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Yes, esbuild is open source under MIT license. Completely free. No paid version.
esbuild is an extremely fast JavaScript bundler. Written in Go. 10-100x faster than webpack. Powers Vite's development mode.
esbuild is dramatically faster but has fewer features. webpack is mature with huge plugin ecosystem. esbuild for speed; webpack for complex builds.
Written in Go, not JavaScript. Heavy parallelization. Minimal passes over source code. Designed for speed from the start.
Source: esbuild.github.io