jest-vue/lib/compilers/babel-compiler.js

Jest Vue transform

const babel = require('babel-core')
const findBabelConfig = require('find-babel-config')
const logger = require('../logger')
const cache = require('../cache')

var defaultBabelOptions = {
  presets: [require.resolve('babel-preset-vue-app')]
}

function getBabelConfig () {
  const cachedConfig = cache.get('babel-config')
  if (cachedConfig) {
    return cachedConfig
  } else {
    const { file, config } = findBabelConfig.sync(process.cwd(), 0)
    if (!file) {
      logger.info('no .babelrc found, defaulting to default babel options')
    }
    const babelConfig = file ? config : defaultBabelOptions
    cache.set('babel-config', babelConfig)
    return babelConfig
  }
}

module.exports = function compileBabel (scriptContent, inputSourceMap) {
  const sourceMapOptions = {
    sourceMaps: true,
    inputSourceMap: inputSourceMap
  }

  const babelConfig = getBabelConfig()

  const babelOptions = Object.assign(sourceMapOptions, babelConfig)

  const res = babel.transform(scriptContent, babelOptions)

  return {
    code: res.code,
    sourceMap: res.map
  }
}