The answer
Because it stops the dev server from being a black box. When build errors appear, knowing the steps of entry, graph, transform, bundle, and serve gives you a mental model to debug them instead of guessing.
How Parcel Bundles a React App Behind the Scenes
Why should I understand how Parcel works?
More FAQs in How Parcel Bundles a React App Behind the Scenes
Parcel reads your entry file, builds a dependency graph by following imports, transforms JSX and modern syntax, bundles everything into output files, and serves them on a local port with hot reload on file changes.
It starts at an entry file and follows every import statement, finding each file or package and recursing into that file's imports. This produces a graph covering everything your app depends on.
Parcel runs JSX through a transformer, usually Babel, that compiles JSX into React.createElement calls. The browser never sees JSX; it sees regular JavaScript that React can execute.
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