naive-ui/build/utils/terse-cssr.js

const parser = require('@babel/parser')
const { default: traverse } = require('@babel/traverse')
const { default: generate } = require('@babel/generator')

module.exports = function terseCssr (code) {
  if (process.env.NODE_ENV === 'production') {
    const pattern = /[\n\t\s]+/g

    const ast = parser.parse(code, {
      sourceType: 'module'
    })

    traverse(ast, {
      TemplateElement (path) {
        ;['raw', 'cooked'].forEach((type) => {
          path.node.value[type] = path.node.value[type].replace(pattern, '')
        })
      }
    })

    return generate(ast).code
  }
  return code
}