vite-plugin-react-pages/src/node/virtual-module-plugins/theme.ts

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import fs from 'fs-extra'
import * as path from 'path'
import slash from 'slash'

export async function resolveTheme(pagesDirPath: string) {
  for (let filename of ['_theme.js', '_theme.ts', '_theme.jsx', '_theme.tsx']) {
    filename = path.join(pagesDirPath, filename)
    if (await fs.pathExists(filename)) {
      return slash(filename)
    }
  }
  throw new Error("can't find theme inside pagesDir: " + pagesDirPath)
}