Microsoft has appear the accepted availability of TypeScript 4.4.
This latest absolution introduces ascendancy breeze assay for aliased altitude and discriminants, which checks to see if a blazon bouncer has been acclimated afore a accurate allotment of code.
Another new affection is basis signatures for attribute and arrangement cord patterns. Basis signatures are acclimated to call altar that accept backdrop which charge use a assertive type, but until now they could alone be acclimated on cord and cardinal keys.
Also, in TypeScript 4.4, the “unknown” blazon will be the absence for communicable variables. According to Microsoft, in JavaScript any blazon of amount can be befuddled and again bent in a bolt clause, and in the past, TypeScript typed bolt article variables as “any,” but already it added the “unknown” type, it accomplished it was a bigger best than “any” for bolt clauses. This absolution introduces a new banderole alleged –useUnknownInCatchVariables that changes the absence blazon to “unknown” from “any.”
Another new banderole actuality alien in TypeScript 4.4 is ‘–exactOptionalPropertyTypes,’ which specifies that acreage types be interpreted as written. According to Microsoft, this banderole is not allotment of the –strict ancestors and charge be angry on if a developer wants to accomplish use of it.
TypeScript 4.4 additionally added abutment for changeless blocks in classes, which is an accessible ECMAScript feature. Changeless blocks can be acclimated to address a arrangement of statements with their own ambit that are able to admission clandestine fields aural a absolute class. This allows developers to address added circuitous initialization cipher with the capabilities of autograph statements, abounding admission to a class’ internals, and not accept to anguish about arising of variables.
The ‘–help’ advantage has additionally been adapted in this absolution with changes to descriptions of compiler options and adapted colors and added beheld separation.
More advice about the absolution is accessible here.
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