Windows 10: Announcing TypeScript 3.3 Release Candidate

Brink · Jan 24, 2019

Today we’re happy to announce the availability of our release candidate (RC) of TypeScript 3.3. Our hope is to collect feedback and early issues to ensure our final release is simple to pick up and use right away.

To get started using the RC, you can get it through NuGet, or use npm with the following command:

npm install -g typescript@rc

You can also get editor support by

Downloading for Visual Studio 2017 (for version 15.2 or later)

Following directions for Visual Studio Code and Sublime Text.

TypeScript 3.3 should be a smooth release to adopt, and contains no breaking changes. Let’s explore what’s new in 3.3...
Click to expand...

Read more: Announcing TypeScript 3.3 RC | TypeScript

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Brink · Dec 5, 2019

Announcing TypeScript 3.3 Release Candidate

Today we’re happy to announce the availability of our release candidate (RC) of TypeScript 3.3. Our hope is to collect feedback and early issues to ensure our final release is simple to pick up and use right away.

To get started using the RC, you can get it through NuGet, or use npm with the following command:

npm install -g L: [email protected]

You can also get editor support by

Downloading for Visual Studio 2017 (for version 15.2 or later)

Following directions for Visual Studio Code and Sublime Text.

TypeScript 3.3 should be a smooth release to adopt, and contains no breaking changes. Let’s explore what’s new in 3.3...
Click to expand...

Read more: Announcing TypeScript 3.3 RC | TypeScript

Brink · Dec 5, 2019

Announcing TypeScript 3.3 Release Candidate

Today we’re happy to announce the availability of our release candidate (RC) of TypeScript 3.3. Our hope is to collect feedback and early issues to ensure our final release is simple to pick up and use right away.

To get started using the RC, you can get it through NuGet, or use npm with the following command:

npm install -g typescript@rc

You can also get editor support by

Downloading for Visual Studio 2017 (for version 15.2 or later)

Following directions for Visual Studio Code and Sublime Text.

TypeScript 3.3 should be a smooth release to adopt, and contains no breaking changes. Let’s explore what’s new in 3.3...
Click to expand...

Read more: Announcing TypeScript 3.3 RC | TypeScript

Brink · Dec 5, 2019

Announcing TypeScript 3.0

TypeScript 3.0 is here! Today marks a new milestone in the TypeScript journey, serving JavaScript users everywhere.

If you’re unfamiliar with TypeScript, it’s not too late to learn about it now! TypeScript is an extension of JavaScript that aims to bring static types to modern JavaScript. The TypeScript compiler reads in TypeScript code, which has things like type declarations and type annotations, and emits clean readable JavaScript with those constructs transformed and removed. That code runs in any ECMAScript runtime like your favorite browsers and Node.js. At its core, this experience means analyzing your code to catch things like bugs and typos before your users run into them; but it brings more than that. Thanks to all that information and analysis TypeScript can provide a better authoring experience, providing code completion and navigation features like Find all References, Go to Definition, and Rename in your favorite editor.

To get started with the language itself, check out typescriptlang.org to learn more. And if you want to try TypeScript 3.0 out now, you can get it through NuGet or via npm by running

npm install -g typescript

You can also get editor support for

Visual Studio 2017 (for version 15.2 or later).

Visual Studio 2015 (which requires update 3).

For Visual Studio Code by installing the Insiders release until the full release provides it.

Sublime Text 3 via PackageControl.

Other editors may have different update schedules, but should all have excellent TypeScript support soon as well.

The 3.0 Journey

When we released TypeScript 2.0, we took a brief look back at how each release leading up to TypeScript 2.0 brought the language to where it is today. Between TypeScript 1.0 and up until 2.0, the language added union types, type guards, modern ECMAScript support, type aliases, JSX support, literal types, and polymorphic this types. If we include TypeScript 2.0 with its introduction of non-nullable types, control flow analysis, tagged union support, this-types, and a simplified model around .d.ts file acquisition, that era truly defined the fundamentals of using TypeScript.

So what have we done since? What, apart from new ECMAScript features like the long-await-ed async/await, generators, and object rest/spread brought us to TypeScript 3.0?

TypeScript 2.1 was a foundational release that introduced a static model for metaprogramming in JavaScript. The key query (keyof), indexed access (T[K]), and mapped object ({ [K in keyof T]: T[K] }) types have been instrumental in better modeling libraries like React, Ember, Lodash, and more.

TypeScript 2.2 and 2.3 brought support for mixin patterns, the non-primitive object type, and generic defaults, used by a number of projects like Angular Material and Polymer. TypeScript 2.3 also shipped a feature for fine-grained control of thistypes that allowed TypeScript to work well with libraries like Vue, and added the checkJs flag to enable type-checking on JavaScript files.

TypeScript 2.4 and 2.6 tightened up the story for strict checking on function types, addressing some of the longest-standing feedback about our type system through --strictFunctionTypes which enforced contravariance on parameters. 2.7 continued the trend of strictness with --strictPropertyInitialization checks in classes.

TypeScript 2.8 introduced conditional types, a powerful tool for statically expressing decisions based on types, and 2.9 generalized keyof and provided easier imports for types.

Which brings us to TypeScript 3.0! Despite the new big number, 3.0 has few breaking changes (meaning it should be veryeasy to upgrade) and introduces a new flexible and scalable way to structure your projects, powerful new support for operating on parameter lists, new types to enforce explicit checks, better JSX support, an overall better error UX, and much more!

What’s New?

Project references

--build mode

Controlling output structure

Further work

Extracting and spreading parameter lists with tuples

Richer tuple types

The unknown type

Improved errors and UX

Related error spans

Improved messages and elaboration

Support for defaultProps in JSX

/// <reference lib="..." /> directives

Editor Productivity

Named import refactorings

Closing JSX tag completions and outlining spans

Quick fixes for unreachable code and unused labels

Breaking changes

unknown is a reserved type name

API breaking changes

Click to expand...

Read more: Announcing TypeScript 3.0 | TypeScript

Windows 10: Announcing TypeScript 3.3 Release Candidate

Announcing TypeScript 3.3 Release Candidate

Announcing TypeScript 3.3 Release Candidate

Announcing TypeScript 3.3 Release Candidate

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