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Posts tagged “type-definitions”

2 posts found

TypeScript 6.0 isolatedDeclarations: What It Actually Replaces and Why It Matters

TypeScript 6.0 isolatedDeclarations: What It Actually Replaces and Why It Matters

July 5, 2026

TypeScript 6.0's isolatedDeclarations replaces the type checker bottleneck in .d.ts generation, enabling parallel builds and sub-second declaration emit in monorepos.

typescriptbuild-performancetype-definitions+2
TypeScript isolatedDeclarations Deep Dive: Parallel d.ts Emit and What Library Authors Must Change

TypeScript isolatedDeclarations Deep Dive: Parallel d.ts Emit and What Library Authors Must Change

June 16, 2026

The isolatedDeclarations flag unlocks parallel declaration emit but breaks type inference. Here's what library authors must change and why the performance gains matter for monorepos.

typescriptbuild-performancemonorepo+2