try {
  const ts = require('typescript')
  const extname = require('path').extname

  // previously next-server/tsconfig.json
  const config = {
    compilerOptions: {
      strict: true,
      module: 'esnext',
      target: 'ES2017',
      esModuleInterop: true,
      moduleResolution: 'node',
      jsx: 'react',
    },
    exclude: ['./dist/**', './*.d.ts', './constants.d.ts'],
  }

  module.exports = function(task) {
    // eslint-disable-next-line require-yield
    task.plugin('typescript', { every: true }, function*(file, options) {
      const opts = {
        fileName: file.base,
        compilerOptions: {
          ...config.compilerOptions,
          ...options,
        },
      }

      const ext = extname(file.base)

      // Include declaration files as they are
      if (file.base.endsWith('.d.ts')) return

      // For example files without an extension don't have to be rewritten
      if (ext) {
        // Replace `.ts` with `.js`
        const extRegex = new RegExp(ext.replace('.', '\\.') + '$', 'i')
        file.base = file.base.replace(extRegex, '.js')
      }

      // compile output
      const result = ts.transpileModule(file.data.toString(), opts)

      if (opts.compilerOptions.sourceMap && result.sourceMapText) {
        // add sourcemap to `files` array
        this._.files.push({
          dir: file.dir,
          base: `${file.base}.map`,
          data: Buffer.from(JSON.stringify(result.sourceMapText), 'utf8'),
        })
      }

      // update file's data
      file.data = Buffer.from(
        result.outputText.replace(
          /process\.env\.__NEXT_VERSION/g,
          `"${require('./package.json').version}"`
        ),
        'utf8'
      )
    })
  }
} catch (err) {
  console.error(err)
}