TypeScript 6.0 isolatedDeclarations Cuts Build Times by Parallelising Declaration Emit

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TypeScript 6.0 introduces the isolatedDeclarations feature, which removes the type checker as a dependency during declaration file (.d.ts) generation. Instead of analysing cross-file import chains, the compiler now derives declarations purely from explicit type annotations in each source file, allowing parallel processing. This change can reduce large monorepo build times from several minutes to milliseconds, since each file emits its declarations independently. The tradeoff is stricter code requirements: all exported functions, classes, and variables must carry explicit type annotations, and previously implicit types will surface as hard errors. The feature also makes faster transpilers like esbuild and swc viable for full declaration file workflows, broadening TypeScript's integration options.

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