esbuild

Building for production takes ~10 minutes, and svelte-check adds another ~10 minutes, making it 20+ minutes total. esbuild, swc, and rspack lack good Svelte support, making workarounds difficult. Build times worsen as projects grow.

Vite's reliance on Rollup for production builds is slower than native alternatives like esbuild or Bun, creating a performance gap between dev (esbuild) and prod (Rollup) experiences.

Vite relies on multiple third-party dependencies with overlapping duties (esbuild, Rollup, SWC) that are written in different languages, creating efficiency problems when passing data between tools and introducing inconsistent behavior.

TypeScript adds a compilation step to the development workflow that can take seconds or minutes in large projects, slowing down the development cycle. While modern tools like esbuild, swc, and Vite help reduce build times, this overhead remains a consideration for project setup.

Developers starting new browser-based projects in 2025 sometimes default to CommonJS (`require()`) and heavy webpack configurations despite native ESM working everywhere that matters. This creates unnecessary migration burden and uses legacy tooling patterns.

The JavaScript ecosystem offers excessive choice in tools for parsing, transforming, testing, linting, and formatting at every layer, creating significant decision fatigue especially for developers new to JavaScript development.