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TypeScript
@typescript
TypeScript is a language for application-scale JavaScript development. It's a typed superset of JavaScript that compiles to plain JavaScript.
Redmond, WAtypescriptlang.orgJoined September 2012
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313.4K Followers

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TypeScript
@typescript
TypeScript 5.1 is now out! Now with: - smarter checks for undefined-returning functions - no restrictions between getter/setter types - better checks against JSX tags - linked editing for JSX - @⁠param snippets - new speed-ups Read up more on our blog!
devblogs.microsoft.com
Announcing TypeScript 5.1 - TypeScript
Today we’re excited to announce the release of TypeScript 5.1! If you’re not yet familiar with TypeScript, it’s a language that builds on JavaScript by adding constructs called types. These types can...
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TypeScript
@typescript
Today the TypeScript team is releasing a new VS Code extension named Deopt Explorer! This tool can help find polymorphism and deoptimizations in your code, and it's already helped us speed up TypeScript itself. Check out what we've built!
devblogs.microsoft.com
Introducing Deopt Explorer - TypeScript
Over the past few months, during the lead-up to the TypeScript 5.0 beta, our team spent a good portion of our time looking for ways to improve the performance of our compiler so that your projects...
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@typescript
TypeScript 5.1 Beta is now available to try, with - smarter checks for undefined-returning functions - no restrictions between getter/setter types - customizable tag checks for JSX libraries - linked editing for JSX - @⁠param snippets and more!
devblogs.microsoft.com
Announcing TypeScript 5.1 Beta - TypeScript
Today we’re announcing our beta release of TypeScript 5.1! To get started using the beta, you can get it through NuGet, or through npm with the following command: npm install -D typescript@beta...
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@typescript
Modeled as throughput, TypeScript would be 25% faster, or 1.25x faster to compile VS Code. We chose to use proportion of time instead of increases in throughput since we felt it was a more straightforward calculation.
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@typescript
As a clarification on this chart - these are proportions of build times relative to TypeScript 4.9. So TypeScript 5.0 takes 80% of the time that TypeScript 4.9 took to build VS Code - a reduction of 20%.
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Speaking of literal types - every enum member now acts kind of like a literal type. This is way safer, and pushes us to be tidy and consistent. 🤓
enum E { A = 42, } // still works let fine: E = 42; // ❌ now an error let oops: E = 43;
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@typescript
We're pretty sure you love coding with TypeScript - but just in *case*, we added a new feature to our code-completions. If you write a 'switch' statement and you're using literal types, we'll scaffold out all your 'case's automagically. 🪄
type Fruit = | { kind: "apple" } | { kind: "orange" } | { kind: "banana" } function nom(fruit: Fruit) { switch (fruit.kind) { // Completions here now include a snippet // which fills in cases for the strings "apple", "orange", and "banana". } }
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Does your linter fight with your editor? We're lovers, not fighters. Let's all get along. ☮️✌️ TypeScript 5.0 is smarter about respecting upper/lower-casing in already-sorted imports.
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If you're a library author, maybe you've told your users to write 'as const' when they call a function. With 'const' type parameters, you can hint which values should get literal & read-only types.
declare function frozen<const T>(x: T): T; // inferred type is 'readonly ["elsa", "anna", "olaf"]' let itSnow = frozen([ "elsa", "anna", "olaf" ]);
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TypeScript 5.0 brings '--moduleResolution bundler' to model how most modern bundlers and loaders work. It understands classic Node-style resolution while respecting rules for 'exports', 'imports', etc. in your dependencies.
To model how bundlers work, TypeScript now introduces a new strategy: `--moduleResolution bundler`. ``` { "compilerOptions": { "target": "esnext", "moduleResolution": "bundler" } } ``` If you are using a modern bundler like Vite, esbuild, swc, Webpack, Parcel, and others that implement a hybrid lookup strategy, the new `bundler` option should be a good fit for you.
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@typescript
If you thought TypeScript 4.9 was a satisfying release... 5.0 will do it again by bringing support for /** @⁠satisfies */ to checked JavaScript files! Works the same as our recent 'satisfies' operator in TypeScript files.
/** * @satisfies {Record<string, (e: Event) => void>} */ export let eventHandlers = { // type of 'e' is inferred as 'Event' click: (e) => { e.preventDefault(); }, scroll: (e) => { }, }; // ✅ works eventHandlers.click(new Event("click")); // ❌ error eventHandlers.clock(new Event("click"));
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Ever gotten into an argument about decorating? Now you can decorate without any red flags. 🚩🚩🚩🚩 TypeScript 5.0 ships the latest version of decorators! ✨ Use them without setting --experimentalDecorators 🧪.
class Greeter { message: string; constructor(message: string) { this.message = message; } @bound greet() { console.log(this.message); } } const greeter = new Greeter("sup?"); const greet = greeter.greet; greet();
/** * Ensures a method is bound to every instance. */ function bound(method: Function, context: ClassMethodDecoratorContext<any>) { if (context.private) { throw new Error("Cannot bind private methods."); } context.addInitializer(function (this) { this[context.name] = method.bind(this); }); }
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We'll make this one fast: TypeScript's now way speedier. You can expect at anywhere from 10%-20% of your compile times to disappear with TypeScript 5.0!
Chart of build/run times TypeScript 5.0 relative to TypeScript 4.9: material-ui docs build time: 90% Playwright build time: 88% tsc startup time: 87% tsc build time: 87% Outlook Web build time: 82% VS Code build time: 80%
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Want to know what's new in TypeScript 5.0 at a glance? Here's a thread about what's packed into this release that makes it great. 🧵
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TypeScript
@typescript
TypeScript 5.0 is here! 🎉🎉 Learn about what's new and try it today! devblogs.microsoft.com/typescript/ann
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Our Release Candidate for TypeScript 5.0 is out now! Try our new decorators, better modes for modules in Node & bundlers, new inference tools for library authors, new JSDoc tags, and some nice speedups! Help us shape the 5.0 release to be perfect!
devblogs.microsoft.com
Announcing TypeScript 5.0 RC - TypeScript
Today we’re excited to announce our Release Candidate of TypeScript 5.0! Between now and the stable release of TypeScript 5.0, we expect no further changes apart from critical bug fixes. This release...
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TypeScript
@typescript
TypeScript 5.0 Beta is now out to try! 🚀 Now with ES decorators, better modes for modules in Node & bundlers, new inference tools for library authors, JSDoc support - and last but not least, some great speed and size improvements!
devblogs.microsoft.com
Announcing TypeScript 5.0 Beta - TypeScript
Today we’re excited to announce our beta release of TypeScript 5.0! This release brings many new features, while aiming to make TypeScript, smaller, simpler, and faster. We’ve implemented the new...
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TypeScript
@typescript
TypeScript 4.9 has landed, and it's a release that's guaranteed to satisfy! Now bringing ✅ A new 'satisfies' operator ✅ Improved narrowing with 'in' ✅ More efficient file-watching ✅ Better tools import clean-up and more! Read up now!
devblogs.microsoft.com
Announcing TypeScript 4.9 - TypeScript
Today we are excited to announce the availability of TypeScript 4.9! If you’re not familiar with TypeScript, it’s a language that builds on JavaScript by adding types and type-checking. Types can...
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TypeScript
@typescript
TypeScript 4.8 is here! Now with ✅ Improved narrowing and inference ✅ Primitive-parsing from template string types ✅ --incremental/--watch perf improvements ✅ Lots of new correctness checks and more! Read up and get it now!
devblogs.microsoft.com
Announcing TypeScript 4.8 - TypeScript
Today we’re excited to announce the release of TypeScript 4.8! If you’re not yet familiar with TypeScript, it’s a language that builds on JavaScript and adds syntax for types. These types let you put...
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TypeScript
@typescript
TypeScript 4.7 is now out, bringing ✅ Support for ES modules in Node.js ✅ Improved inference and narrowing ✅ More powerful conditional types ✅ Go to Source Definition ✅ Smarter Organize Imports and more! Try it out today!
devblogs.microsoft.com
Announcing TypeScript 4.7 - TypeScript
Today we’re excited to announce the availability of TypeScript 4.7! If you’re not yet familiar with TypeScript, it’s a language that builds on JavaScript and adds syntax for types. Types help...
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TypeScript
@typescript
The Types as Comments proposal means that browsers could run TypeScript-checked code directly, (even though they wouldn't do any type-checking). That means faster iteration with all the type-checking and editing experience you know and love today.
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