![]() tsbuildinfo file that can be used to speed up subsequent calls to tsc. This option saves a bunch of information to a. ![]() TypeScript 3.4 introduced a new -incremental compiler option. If you haven’t upgraded to TypeScript 3.4 due to these regressions, we would value your feedback to see whether TypeScript 3.5 addresses your performance concerns! -incremental improvements Not only have compile times fallen compared to 3.4, but code completion and any other editor operations should be much snappier too. Over this past release, we focused heavily on optimizing certain code paths and stripping down certain functionality to the point where TypeScript 3.5 is actually faster than TypeScript 3.3 for many incremental checks. This regression was serious not just because it led to much higher build times for TypeScript code, but because editor operations for both TypeScript and JavaScript users became unbearably slow. The most-impacted set of users were those using the styled-components library. Unfortunately, as part of a bug fix in TypeScript 3.4 we accidentally introduced a regression that could lead to an explosion in how much work the type-checker did, and in turn, type-checking time. Much of the expressivity of our type system comes with a cost – any more work that we expect the compiler to do translates to longer compile times. TypeScript 3.5 introduces several optimizations around type-checking and incremental builds. Higher order type inference from generic constructors.Improved excess property checks in union types.Support for other editors will likely be rolling in in the near future. Using tonight’s Visual Studio Code Insiders (or by manually setting the editor up).Downloading for Visual Studio 20 (for version 15.2 or later).To get started with TypeScript, you can get it through NuGet, or through npm with the following command: js files, TypeScript powers that experience, so you might already be using TypeScript! If you’ve used editors like Visual Studio or Visual Studio Code with. TypeScript also provides that same tooling for JavaScript users, and can even type-check JavaScript code typed with JSDoc using the checkJs flag. All of this is cross-platform, cross-editor, and open source. Built on top of all this is also a language service which uses all the type information TypeScript has to provide powerful editor functionality like code completions, find-all-references, quick fixes, and refactorings. The compiler strips out any TypeScript-specific syntax and optionally transforms your code to work with older browsers, leaving you with clean, readable JavaScript that can run in your favorite browser or Node.js. TypeScript code gets type-checked to avoid common mistakes like typos and accidental coercions, and then gets transformed by a program called the TypeScript compiler. If you’re new to TypeScript, it’s a language that builds on JavaScript that adds optional static types. Today we’re happy to announce the availability of TypeScript 3.5! ![]()
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