![]() Putting these declarations in the same scope is typically a win simply because it avoids adding boilerplate code to simulate scopes in a single file – lots of those scope setups and teardowns can be completely eliminated. The Categories area displays the total blog posts. Instead, TypeScript leveraged namespaces – formerly called internal modules.įor example, their scopes could merge across files, meaning it was easy to break up a project across files and expose it cleanly as a single variable. Folio navigation displays the modules at the top of the folio. We didn’t know how (in)compatible they’d be with other module systems like CommonJS, and to be frank, there wasn’t a huge benefit for us at the time for authoring in modules. Isn’t almost all modern JavaScript and TypeScript using modules?īut the current TypeScript codebase predates ECMAScript’s modules – our last rewrite started in 2014, and modules were standardized in 2015. Now that might sound surprising – modules? ![]() If you’re importing protocol.d.ts, you can switch to tsserverlibrary.d.ts and leverage ts.server.protocol.įinally, as a contributor of TypeScript, your life will likely become a lot easier.īuild times will be a lot faster, incremental check times should be faster, and you’ll have a more familiar authoring format if you already write TypeScript code outside of our compiler. ![]() If you rely on TypeScript’s typescriptServices.js and typescriptServices.d.ts files, you’ll be able to rely on typescript.js/ typescript.d.ts instead. That means existing build scripts will still work. TypeScript won’t be shipping its API as ES modules yet, and will still provide a CommonJS-authored API. Running TypeScript will get a nice bit faster – typically cutting down build times of anywhere between 10%-25%.Īs an API consumer of TypeScript, you’ll likely be unaffected. Npm installs should go a little faster and take up less space, since the typescript package size should be reduced by about 46%. It’s good to know what this does and doesn’t mean for TypeScript 5.0.Īs a general user of TypeScript, you’ll need to be running Node.js 12 at a minimum. Now, before we dive in, we want to set expectations. In TypeScript 5.0, we restructured our entire codebase to use ECMAScript modules, and switched to a newer emit target. One of the most impactful things we’ve worked on in TypeScript 5.0 isn’t a feature, a bug fix, or a data structure optimization. ![]()
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