TypeScript 5.9 brings evaluation of deferred modules, expandable Hovers

TypeScript 5.9, an update of the Microsoft JavaScript superset with syntax for types, has moved to a stage of launch candidate. The new version of TypeScript provides support for the evaluation of the Deferred Module of Ecmascript and a preview of the expandable Hovers to see the details of the type of variable.

The launch candidate of TypeScript 5.9 (RC), announced on July 25The July 8 Beta. The RC also restores AbortSignal.abort() To the Dom library, among other reported solutions. Current TypeScript users can update TypeScript 5.9 running the NPM command npm install -D typescript@rc.

With support for Ecmascript Deferred Module EvaluationTypeScript 5.9 Use the new import defer Syntax, which allows developers to import a module without immediately executing the module and its dependencies. This provides better control over when work and side effects occur, according to Microsoft. The key benefit of import defer It is the module will only be evaluated in the first use. This feature is considered particularly useful for loading modules with a expensive or specific initialization of the platform. You can also improve starting performance by deferring the evaluation of the module for application characteristics until they are really necessary.

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