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Announcing TypeScript 4.0 RC

What’s in store for the next major version of TypeScript.

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Announcing TypeScript 4.0

A major release for application-scale JavaScript development.

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Now with smarter control flow analysis, speed improvements, and more.

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Promise improvements with the Awaited Type, --module es2022, and more.

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Could we have types in JavaScript? Maybe!

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ECMAScript module support in Node.js, more powerful conditional types, and so on.

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New ‘satisfies’ operator, improved ‘in’ operator narrowing, and more.

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New ‘satisfies’ operator, improved narrowing with ‘in’, and more.

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Smaller, simpler, faster, and many new features such as ECMAScript decorators.

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Simplified configuration, expanded JSDoc functionality, decorators, and more.

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Decorator metadata, DisposableStack, ‘using’ declarations, and more.

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The typed JavaScript language brings exciting new features.