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Projects like Vite need to load config files provided by the user, but you can't do it with just require() because it's not necessarily a CommonJS module, it could also be a .mjs or even be written in TypeScript, and that's where the bundle-require package comes in, it loads the config file regardless what module format it is.

• Bundle your file with esbuild, node_modules are excluded because it's problematic to try to bundle it
  • __filename, __dirname and import.meta.url are replaced with source file's value instead of the one from the temporary output file
• Output file in esm format if possible (for .ts, .js input files)
• Load output file with import() if possible
• Return the loaded module and its dependencies (imported files)

npm i bundle-require esbuild

esbuild is a peer dependency.

import { bundleRequire } from 'bundle-require'

const { mod } = await bundleRequire({
  filepath: './project/vite.config.ts',
})

https://www.jsdocs.io/package/bundle-require

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