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TypeScript

@typescriptlang.org

TypeScript is JavaScript with types and type-checking. Compiles down to JavaScript, runs where JavaScript runs.

TypeScript @typescriptlang.org · 08/07/2026

The 10x is real for many projects, and the speed improvements make a huge difference for teams at scale. TypeScript 7 drops time in CI, and minimizes delays in editors like VS & VS Code. That makes every part of the developer inner loop feel snappy.

Speedups of various projects between TypeScript 6 and 7

vscode 125.7s to 10.6s -- 11.9x
sentry 139.8s to 15.7s -- 8.9x
bluesky 24.3s to 2.8s -- 8.7x
playwright 12.8s to 1.47s -- 8.7x
tldraw 11.2s to 1.46s -- 7.7x

Memory usage of various projects between TypeScript 6 and 7

vscode 5.2GB to 4.2GB -- -18%
sentry 4.9GB to 4.6GB -- -6%
bluesky 1.8GB to 1.3GB -- -26%
playwright 1.GB to 0.9GB -- -11%
tldraw 0.6GB to 0.5GB -- -15%

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TypeScript @typescriptlang.org · 19/05/2026

Something subtle from @vscode.dev's recent release notes: VS Code core, and all its built-in extensions, are now type-checked with TypeScript 7 native previews! code.visualstudio.com/updates/v1_1...

From the VS Code 1.119 blog post:

Typechecking now uses TypeScript 7 for faster development iteration

Last iteration we moved VS Code's main watch task to use TypeScript 7. This iteration, we finished the migration to use TypeScript 7 for all built-in extensions and core code.

By migrating the Copilot extension to use TypeScript 7, we cut the typechecking time from 22 seconds to 4 seconds. These dramatic speedups enable both developers and agents to iterate more quickly in the VS Code codebase.

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