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esbuild is a JavaScript/TypeScript/CSS bundler and minifier written in Go. It provides both a CLI and programmatic API for bundling web assets with features like tree shaking, minification, source maps, code splitting, and a development server. The architecture follows a layered design: CLI/API → parsing → dependency resolution → bundling → transformation → code generation. The tool is known for its exceptional performance, achieved through aggressive optimizations, parallel processing, and avoidance of unnecessary caching. It supports modern JavaScript/TypeScript features while being able to target older browsers through syntax lowering.
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