rollupconfigjs

rollupconfigjs refers to the configuration file used by Rollup, a JavaScript module bundler. This file, typically named rollup.config.js, dictates how Rollup processes and bundles JavaScript modules. It's a standard JavaScript file that exports a configuration object or an array of configuration objects.

Within the configuration, developers specify various options that control the bundling process. Key options include the input file(s) to be bundled, the output format (e.g., CommonJS, ES Module, UMD), and the destination file path. Plugins are a crucial part of Rollup configuration, allowing for extensibility. These plugins can perform tasks like transpiling code with Babel, minifying the output with Terser, or handling different file types like CSS or images.

The configuration object can also define external dependencies, preventing them from being bundled into the output. This is common for libraries that are expected to be available in the global scope or managed by a package manager. Advanced configurations can include code splitting, tree shaking optimization, and sourcemap generation. The flexibility of rollup.config.js makes Rollup a powerful tool for building efficient and optimized JavaScript applications and libraries.