft. It is a strict syntactical superset of JavaScript that offers optional static type checking.
TypeScript allows the declaration and description of types. Writing types in code not only enables developers to explain their intent but also allows other tools to check the developer’s code to catch errors like typos, null, and undefined.
If developers use TypeScript in editors such as Visual Studio and VS Code, they can achieve features like autocompletion, code navigation, and refactoring.
Developers who wish to use TypeScript can do so with the following npm command:
shCopy codenpm install -D typescript
Here are the new features introduced in TypeScript 5.5:
- Type predicate inference
- Control flow narrowing for constant index access
- JSDoc @import tag
- Regular expression syntax checking
- Support for new ECMAScript Set methods
- Isolated declarations
- ${configDir} template variable in configuration files
- Querying package.json to generate declaration file dependencies
- Reliability improvements in the editor and watch mode
- Performance and size optimizations
- Easier API usage through ECMAScript modules
- TranspileDeclaration application interface
Significant behavioral changes:
- Deprecated features from TypeScript 5.0 disabled
- Adjustments to lib.d.ts
- Stricter parsing for decorators
- undefined is no longer a definable type name
- Simplified emit for reference directive declarations
Related:
- Why Python Is the Top Choice for Artificial Intelligence
- Explore iOS 18: New On-Device AI Features Unveiled!
- Apple AI Failure: What Happened in This Major Setback?
Disclaimer: This article is created by the original author. The content of the article represents their personal opinions. Our reposting is for sharing and discussion purposes only and does not imply our endorsement or agreement. If you have any objections, please contact us through the provided channels.
