Microsoft Releases TypeScript 5.5 with Enhanced Features

TapTechNews June 21st - Microsoft yesterday (June 20th) officially released TypeScript 5.5, bringing a large number of upgraded features to software developers.

TypeScript is an open-source programming language developed and maintained by Microsoft, which is a strict syntactic superset of JavaScript and provides optional static type checking.

TypeScript can declare and describe types. Writing types in the code not only allows developers to explain their intentions, but also allows other tools to check the developers' code to catch errors such as typos, null and undefined.

If developers use TypeScript in editors such as Visual Studio and VS Code, they can also realize functions such as auto-completion, code navigation and refactoring.

If developers want to use TypeScript, it can be achieved through the following npm command:

npm install -D typescript

TapTechNews attaches the newly added features in TypeScript 5.5 as follows:

Inferred type predicates

Narrowing of constant index access control flows

JSDoc@import tag

Regular expression syntax check

Support for new ECMAScript Set methods

Isolated declarations

${configDir} template variable in the configuration file

Query package.json to generate the dependency relationship of the declaration file

Improvements in the reliability of the editor and observer mode

Performance and size optimization

Easier use of API through ECMAScript modules

TranspileDeclaration API

Significant behavioral changes:

Disable outdated features of TypeScript 5.0

lib.d.ts adjustments

More rigorous parsing of Decorators

undefined is no longer a definable type name

Simplified reference directive declaration Emit