TypeScript

@typescriptlang.org

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

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
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.