chore: Update to use tsdown for build system#2824
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Summary
• Migrate the build system from Rollup + Babel to tsdown across all packages, simplifying configuration and reducing dependencies
Details
This PR replaces the existing Rollup and Babel build configuration with tsdown, a modern TypeScript-first bundler built on top of Rolldown.
Changes:
• Remove Rollup config files (rollup.config.js, rollup.dts.config.js) from all packages
• Remove Babel config files (babel.config.mjs) from all packages
• Remove package-level tsconfig.declaration.json files
• Add tsdown.config.ts to each package with equivalent build configuration
• Add shared tsdown.base.ts for common configuration
• Remove rollup.base.config.js from root
• Update package.json scripts and dependencies accordingly
Affected packages:
• docsearch-core
• docsearch-js
• docsearch-modal
• docsearch-react
• docsearch-sidepanel
• docsearch-sidepanel-js
Benefits:
• Simplified build configuration (single tool instead of Rollup + Babel + plugins)
• Reduced dependency footprint (-1,355 lines in yarn.lock, +476 lines = net reduction of ~879 lines)
• Modern TypeScript-native tooling with better DX
• Faster build times (Rolldown is Rust-based)