TypeScript 4.2.4 & 4.3-Beta releases, Microsoft Scripting Language
- TypeScript is a language for application-scale JavaScript. It adds optional types, classes, and modules to JavaScript. It supports tools for large-scale JavaScript applications for any browser, for any host, on any OS. It compiles to readable, standards-based JavaScript. It supports much the same types (numbers, strings, structures, boolean values, and the like) as you would expect in JavaScript, with a convenient enumeration type thrown in to help things along.
TypeScript starts from the same syntax and semantics that millions of JavaScript developers know today. Use existing JavaScript code, incorporate popular JavaScript libraries, and call TypeScript code from JavaScript.
It compiles to clean, simple JavaScript code which runs on any browser, in Node.js, or in any JavaScript engine that supports ECMAScript 3 (or newer).
Types enable JavaScript developers to use highly-productive development tools and practices like static checking and code refactoring when developing JavaScript applications.
Types are optional, and type inference allows a few type annotations to make a big difference to the static verification of your code. Types let you define interfaces between software components and gain insights into the behavior of existing JavaScript libraries.
TypeScript offers support for the latest and evolving JavaScript features, including those from ECMAScript 2015 and future proposals, like async functions and decorators, to help build robust components.
These features are available at development time for high-confidence app development, but are compiled into simple JavaScript that targets ECMAScript 3 (or newer) environments.
Changelog
v4.2.4
For release notes, check out the release announcement.
For the complete list of fixed issues, check out the
v4.3-beta
- 618b518 Update LKG
- 7234457 Merge remote-tracking branch ‘origin/master’ into release-4.3
- 62f3ccd Error if assignment after block (#41115)
- 76a2ae3 Only issue matching token errors on non-dupe locations (#43460)
- 5b7838e Update package-lock.json
- d51b8cf Do not delete output file names that are same as input file name (#43448) [ #43116 ]
- 3dd68b8 Fix template literal type relations (#43440)
- 819651e fix(43313): add parentheses to a type assertions (#43315)
- a8ee22f “fix(services): convert to es6 module generate invalid code with .default” (#43309)
- 1625bfb Cherry-pick PR #43435 into release-4.3 (#43438)
