[armandabric]

Enables isolatedDeclarations in tsconfig.json.

Why

When isolatedDeclarations is on, tsdown (through rolldown-plugin-dts) generates dist/index.d.ts with Oxc instead of TypeScript. The build then no longer depends on the TypeScript API or on the tsgo binary:

• no more "TypeScript 7.0 does not yet have a stable API" warning after chore: Upgrade TypeScript to 7.0 and enable isolatedDeclarations #990;
• TypeScript 7.1+ upgrades won't break the build (rolldown-plugin-dts only supports ~7.0.0 for now);
• faster declaration generation.

tsc still enforces the rule, so code that Oxc can't handle is reported by pnpm run typecheck and in the editor.

Changes

• createPropFilter: explicit return type.
• defaultOptions: typed as Options.
• tsdown.config.ts / vitest.config.ts: the default export is a typed constant, because these files are part of the tsconfig and isolatedDeclarations can't infer default exports.

dist/index.js and dist/index.d.ts are byte-identical to the current build.

Independent of #990: this works with TypeScript 6 and 7.

Checks

• pnpm run typecheck
• pnpm run test (215 tests)
• pnpm run build (attw and publint pass, declarations generated by Oxc)
• pnpm run lint / pnpm run format

🤖 Generated with Claude Code

[github-actions]

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[codacy-production]

Up to standards ✅

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[armandabric]

Moved into #990.