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TypeScript 1.5 Inches Nearer to ECMAScript 6

TypeScript 1.5, which has been in the hands of beta testers since the end of April, packs bug fixes and a few more features to get it ready to align with the upcoming ECMAScript 6.

A beta version of the TypeScript scripting language was released at the end of April that's said to have features that more closely align it with the standards being developed under the ECMAscript 6 scripting language.

Version 1.5 contains a number of "bug fixes, support for a new metadata API that works with decorators, and updates to bring lib.d.ts up-to-date," said Jonathan Turner, Microsoft program manager for the TypeScript team, in a separate blog post.

It was back in October last year that Turner blogged extensively on the roadmap for TypeScript 2.0, wherein the team would focus on two goals: "The first is to align with ES6." The second is "working with the Flow and Angular teams to make sure that TypeScript is the best language for working with a broader range of libraries, including declarative frameworks like the upcoming Angular 2.0 release." 

Besides bug fixes, what's new and of signficance in 1.5 is a "metadata API for working with decorators" that allows for "adding and reading metadata on declarations." In a comment to one developer, Turner clarified that the metadata API "is one that we are working on for possible standardization in ES7."

The lib.d.ts binary was updated, as well; updates can be seen on GitHub.

TypeScript 1.5 is in Visual Studio 2015 RC, as well as other sources.

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